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<h1>Autonomic systems</h1>
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<p class="nav"><span class="nav-left">Listed under <a href="/ray-peat.html">Ray Peat</a>.</span><span class="nav-right"><a href="/theme.html">Theme</a></span></p>
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<p>From the <a href="https://raypeat.com/articles/other/autonomic-systems.shtml" target="_blank">original article</a> in 2006. Author: <a href="https://raypeat.com/" target="_blank">Ray Peat</a>.</p>
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<p><em>Historically,
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functions such as reason, emotion, and instinct were associated with
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particular nervous structures, and there was a reluctance to think that
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consciousness, like instinct, could be based on "reflexes." Eventually,
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this led to the idea of an autonomous nervous system which produced
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emotions and adjusted the body's functions, while the "central nervous
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system" was the seat of conscious thought, perception, and behavior.</p>
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<p>Our individual
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cells have a degree of autonomy, consisting of the ability to sense
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their situation, integrate stimuli, and act adaptively. Their behavior
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is intelligently adaptive. The cells that make up the nervous system
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have this basic capacity for complex adaptive integration, but they
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also have the specialized role of serving as links between cells, and
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between cells and the environment. </p>
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<p>The integration
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of the organism is most complete when the energy of each cell is optimal.
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The "autonomic nervous system," including nerves that are closely
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associated with the diverse organs and tissues, is easiest to understand
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as a system for integrating and optimizing energy throughout the organism.</p>
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<p>This view
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suggests new ways of understanding imbalance in these nervous functions,
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and the diseases that develop under the imbalanced conditions--e.g.,
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asthma, polycystic ovaries, menopausal symptoms, some skin diseases,
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multiple sclerosis, heart disease, and tumors.</p>
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<p>Every organ
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has its own intrinsic nerve net, and the cortex of the brain adjusts
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each system to meet the adaptive needs of the organism.</p>
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<p>When every
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cell is functioning optimally, and the organism is adapted to its environment,
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there is little need for intervention by the "transmitter substances."</em> </p>
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<p>
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<p>
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People
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like Walter Cannon and Wilhelm Reich popularized the idea of the autonomic
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nervous system, but they were just systematizing ideas that had been
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developing since the beginning of the century. Their views were the
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context in which Selye’s idea of stress developed.</p>
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<p>The
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anatomical components of the nervous system that were called the sympathetic
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(“fight or flight,” adrenergic) system and the parasympathetic (“vegetative”)
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system are still important factors in physiological thinking, and despite
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the great complexity that has grown up around them, there is still a
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tendency to identify the systems with polarities of mood or emotion.
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The idea of polarities is useful, but it easily leads to error.</p>
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<p>(The
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sympathetic system includes a chain of ganglia along the spine, and
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its functions include dilating the pupils and accelerating the heart.
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The parasympathetic system is also called the cranio-sacral system,
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from the location of its ganglia, and among its functions are slowing
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the heart and constricting the pupils. However, despite several decades
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of research, the actions of “sympathetic” and “parasympathetic”
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nerves in most organs aren’t understood.)</p>
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<p>If
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the “adrenaline side” of the nervous system is responsible for the
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reactions to pain and threat, reactions of fear and rage, then the opposite
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side tends to be given attributes such as peace and pleasure, and the
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fact that these oppositions are often true has led to a climate in which
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the adrenergic reactions are seen as “bad,” and the opposite reactions
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as “good.” When adrenalin was identified as an agent of the sympathetic
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nervous system, there was a search for the “opposing” agent of the
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parasympathetic system. Histamine was an early candidate, before acetylcholine
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was discovered to be the main parasympathetic agent. This view of histamine
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was fostered by the older idea of “trophic nerves,” which easily
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became identified with the parasympathetic system. When acetylcholine
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was identified as the transmitter or agent of the parasympathetic system,
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it tended to take on many of the qualities, including the “trophic”
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functions, that had grown up around the idea of the parasympathetic
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system, but the emphasis on acetylcholine led to a general neglect of
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the associations of histamine, and the mast cells that produce much
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of it, with the autonomic nervous system. (The current trend seems to
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be emphasizing a close integration of mast cell function with nervous
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function.) Nitric oxide has recently been identified as another
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parasympathetic “transmitter.” Nitric oxide and histamine are both
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very important factors in degenerative inflammatory diseases, but their
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association with the parasympathetic nervous system has given them an
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aura of benevolence.</p>
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<p>I
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think it’s useful to compare the autonomic nervous system with the
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pituitary, not just because some of the pituitary hormones are called
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“trophic” hormones (e.g., luteotrophic, adrenocorticotrophic), but
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because their important adaptive functions can themselves be the cause
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of serious problems. An excess of the thyroid stimulating hormone, for
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example, causes degeneration and cancer development in the thyroid gland,
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and animals deprived of their pituitary gland, but given thyroid, live
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longer than intact animals. </p>
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<p>If
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slaves are starved and beaten frequently, they aren’t very productive,
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they don’t live long, and they might rebel. Workers that are healthy
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and working for a common goal that they understand are more productive.
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Cells that are well energized perform their functions with minimal cues,
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but deprived cells that have to be forced to function are likely to
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die unexpectedly, or to reproduce inappropriately, or to change their
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identity.</p>
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<p>Professors
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often make a strong impression on their students, but, especially in
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technical or scientific fields, they usually do this by controlling
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the discourse, so that radical questioning is excluded. What they don’t
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know “isn’t knowledge.” Under the pressure of “getting a professional
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education,” students appreciate organizing principles and mnemonic
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devices, but this gives traditional ways of systematizing knowledge
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tremendous power that, in practice, is far more important than mere
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experimental results. (Experiments that don’t acknowledge the ruling
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metaphors are almost universally considered inadmissable,
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unpublishable.)</p>
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<p>Some
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obvious questions about the autonomic system have been commonly ignored
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or minimized by physiologists. If “stress” is the stimulus that
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causes the sympathetic system to increase its activity, what is the
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stimulus for increased activity of the parasympathetic system? What
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accounts for the relative balance between the two sides of the system,
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or their imbalance? The fact that the answers aren’t obvious has left
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the questions largely to psychiatrists and psychologists. Wilhelm Reich,
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who tried to provide answers in terms of developmental interactions
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between the organism and its environment, found that the question led
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him to investigate psychosomatic disease, sexual repression, cancer,
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and fascism, with disastrous results for himself. </p>
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<p>Chinese
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medicine was familiar with many of the functions of the autonomic nervous
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system at a time when western medicine was organized around “the humors.”
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It’s easy for contemporary “western” people to see that the “winds”
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and the hot and cold principles of Chinese tradition are metaphors,
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but they are reluctant to see that their own system has grown up within
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very similar traditional metaphoric polarities.</p>
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<p>The
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successes of even a good metaphor can cause people to neglect details
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that could support a more complete and accurate image of reality.</p>
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<p>Contemporary
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science carries a load of bad metaphors, because the educational system
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doesn’t tolerate a critical attitude. Potentially, a good metaphor
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(e.g., Vernadsky’s suggestion that an organism is “a whirlwind of
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atoms”) could blow away many bad metaphors, but the present organization
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of science is tending in the other direction<strong>:</strong> Commercial interests
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are creating a culture in which their metaphors are replacing the traditional
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science in which there was a certain amount of honest intellectual exploration.
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</p>
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<p>In
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talking about consciousness, sleep, stress, biological rhythms, aging,
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and energy, I have often focussed on the efficient use of oxygen for
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energy production by the mitochondria, i.e., cellular respiration. Every
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situation demands a special kind of adaptation, and each kind of adaptation
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requires a special distribution of cellular and organic activity, with
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its supporting local respiratory activity.</p>
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<p>There
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is a lot of local self-regulation in the adapting organism, for example
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when the activated tissue produces increased amounts of carbon dioxide,
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which dilates blood vessels, delivering more oxygen and nutrients to
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the tissue. But the distribution of excitation, and the harmonious balancing
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of the organism’s resources and activities, is achieved by the actions
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of the cortex of the brain, acting on the subordinate nerve nets, adjusting
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many factors relating to energy production and use.</p>
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<p>On
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the level of the mitochondria, adrenaline and acetylcholine have slightly
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different effects. (Metabolic studies with isolated mitochondria are
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so remote from the normal cellular condition that their results are
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nothing more than a hint of what might be occurring in the cell.) Acetylcholine
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appears to shift the proportion of the fuels used (increasing the oxidation
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of alpha-ketoglutarate, with the production of carbon dioxide) and increasing
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the efficiency of energy conservation (phosphorylation, producing ATP)
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so that less oxygen is needed, while adrenaline increases the rate of
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oxygen consumption (and succinate oxidation). This would be consistent
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with F. Z. Meerson’s conception of the parasympathetic function as
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one of the “stress limiting” systems.</p>
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<p>On
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the level of the whole cell, organ, and organism, the parasympathetic
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function limits oxygen consumption in a variety of ways, including the
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reduction of blood flow. Acetylcholine, like histamine and serotonin,
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activates glycolysis, the conversion of glucose to lactic acid, which
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provides energy in the absence of oxygen. </p>
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<p>The
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effects of a little adrenaline, and a lot of adrenaline, are very different,
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with a high concentration of adrenaline decreasing the efficiency of
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phosphorylation. In the stressed heart, this effect of excess adrenaline
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can be fatal, especially when it is combined with adrenaline’s acceleration
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of clotting, liberation of fatty acids, and frequently of calcium, and
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constriction of blood vessels. </p>
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<p>Seventy
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years ago, autonomic control of blood vessels seemed to be a matter
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of nerve fibers that constrict them, and other fibers that cause them
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to dilate, but that idea hasn’t worked for a long time.</p>
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<p>Ever
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since I noticed that the students in our physiology lab who tried to
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use adrenaline to revive their rats weren’t successful, I have wondered
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about the television shows in which adrenaline is given to patients
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with heart problems. Under some conditions adrenaline does increase
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circulation to the heart, but extreme stress doesn’t seem to be among
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those conditions.</p>
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<p>Too
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much serotonin, histamine, acetylcholine, and polyunsaturated fatty
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acids, like too much adrenalin, can cause spasms of the coronary arteries,
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along with disturbances of mitochondrial respiration. In stress, these
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substances are almost sure to be present in excess. (Anti-serotonin
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drugs are effective for a variety of heart problems, and other degenerative
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diseases.)</p>
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<p>By
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increasing the production of lactic acid and the loss of carbon dioxide,
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exaggerated nervous stimulation (especially the excess of acetylcholine,
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histamine, and serotonin) can cause a variety of problems, including
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generalized vasoconstriction and systemic alkalosis, as well as increased
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intracellular alkalinity. This metabolic pattern is characteristic
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of many kinds of stress, including cancer. (Elsewhere, I have referred
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to this pattern as “relative hyperventilation.”) The metabolic effects
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probably account for some of the “paradoxical” effects of the autonomic
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agents.</p>
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<p>When
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nutrition and thyroid function, light, atmospheric pressure, and other
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conditions are favorable, the autonomic transmitters (e.g., acetylcholine,
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histamine, serotonin, adrenalin) and pituitary hormones and other “signal
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substances” are kept within safe limits.</p>
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<p>Because
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the substances released from various cells under the influence of the
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autonomic nerves (histamine and serotonin, for example) stimulate cell
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division, injuries which produce clots and vascular spasms will also
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stimulate the formation of new blood vessels, a process that is essential
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for the adaptation of tissues to prolonged stress.</p>
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<p>These
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stress-induced agents are appropriately included in the “vegetative”
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(parasympathetic) nervous system, because they promote vegetation, i.e.,
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the proliferation of substance.</p>
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<p>Adrenaline,
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and the sympathetic nerves, have the opposite function, of restraining
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cell division, and they also oppose the pro-inflammatory functions of
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those parasympathetic agents.</p>
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<p>Estrogen
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tends to shift autonomic balance toward the parasympathetic side, away
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from the sympathetic/adrenergic. Recalling that stress, hypothyroidism,
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and aging increase the activity of aromatase in various tissues, with
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local production of estrogen, and that tissue-bound estrogen stays at
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a high level in postmenopausal women despite the lower level of estrogen
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in the serum, it’s worthwhile looking at the effects of estrogen on
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the various components of the so-called autonomic nervous system.</p>
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<p>One
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injection of estrogen can induce a large increase in the number of sympathetic
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nerves in the ovaries. At menopause, a similar “invasion” of sympathetic
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nerves occurs. The polycystic ovary (which is even more common after
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menopause than before, and some studies have found the condition in
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20% of premenopausal women) responds to estrogen by producing nerve
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growth factor(s), and growing a large number of new sympathetic nerves.
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Although the hyperestrogenism associated with the polycystic ovary syndrome
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has many harmful effects, the invasion of the ovary by adrenergic nerves
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apparently protects it from the development of cancer. </p>
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<p>Parasympathetic
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nerves, pituitary hormones and mast cells activate the ovaries. The
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number of mast cells in the ovaries is increased by the pituitary hormones
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(including the thyroid stimulating hormone), and by estrogen (Jaiswal
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and Krishna, 1996). Estrogen is the most potent of these hormones in
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causing the cells to release histamine. The overgrowth of the sympathetic
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nerves in the polycystic
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ovary causes the number and activity of mast cells to decrease, possibly
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as a protective adaptation against excessive stimulation from the many
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pro-inflammatory factors. The mast cells are needed for the follicles
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to rupture, so their suppression prevents ovulation. </p>
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<p>The
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nervous system is closely involved in controlling the growth of tissues,
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and it has been argued (R.E. Kavetsky reviewed the subject in his book,
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emphasizing the role of depression in development of cancer) that cancer
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results from reduced activity of the sympathetic nerves, or unopposed
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action of the parasympathetic system. That stress has a role in cancer
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is acknowledged by the scientific establishment, but the nervous system’s
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direct involvement in the regulation of cellular metabolism, cell division,
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and other processes that are central to the cancerous state is either
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flatly denied or simply ignored.</p>
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<p>Although
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mast cells have been known to be a common component of tumors for many
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years, it is only recently that antihistamines and other antiinflammatory
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drugs have been recognized as valuable therapies in cancer. The whole
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issue of the role of nerves in tumor development and physiology has
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been submerged by the mystique of the “intrinsically bad cancer cell.”</p>
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<p>In
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Alzheimer’s disease, there has been a great investment in the doctrine
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that drugs to promote the function of cholinergic (acetylcholine forming)
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nerves will restore lost mental function, or at least retard the progression
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of the disease. The success of <strong><em>anti</em></strong>cholinergic drugs in
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treating several degenerative brain diseases is probably embarrassing
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to the companies whose cholinergic-intensifying drugs aren’t very
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successful. Conveniently for them, these formerly “anticholinergic”
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drugs are now being called anti-excitotoxic or anti-glutamatergic drugs.
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There is no serious conflict in the terminology, since the cholinergic
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processes (like the serotonergic processes) are closely associated with
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excitotoxic nerve damage. The cholinergic drugs will probably be sold
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as long as their patents are effective, and then will be quietly forgotten.</p>
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<p>The
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modern conception of pharmacology, with receptors and transmitters turning
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functions on or off, has turned into an unproductive and dangerous scholasticism.
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No one will ever successfully count the number of transmitter angels
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dancing on the variable sites of the variable receptor molecules. The
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functional “meaning” of a receptor or transmitter changes according
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to circumstances, and the effect of activating a particular nerve depends
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on surrounding conditions, and on preceding conditions. Each cell integrates
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stimuli adaptively.</p>
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<p>If
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no reflex is simply mechanical and innate, then all reflexes are conditional.
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(M. Merleau-Ponty argued against the validity of the reflex concept
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itself, because of this conditionality.) P. K. Anokhin’s concept of
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the “Acceptor of Action” (described in my book, <strong><em>Mind and Tissue</em></strong>)
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provides an image in which we can see the “set-points” for the relatively
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“autonomic” reflexes as reflections of the general needs of the
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organism. The local tissue reflexes, the organ reflexes, the spinal
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reflexes, etc., are variable, according to their energetic resources,
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and according to the way in which they are organized under the influence
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of the cerebral cortex and the environment. </p>
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<p>The
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reality is more complex than the philosophy of the drug industry imagines,
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but the solutions of problems can be much simpler, if we think in terms
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||
of energetic support, rather than the over-concretized interventions
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of the pharmacologists. In hypothyroidism, it is common for there to
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be an excess of adrenalin/noradrenalin, serotonin, histamine, and some
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of the pituitary hormones. Correcting thyroid function can immediately
|
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correct many problems, but especially when the energy deficiency has
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caused anatomical adjustments (redistribution of blood vessels and mast
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cells, for example) it’s important to make the environment supportive
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in as many ways as possible.</p>
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<p>In
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polycystic ovaries, menopausal symptoms, arthritis, angina pectoris,
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multiple sclerosis, some kinds of dementia, migraine, and emphysema,
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||
the relief achieved with a simple improvement of cellular energy can
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be rapid and complete. Presumably a similar process of biological reorganization
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is involved in the occasional spontaneous regression of tumors. </p>
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<p>Although
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I don’t think the autonomic nervous system, with its sympathetic and
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parasympathetic divisions, exists in the way it has traditionally been
|
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conceived, the idea can be useful if we think of using drugs and other
|
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factors in ways that tend to <strong><em>“quiet an overactive autonomic
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nervous system.” </em></strong></p>
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<h2>References</h2>
|
||
<small>
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||
<p>Am
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J Emerg Med 1989 Sep;7(5):485-8. <strong>Coronary artery spasm induced by
|
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intravenous epinephrine overdose.</strong> Karch SB. A 27-year-old man was
|
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accidentally given 2 mg intravenous epinephrine instead of 2 mg naloxone.
|
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He immediately developed chest pain, nausea, and diaphoresis. An ECG
|
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taken shortly after the epinephrine administration showed widespread
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ischemia. Forty-five minutes later the tracing still showed an early
|
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repolarization pattern, but ST elevation was less marked and the patient
|
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was asymptomatic. Serum potassium was 3.2 mEq/L and serum catecholamines,
|
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drawn approximately 20 minutes after the epinephrine administration,
|
||
were 10 times normal (dopamine, 173 ng/L; epinephrine, 1,628 ng/L; norepinephrine,
|
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1,972 ng/L). There are seven other reports of intravenous epinephrine
|
||
overdose in the English literature. Two of the previously reported cases
|
||
had 12-lead ECGs within the first hour. In both there was evidence of
|
||
transient ischemia similar to that observed in this case. Most of the
|
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patients had symptoms consistent with angina,<strong> and several developed
|
||
pulmonary edema. These findings suggest that, in humans, large intravenous
|
||
doses of epinephrine are likely to produce coronary artery spasm and
|
||
may decrease coronary artery perfusion.</strong></p>
|
||
|
||
<p>Res
|
||
Exp Med (Berl) 1987;187(5):385-93. <strong>Possible interaction of platelets
|
||
and adrenaline in the early phase of myocardial infarction.</strong> Seitz
|
||
R, Leising H, Liebermann
|
||
A, Rohner I, Gerdes H, Egbring R. “<strong>It is known that in most cases
|
||
of transmural acute myocardial infarction a platelet clot originates
|
||
within a coronary artery. In acute myocardial infarction patients increased
|
||
levels of the plasma catecholamines adrenaline and
|
||
noradrenaline as well as the platelet release proteins platelet factor
|
||
4 and beta-thromboglobulin have been reported.” </strong>
|
||
</p>
|
||
<p>Anesthesiology
|
||
1991 Jun;74(6):973-9. Comment in: Anesthesiology. 1992 Mar;76(3):475. <strong>
|
||
Magnesium inhibits the hypertensive but not the
|
||
cardiotonic actions of low-dose epinephrine.</strong> Prielipp RC, Zaloga
|
||
GP, Butterworth JF 4th, Robertie PG, Dudas LM, Black KW, Royster RL.
|
||
Intravenous magnesium supplementation is often used to control cardiac
|
||
arrhythmias and coronary artery vasospasm resulting from disturbances
|
||
of magnesium homeostasis after coronary artery bypass surgery. Many
|
||
such patients also require inotropic drug support of depressed myocardial
|
||
function. However, increased serum magnesium concentrations directly
|
||
depress cardiac contractility in animals and may interfere with catecholamine
|
||
actions. To determine whether small intravenous doses of magnesium sulfate
|
||
(MgSO4) interfere with the cardiotonic actions of epinephrine, we examined
|
||
the hemodynamic effects of MgSO4 and epinephrine infusion in 17 cardiac
|
||
surgical patients on their 1st postoperative day in a prospective, controlled
|
||
study. In 11 patients, infusion of MgSO4 (7-mg.kg-1 bolus followed by
|
||
10 mg.kg-1.h-1 as a continuous infusion) increased serum magnesium concentrations
|
||
by 44% (mean +/- standard error of the mean [SEM] of 0.8 +/- 0.1 to
|
||
1.2 +/- 0.1 mM; P less than 0.01) but had no significant effect on heart
|
||
rate; mean arterial, central venous, or pulmonary arterial occlusion
|
||
pressures; or cardiac output. Epinephrine infusion (30 ng.kg-1.min-1)
|
||
significantly increased cardiac index (2.7 +/- 0.1 to 3.1 +/- 0.21.min-1.m-2;
|
||
P less than 0.05); this effect was not altered by MgSO4 administration
|
||
(n = 11). However, MgSO4 significantly blunted epinephrine's hypertensive
|
||
action and prevented a significant increase in mean arterial pressure
|
||
during concurrent MgSO4-epinephrine administration. Six placebo control
|
||
patients were given two sequential infusions of epinephrine separated
|
||
by a placebo infusion to rule out an effect of time on the hemodynamic
|
||
response to epinephrine. Mean arterial pressure and cardiac index responses
|
||
to epinephrine were identical before and after placebo infusion.
|
||
|
||
</p>
|
||
<p>Jpn
|
||
Heart J 1979 Jan;20(1):75-82. <strong>Inhibition of constrictor responses
|
||
of dog coronary artery by atropine. A possible effectiveness of atropine
|
||
on variant form of angina pectoris.</strong> Sakanashi M, Furukawa T, Horio
|
||
Y. A possible effectiveness of atropine on variant form of angina pectoris
|
||
was investigated using the left circumflex coronary arterial strips
|
||
of dogs. Acetylcholine 10(-5)--10(-3) Gm/ml dose-dependently constricted
|
||
the isolated arterial strips during potassium-contracture in 6 cases,
|
||
and repetitive applications of acetylcholine could produce the similar
|
||
contractions to the control. In 18 strips atropine 10(-6) Gm/ml significantly
|
||
depressed the contractions of coronary arteries induced by acetylcholine
|
||
10(-5)--10(-3) Gm/ml. In 5 arterial strips atropine 10(-6) Gm/ml <strong>
|
||
significantly inhibited norepinephrine-induced responses</strong> of these
|
||
arteries, and by 10(-5) Gm/ml further suppression of the responses was
|
||
obtained. The <strong>results suggest that atropine may suppress the contractile
|
||
responses of the coronary artery induce by
|
||
acetylcholine and nonrepinephrine through a
|
||
muscarinic-receptor blocking action and simultaneously partly through
|
||
an adrenergic alpha-receptor blocking action.</strong>
|
||
</p>
|
||
<p>Eur
|
||
J Clin Pharmacol 1981;20(4):245-50. <strong>Effect of long-term beta-blockade
|
||
with alprenolol on platelet function and
|
||
fibrinolytic activity in patients with coronary heart disease.</strong> Jurgensen
|
||
HJ, Dalsgaard-Nielsen J, Kjoller E, Gormsen J.</p>
|
||
|
||
<p>C
|
||
R Seances Soc Biol Fil 1987;181(3):242-8.<strong> [Adrenaline activates oxidative
|
||
phosphorylation of rat liver mitochondria through alpha 1-receptors].</strong>
|
||
Breton L, Clot JP, Bouriannes J, Baudry M. We studied the effects and
|
||
mode of action of epinephrine on the oxidative phosphorylation of rat
|
||
liver mitochondria. With either succinate or beta-hydroxybutyrate as
|
||
substrate, i.v. injection of 1.5 microgram/100 g epinephrine increased
|
||
the respiratory rates by 30-40% in state 3 (with ADP), and by 20-30%
|
||
in state 4 (after ADP phosphorylation), so that the respiratory control
|
||
ratio (state 3/state 4) changed little. The respiratory stimulation
|
||
by epinephrine was maximal 20 minutes after its injection. The action
|
||
of epinephrine on mitochondria was blocked by pretreatment of the animals
|
||
with the alpha 1-antagonist prazosin but not by treatment with the beta-antagonist
|
||
propranolol. I. v. injection of 10 micrograms/100 g phenylephrine evoked
|
||
the same mitochondrial response as epinephrine. I. v. administration
|
||
of 50 micrograms/100 g dibutyryl cyclic AMP enhanced glycaemia but did
|
||
not affect mitochondrial respiration. Epinephrine therefore has an alpha
|
||
1-type of action on mitochondrial oxidative phosphorylation.
|
||
</p>
|
||
<p>Biochimie
|
||
1975;57(6-7):797-802. <strong>Effects of
|
||
catecholamines on rat myocardial metabolism. I. Influence of
|
||
catecholamines on energy-rich nucleotides and
|
||
phosphorylated fraction contents.</strong> Merouze P, Gaudemer Y. 1. The
|
||
influence of catecholamines (adrenaline and noradrenaline) on energy
|
||
metabolism of the rat myocardium has been studied by incubating slices
|
||
of this tissue with these hormones and by following the levels of the
|
||
different phosphorylated fractions and adenylic nucleotides. 2. Similar
|
||
effects are obtained with both hormones, adrenaline being more effective.
|
||
3<strong>. Catecholamines decrease significantly the total amount of phosphate
|
||
while Pi content increases during the first 10 minutes of incubation;
|
||
labile and residual phosphate contents increase at the beginning of
|
||
incubation and decrease to the initial values afterwards. 4. ATP and
|
||
ADP levels decrease significantly</strong> with both hormones; however, the
|
||
effect of noradrenalin on the ATP level needs a longer time of incubation. <strong>
|
||
|
||
The ATP/ADP ratios decrease after 5 minutes incubation and the total
|
||
adenylic nucleotide content is severely decreased (35 per cent with
|
||
adrenalin, after 20 minutes incubation). 5. Similar results have been
|
||
obtained with other tissues; these results can explain the decrease
|
||
of aerobic metabolism we observed under the same conditions.</strong>
|
||
</p>
|
||
<p>Eur
|
||
J Pharmacol 1982 Jul 30;81(4):569-76<strong>. Actions of
|
||
serotonin antagonists on dog coronary artery.</strong> Brazenor RM, Angus
|
||
JA. <strong>“Serotonin released from platelets may initiate coronary
|
||
vasospasm</strong> in patients with variant angina. If this hypothesis is
|
||
correct, serotonin antagonists without constrictor activity may be useful
|
||
in this form of angina. We have investigated drugs classified as serotonin
|
||
antagonists on dog circumflex coronary artery ring segments in vitro.
|
||
Ergotamine, dihydroergotamine,<strong> bromocriptine,
|
||
lisuride, ergometrine, ketanserin,
|
||
trazodone, cyproheptadine and pizotifen caused
|
||
non-competitive antagonism of serotonin concentration-response</strong> curves.
|
||
In addition, ketanserin, trazodone, bromocriptine and pizotifen inhibited
|
||
noradrenaline responses in concentrations similar to those required
|
||
for serotonin antagonism. All drugs with the exception of ketanserin,
|
||
cyproheptadine and pizotifen showed some degree of intrinsic constrictor
|
||
activity.” “Of the<strong> drugs tested,
|
||
ketanserin may be the most useful in variant angina since it is a potent
|
||
5HT antagonist, lacks agonist activity and has
|
||
alpha-adrenoceptor blocking activity.”</strong></p>
|
||
|
||
<p>Arch
|
||
Mal Coeur Vaiss 1983 Feb;76 Spec No:3-6.<strong> Role of autonomic nervous
|
||
system in the pathogenesis of angina pectoris.</strong> Yasue H. “The attacks
|
||
of vasospastic angina or coronary spasm can be induced by injection
|
||
of epinephrine, cold pressor test, Valsalva maneuver, and exercise.”
|
||
“The attacks of vasospastic angina can also be induced by injection
|
||
of methacholine, a parasympathomimetic agent, and this reaction is suppressed
|
||
by atropine, a parasympathetic blocking agent. Thus,<strong> parasympathetic
|
||
nervous system also seems to play a role in the production of
|
||
vasospastic angina. The attacks of
|
||
vasospastic angina can be easily induced by
|
||
adrenergic or parasympathetic stimuli from midnight to early morning
|
||
but is</strong> usually not provoked by these stimuli in the daytime. Thus,
|
||
there is circadian variation in the reactivity of coronary arteries
|
||
to adrenergic or parasympathetic stimuli. There are also weekly, monthly
|
||
and yearly variations of the reactivity of coronary arteries to these
|
||
stimuli. Thus, <strong>alpha adrenergic or parasympathetic activity is not
|
||
the sole factor in the production of
|
||
vasospastic angina.</strong> Angina pectoris caused by increased myocardial
|
||
oxygen demand is induced by infusion of isoproterenol, a beta adrenergic
|
||
stimulant, and is suppressed by propranolol but not by phentolamine.”
|
||
</p>
|
||
<p>Nippon
|
||
Yakurigaku Zasshi 1986 Mar;87(3):281-90. <strong>[Vasoconstrictor responses
|
||
of isolated pig coronary arteries].</strong> [Article in Japanese] Ikenoue
|
||
K, Kawakita S, Toda N.<strong> “In helical strips of pig coronary arteries,
|
||
histamine, serotonin, acetylcholine and a stable analogue of
|
||
thromboxane A2 (9, 11-epithio-11, 12-methano
|
||
TXA2: s-TXA2) produced a dose-dependent contraction. The histamine-induced
|
||
contraction</strong> was suppressed by treatment with chlorpheniramine, suggesting
|
||
an involvement of H1 receptors. <strong>Contractile responses to
|
||
serotonin were attenuated by not only
|
||
ketanserin, an S2 antagonist, but also by
|
||
cinanserin and methysergide.</strong>” “Contractile responses to histamine
|
||
were potentiated by treatment with low concentrations of serotonin or
|
||
s-TXA2. Contractile responses to serotonin were also potentiated by
|
||
low concentrations of histamine or s-TXA2. Removal of the endothelium
|
||
from pig coronary arterial strips potentiated contractions induced by
|
||
serotonin, histamine and norepinephrine. These results suggest that,
|
||
in addition to damaged endothelium, <strong>integrating action of endogenous
|
||
vasoconstrictors, including histamine,
|
||
serotonin, TXA2 and norepinephrine, may play an important role in producing
|
||
coronary vasospasm.”</strong></p>
|
||
|
||
<p>Jpn
|
||
Heart J 1987 Sep;28(5):649-61<strong>. The role of parasympathetic nerve
|
||
activity in the pathogenesis of coronary
|
||
vasospasm.</strong> Suematsu M, Ito Y, Fukuzaki H. To evaluate the role of
|
||
the autonomic nervous system, especially the parasympathetic nervous
|
||
system, in the initiation mechanism of vasospastic angina pectoris (AP),
|
||
the coefficient of R-R interval variation (CV) on the electrocardiogram
|
||
(ECG) and plasma catecholamine concentration were measured in 25 patients
|
||
with vasospastic AP, 10 patients with effort AP and 12 control subjects.
|
||
CV which has been recognized as reflecting parasympathetic nervous system
|
||
activity was calculated from 100 consecutive heart beats on the ECG
|
||
and represented as the percentage of standard deviation of the R-R interval
|
||
per mean R-R interval. Repeated measurements of <strong>plasma
|
||
catecholamine concentration revealed higher values at any sampling point
|
||
throughout a day in patients with vasospastic AP than those in </strong>
|
||
control subjects. A distinctly higher CV was observed at night in the
|
||
vasospastic AP group. <strong>This elevated CV was abolished by atropine
|
||
sulfate (1.5 mg/day per os). Pilocarpine injection (1.3 mg/10 kg
|
||
B.W. subcutaneously) induced a marked increase</strong> in CV that preceded
|
||
the occurrence of chest pain and/or ischemic ECG changes in 5 patients
|
||
with vasospastic AP. The<strong> increment in CV at 10 min after
|
||
pilocarpine administration was greater in
|
||
vasospastic AP than in control subjects (p less than 0.05). It is concluded
|
||
that enhanced parasympathetic activity may play a role in the initiation
|
||
of coronary vasospasm associated with sympathetic hyperactivity.</strong>
|
||
</p>
|
||
<p>Science
|
||
1984 Mar 30;223(4643):1435-7.<strong> Coronary arteries of cardiac patients
|
||
are hyperreactive and contain stores of amines: a mechanism for coronary
|
||
spasm.</strong> Kalsner S, Richards R. Coronary arteries from hearts of cardiac
|
||
patients contain significantly higher concentrations of histamine than
|
||
do those from noncardiac patients. The coronary vessels of cardiac patients
|
||
are also hyperresponsive to histamine and serotonin. These differences
|
||
between groups of patients suggest an explanation for coronary artery
|
||
spasm in heart disease.</p>
|
||
|
||
<p>Fed
|
||
Proc 1985 Feb;44(2):321-5. <strong>Coronary artery reactivity in human vessels:
|
||
some questions and some answers.</strong> Kalsner S. “It is now clear that
|
||
human coronary arteries in vitro contract to acetylcholine but that
|
||
relaxation is the only response observed in dog coronary vessels. <strong>
|
||
Acetylcholine is as powerful a constrictor of human coronary arteries,
|
||
in terms of tension induced, as 5-hydroxytryptamine (5-HT) or histamine
|
||
and is a substantially more powerful constrictor than
|
||
norepinephrine.</strong> Field stimulation of coronary artery strips caused
|
||
a vasoconstriction that was partially antagonized by atropine (3.45
|
||
X 10(-6) M).” “Coronary tissue from cardiac patients also contains
|
||
stores of 5-HT and histamine, and the histamine levels are substantially
|
||
increased above the values in vessels from noncardiac patients. Coronary
|
||
artery spasm or contraction<strong> probably can be initiated by diverse
|
||
intrinsic and extrinsic influences, including autonomic discharge from
|
||
either the parasympathetic or sympathetic nervous system or from histamine
|
||
or 5-HT, and probably no one agent or entity is causative in all cases.”</strong>
|
||
</p>
|
||
<p>Ann
|
||
N Y Acad Sci 1969 Oct 14;164(2):517-9. <strong>Induced
|
||
carcinogenesis under various influences on the hypothalamus.</strong> Kavetsky
|
||
RE, Turkevich NM, Akimova RN, Khayetsky IK, Matveichuck YD. </p>
|
||
|
||
<p>Kavetsky
|
||
RE, (editor) <strong><em>The Neoplastic Process and the Nervous
|
||
System,</em></strong>Kiev, 1958.</p>
|
||
<p>Ann
|
||
N Y Acad Sci 1966 Jan 21;125(3):933-45. <strong>On the
|
||
psychophysiological mechanism of the organism's resistance to tumor
|
||
growth.</strong> Kavetsky RE, Turkevich NM, Balitsky KP.
|
||
</p>
|
||
<p>Patol
|
||
Fiziol Eksp Ter 1971 Sep-Oct;15(5):3-10. <strong>[Role of disorders in
|
||
intra-cellular and neuro-humoral regulation in the development of the
|
||
tumor process]. </strong>[Article in Russian] Kavetskii RE, Balitskii KP.
|
||
|
||
</p>
|
||
<p>Mil’man,
|
||
M.S., <strong>The sympathetic nervous system and the source of tumors,</strong>
|
||
Problems of Oncology IX, 162-173, 1936.</p>
|
||
<p>Obstet
|
||
Gynecol Surv 1977 May;32(5):267-81. <strong>Estrogen and
|
||
endometrial carcinoma. </strong>Knab DR. “1. It has become evident that
|
||
the estrogen secreting tumors of the ovary are associated with endometrial
|
||
carcinoma, but this association is most easily observed in the postmenopausal
|
||
patient where the incidence of carcinoma has been<strong> reported at 10.3%
|
||
(1. 02) to 24% (83). 2. The most consistent association of
|
||
endometrial carcinoma is with polycystic ovarian disease, where 19 (34),
|
||
21 (152), and 25% (150) of young women with
|
||
endometrial carcinoma had Stein-Leventhal syndrome (67). </strong>
|
||
3. A very significant discovery became known in 1967 when the peripheral
|
||
aromatization of delta4 androstenedione to estrone was reported by Kase
|
||
(94) and MacDonald (111,112). Since that time we have learned that endometrial
|
||
carcinoma patients have an increased peripheral conversion (139) (0.1%
|
||
compared to 0.027%), which is similar to that found in obese and aging
|
||
patients, by Hemsell, et al (77). This can be 2 to 4 times greater than
|
||
the young adult or the patient without cancer.” “Similarly patients
|
||
with polycystic ovary disease, hyperthecosis and lipoid cell tumors
|
||
of the ovary demonstrate androgen excess with extraglandular conversion
|
||
to estrone (2). 4. It has become apparent that the principal estrogen
|
||
in the postmenopausal patient is estrone and that the estrone-estradiol
|
||
ratio in the serum is higher in postmenopausal women with corpus cancer
|
||
than similar patients without cancer (135).” “5. With the lack of
|
||
ovarian estrogen there is a relative excess of adrenal testosterone,
|
||
dihydrotestosterone and delta4 androstenedione, the available precursors
|
||
of extraglandular estrone (1). 6. With the passage of time <strong>it appears
|
||
that endometrial carcinoma is associated with hypothalamic "hyperactivity"</strong>
|
||
|
||
(31)....” </p>
|
||
<p>Endocrinology
|
||
2000 Mar;141(3):1059-72.<strong> An increased
|
||
intraovarian synthesis of nerve growth factor and its low affinity receptor
|
||
is a principal component of steroid-induced
|
||
polycystic ovary in the rat.</strong> Lara HE, Dissen GA, Leyton V, Paredes
|
||
A, Fuenzalida H, Fiedler JL, Ojeda SR. A form of polycystic ovary (PCO)
|
||
resembling some aspects of the human PCO syndrome can be induced in
|
||
rats by a single injection of estradiol valerate (EV). An increase in
|
||
sympathetic outflow to the ovary precedes, by several weeks, the appearance
|
||
of cysts, suggesting the involvement of a neurogenic component in the
|
||
pathology of this ovarian dysfunction. The present study was carried
|
||
out to test the hypotheses that this change in sympathetic tone is related
|
||
to an augmented production of ovarian nerve growth factor (NGF), and
|
||
that this abnormally elevated production of <strong>NGF contributes to the
|
||
formation of ovarian cysts induced by
|
||
EV. Injection of the steroid resulted in increased
|
||
intraovarian synthesis of NGF</strong> and its low affinity receptor, p75
|
||
NGFR. The increase was maximal 30 days after EV, coinciding with the
|
||
elevation in sympathetic tone to the ovary and preceding the appearance
|
||
of follicular cysts. Intraovarian injections of the retrograde tracer
|
||
fluorogold combined with in situ hybridization to detect tyrosine hydroxylase
|
||
(TH) messenger RNA-containing neurons in the celiac ganglion revealed
|
||
that these changes in NGF/p75 NGFR synthesis are accompanied by selective
|
||
activation of noradrenergic neurons projecting to the ovary. The levels
|
||
of RBT2 messenger RNA, which encodes a beta-tubulin presumably involved
|
||
in slow axonal transport, were markedly elevated, indicating that EV-induced
|
||
formation of ovarian cysts is preceded by functional activation ofceliac
|
||
ganglion neurons, including those innervating the ovary. Intraovarian
|
||
administration of a neutralizing antiserum to NGF in conjunction with
|
||
an antisense oligodeoxynucleotide to p75 NGFR, via Alzet osmotic minipumps, <strong>
|
||
restored estrous cyclicity and ovulatory capacity in a</strong> majority
|
||
of EV-treated rats. These functional changes were accompanied by restoration
|
||
of the number of antral follicles per ovary that had been depleted by
|
||
EV and a significant reduction in the number of both precystic follicles
|
||
and<strong> follicular cysts. The results indicate that the
|
||
hyperactivation of ovarian sympathetic nerves seen in
|
||
EV-induced PCO is related to an overproduction of
|
||
NGF and its low affinity receptor in the gland. They also suggest that
|
||
activation of this neurotrophic-neurogenic regulatory loop is a component
|
||
of the pathological process by which
|
||
EV induces cyst formation and anovulation in rodents. The</strong> possibility
|
||
exists that a similar alteration in neurotrophic input to the ovary
|
||
contributes to the etiology and/or maintenance of the PCO syndrome in
|
||
humans.</p>
|
||
|
||
<p>Acta
|
||
Physiol Hung 1996;84(2):183-90.<strong> Effects of hormones on the number,
|
||
distribution and degranulation of mast cells in the ovarian complex
|
||
of mice.</strong> Jaiswal K, Krishna A. The changes in the number and degranulation
|
||
pattern of mast cells varied with the types of hormonal treatment and
|
||
ovarian compartment. <strong>Luteinizing hormone
|
||
(LH), follicle stimulating hormone
|
||
(FSH), thyroid stimulating hormone
|
||
(TSH) and 17-beta estradiol (E2) treatment caused increase (P < 0.05)
|
||
in the number of mast cells</strong> in the hilum as compared with the controls.
|
||
Increase (P < 0.05) in the number of mast cells in the whole ovarian
|
||
complex was observed only following FSH and E2 treatment. All the hormones
|
||
used in the present study increased the percentage degranulation of
|
||
mast cells in the hilum. However, only LH, FSH and E2 increased the
|
||
percentage degranulation of mast cells in other compartments of the
|
||
ovary (medulla, bursa and cortex). TSH and ACTH failed to cause any
|
||
increase in the percentage degranulation of mast cells in these compartments.
|
||
The present findings indicate E2 to be the most potent among the hormones
|
||
tested in causing degranulation of mast cells in all ovarian compartments.
|
||
</p>
|
||
<p>Fertil
|
||
Steril 2001 Jun;75(6):1141-7. <strong>Increase in nerve fibers and loss of
|
||
mast cells in polycystic and postmenopausal ovaries.</strong> Heider U, Pedal
|
||
I, Spanel-Borowski K. OBJECTIVE: To quantify nerve fibers and mast cells
|
||
in human ovaries at different functional stages. DESIGN: Retrospective
|
||
study. SETTING: Research laboratory of the university. SPECIMEN(S):
|
||
8 human ovaries in the follicular (cyclic) phase, 7 polycystic ovaries,
|
||
and postmenopausal ovaries with (n=5) or without (n=7) hyperthecosis.
|
||
MAIN OUTCOME MEASURE(S): Single- and double immunohistology for the
|
||
S100 antigen in glial cells of autonomic nerve fibers, for chymase and
|
||
tryptase in mast cells, and for the common leukocyte antigen on leukocytes.
|
||
Histometric evaluation was also performed. INTERVENTION(S): None. RESULT(S):
|
||
Polycystic ovaries contained significantly more S100-positive nerve
|
||
fibers in the corticomedullary region than did cyclic ovaries (mean
|
||
+/- SD per 2-mm(2) area, 476 +/- 136 and 224 +/- 133; P<.01). Postmenopausal
|
||
ovaries with or without hyperthecosis had the highest density of nerve
|
||
fibers. In cyclic and polycystic ovaries, more tryptase-positive mast
|
||
cells than chymase-positive mast cells were found in the interstitial
|
||
cortex and the medulla. In cyclic ovaries, areas with a moderate density
|
||
of nerve fibers contained many mast cells. Hence, <strong>with increasing
|
||
nerve fiber density in polycystic ovaries, the number of mast cells
|
||
decreased strikingly compared with cyclic ovaries (p<.001). Almost
|
||
no mast cells were seen in postmenopausal ovaries</strong> with and without
|
||
hyperthecosis. The number of leukocyte antigen-positive leukocytes was
|
||
similar in all groups. CONCLUSION(S): The high density of nerve fibers
|
||
in polycystic and postmenopausal ovaries, together with a conspicuous
|
||
decrease in mast cells, indicates altered neuroimmune communication.
|
||
|
||
</p>
|
||
<p>Endocrinology
|
||
1993 Dec;133(6):2696-703. <strong>Ovarian
|
||
steroidal response to gonadotropins and
|
||
beta-adrenergic stimulation is enhanced in
|
||
polycystic ovary syndrome: role of sympathetic
|
||
innervation.</strong> Barria A, Leyton V, Ojeda SR, Lara HE. Experimental
|
||
induction of a polycystic ovarian syndrome (PCOS) in rodents by the<strong>
|
||
administration of a single dose of
|
||
estradiol valerate (EV) results in activation of the peripheral sympathetic
|
||
neurons that innervate the ovary. This activation is evidenced by an
|
||
increased capacity of ovarian nerve terminals to incorporate and release
|
||
norepinephrine (NE), an increase in ovarian NE content, and a</strong> decrease
|
||
in ovarian beta-adrenergic receptor number in the ovarian compartments
|
||
receiving catecholaminergic innervation. The present experiments were
|
||
undertaken to examine the functional consequences of this<strong> enhanced
|
||
sympathetic outflow to the ovary.</strong> The steroidal responses of the
|
||
gland to beta-adrenergic receptor stimulation and hCG were examined
|
||
in vitro 60 days after EV administration, i.e. at the time when follicular
|
||
cysts are well established. EV-treated rats exhibited <strong>a remarkable
|
||
increase in ovarian progesterone and androgen responses to
|
||
isoproterenol, a beta-adrenergic receptor
|
||
agonist, with no changes in estradiol responsiveness. Basal
|
||
estradiol release was, however, 50-fold higher than the highest levels
|
||
released from normal ovaries at any phase of the estrous cycle.</strong>
|
||
The ovarian progesterone and androgen responses to hCG were enhanced
|
||
in EV-treated rats, as were the responses to a combination of isoproterenol
|
||
and hCG. Transection of the superior ovarian nerve (SON), which carries
|
||
most of the catecholaminergic fibers innervating endocrine ovarian cells,
|
||
dramatically reduced the exaggerated responses of all three steroids
|
||
to both beta-adrenergic and gonadotropin stimulation. SON transection
|
||
also reduced the elevated levels of ovarian NE resulting from EV treatment
|
||
and caused up-regulation of beta-adrenoreceptors. Most importantly,
|
||
SON transection restored estrous cyclicity and ovulatory capacity. The
|
||
results indicate that the increased output of ovarian steroids in PCOS
|
||
is at least in part due to an enhanced responsiveness of the gland to
|
||
both catecholaminergic and gonadotropin stimulation. The ability of
|
||
SON transection to restore a normal response indicates that the alteration
|
||
in steroid output results from a deranged activation of selective components
|
||
of the noradrenergic innervation to the ovary. These findings support
|
||
the concept that <strong>an alteration in the
|
||
neurogenic control of the ovary contributes to the etiology of
|
||
PCOS.</strong></p>
|
||
|
||
<p>Wilderness
|
||
Environ Med 2001 Spring;12(1):8-12. <strong>Alterations in autonomic nervous
|
||
control of heart rate among tourists at 2700 and 3700 m above sea level.</strong>
|
||
Kanai M, Nishihara F, Shiga T, Shimada H, Saito S. “RESULTS: Both
|
||
HF and LF heart rate variability <strong>decreased according to the elevation
|
||
of altitude</strong>.” “CONCLUSIONS: <strong>At 2700 and 3700 m, the activity
|
||
of the autonomic nervous system measured by heart rate variability was
|
||
decreased</strong> in untrained office workers. The sympathetic nervous system
|
||
was dominant to the parasympathetic at 3700 m. These alterations in
|
||
the autonomic nervous system might play some role in physical fitness
|
||
at high altitudes.”</p>
|
||
<p>Acta
|
||
Neuroveg (Wien) 1967;30(1):557-63. <strong>[Neuroautonomic reactivity of
|
||
the skin during high mountain climate treatment of skin diseases].</strong>
|
||
[Article in German] Chlebarov S.</p>
|
||
|
||
<p>Munch
|
||
Med Wochenschr 1966 Mar 18;108(11):589-92. <strong>[Changes of the
|
||
neurovegetative reactivity of the skin after Alpine climatic therapy].</strong>
|
||
[Article in German] Borelli S, Chlebarov S.</p>
|
||
<p>J
|
||
Appl Physiol 1978 May;44(5):647-51. <strong>Mechanism of the attenuated cardiac
|
||
response to beta-adrenergic stimulation in chronic
|
||
hypoxia.</strong> Maher JT, Deniiston JC, Wolfe DL, Cymerman A.<strong> “A blunting
|
||
of the chronotropic and inotropic responses of the heart to
|
||
beta-adrenergic stimulation occurs following chronic exposure to
|
||
hypobaric hypoxia.</strong>” “Neither monoamine oxidase activity nor
|
||
norepinephrine level of any region of the heart was altered by chronic
|
||
hypoxia. However, a twofold increase (P less than 0.001) <strong>in
|
||
catechol O-methyltransferase activity above sea-level values was found
|
||
in both the atria and ventricles of the
|
||
hypoxic animals.</strong> Thus, the attenuation in cardiac responsiveness
|
||
to beta-adrenoceptor stimulation in chronic hypoxia appears unrelated
|
||
to the level of vagal activity, but may be attributable to enhanced
|
||
enzymatic inactivation of catecholamines.”</p>
|
||
|
||
<p>Acta
|
||
Physiol Scand 1976 Jun;97(2):158-65. <strong>Effects of respiratory alkalosis
|
||
and acidosis on myocardial excitation.</strong> Samuelsson RG, Nagy G. In
|
||
anesthetized dogs electrocardiogram and monophasic action potentials
|
||
(MAPs) were recorded from the right atrium and the right ventricle by
|
||
intracardiac suction electrode technique. The animals were subjected,
|
||
by means of ventilation with CO2 and hyperventilation, to periods of
|
||
respiratory acidosis and respiratory alkalosis, respectively.<strong> Pronounced
|
||
respiratory acidosis induced an increased sympathetic activity </strong>
|
||
followed by a decrease in heart rate and prolongation of the A-V conduction
|
||
time whereas the shape and duration of the atrial and ventricular MAPs
|
||
remained unaltered. Arterial hypoxia in combination with pronounced
|
||
respiratory acidosis did not influence the MAP durations. Respiratory <strong>
|
||
alkalosis resulted in an increased sympathetic influence on the heart
|
||
activity</strong> whereas the shape and duration of the atrial and the ventricular
|
||
MAPs remained unaffected. <strong>During pronounced hyperventilation with
|
||
increasing central venous pressure an increased parasympathetic influence </strong>
|
||
on the heart activity with decrease in the heart rate, prolongation
|
||
of the A-V conduction time and shortening of the atrial MAP duration
|
||
was recorded.</p>
|
||
|
||
<p>Biull
|
||
Eksp Biol Med 1978 Nov;86(11):525-8. <strong>[Effect of
|
||
neuromediators on acid-base status].</strong> [Article in Russian] Lazareva
|
||
LV, Bazarevich GI, Makarova LV. A relationship between the state of
|
||
adrenergic, cholinergic, and serotoninergic systems, on the one hand,
|
||
and the acid-alkaline balance of the organism, on the other hand, was
|
||
revealed in sharp and chronic experiments on dogs. A surplus of each
|
||
of the mediators was accompanied by respiratory alkalosis, and its deficiency--by
|
||
combined respiratory and metabolic acidosis.</p>
|
||
<p>Can
|
||
J Physiol Pharmacol 1987 May;65(5):1078-85. <strong>Pathophysiology of pH
|
||
and Ca2+ in bloodstream and brain.</strong> Somjen GG, Allen BW, Balestrino
|
||
M, Aitken PG. The highlights of the literature and our work on tetany
|
||
and hyperventilation are reviewed. Our studies concern the following:
|
||
(1) the changes of [Ca2+] in circulating plasma caused by respiratory
|
||
and "metabolic" acidosis and alkalosis; (2) critical plasma
|
||
[Ca2+] levels associated with signs of tetany and neuromuscular blockade;
|
||
(3) changes in cerebral [Ca2+]o caused by hypo- and hyper-calcaemia,
|
||
and the changes in cerebral [Ca2+]o and pHo caused by acute systemic
|
||
acidosis and alkalosis; and (4) effects of changing [Ca2+]o and pHo
|
||
levels on synaptic transmission in hippocampal formation. Our main conclusions
|
||
are (1) changes of plasma [Ca2+] caused by "metabolic" pH
|
||
changes are greater than those associated with varying CO2 concentration;
|
||
(2) acute systemic [Ca2+] changes are associated with small cerebral
|
||
[Ca2+]o changes; (3) the decreases in systemic and cerebral [Ca2+]o
|
||
caused by hyperventilation are too small to account for the signs and
|
||
symptoms of hypocapnic tetany; (4) moderate decrease of [Ca2+]o depresses
|
||
and its increase enhances synaptic transmission in<strong>
|
||
|
||
hippocampal formation; and (5) H+ ions in
|
||
extracellular fluid have a weak depressant effect on neuronal excitability.
|
||
CO2 is a strong depressant, which is only partly explained by the acidity
|
||
of its solution. CO2 concentration is a significant factor in controlling
|
||
cerebral function.</strong></p>
|
||
<p>J
|
||
Hirnforsch 1991;32(5):659-664. <strong>Normalization of protein synthesis
|
||
and the structure of brain dystrophic neurons after the action of
|
||
hypoxia, 10% NaCl and organ-specific RNA.</strong> Polezhaev LV, Cherkasova
|
||
LV, Vitvitsky VN, Timonin AV N. I. Vavilov Institute of General Genetics,
|
||
USSR Academy of Sciences, Moscow. It was shown previously (Polezhaev
|
||
and Alexandrova, 1986) that hypoxic hypoxia causes mass (up to 30%)
|
||
diffuse dystrophy of brain cortex and hippocamp neurons in rats, disturbances
|
||
in the higher nervous activity, reduction of protein, RNA synthesis
|
||
in neurons and of DNA synthesis in the whole brain cortex. Transplantation
|
||
of embryonic nervous tissue (ENT) in one of the hemispheres normalizes
|
||
all the above abnormalities observed in some neurologic and mental diseases
|
||
in humans. However, transplantation may entail injuries of parenchyma
|
||
and brain blood vessels. This forces researchers to search for another
|
||
biological method similar by its action but safer and simpler. ENT transplantation
|
||
has a dual action: 1) formation of biologically active substances (BAS)
|
||
releasing from the ENT transplant and from the host brain nervous tissue
|
||
upon operation; 2) establishment of synaptic connections between the
|
||
transplant and host neurons. Previously we (Vitvitsky, 1987) described
|
||
the isolation of BAS from rat forebrain in the form of organ-specific
|
||
RNA. The latter was injected intraperitoneally several times to post-hypoxic
|
||
rats in which 30 min prior to that the blood-brain barrier (BBB) was
|
||
opened by injecting intravenously and intraperitoneally 10% NaCl solution
|
||
without damaging the host brain. At the beginning 10% NaCl increased
|
||
the destruction of brain cortical neurons and then stimulated protein
|
||
synthesis in them. RNA injections stimulated the synthesis in cortical
|
||
neurons and normalized their structure. Thus, we propose a safe and
|
||
simple method for normalization of dystrophic neurons which can be used
|
||
after certain improvement for curing neurodegenerative and neuropsychic
|
||
diseases in humans. </p>
|
||
|
||
<p>Group
|
||
processes</p>
|
||
<p>The
|
||
trouble with writing and painting is that they are considered to be
|
||
solitary and individualistic activities. In the 20th century, the idea
|
||
developed that they were “expressive,” rather than communicative,
|
||
as if there could be any sane distinction between those. The result
|
||
was that much of 20th century poetry and painting was insane. The products
|
||
of insanity aren’t necessarily worthless, but they are less than they
|
||
could be. </p>
|
||
|
||
<p>When
|
||
the writer and painter are in close contact with responsive people,
|
||
their product is adjusted to, and enriched by, the reactions they evoke. </p>
|
||
<p>J
|
||
Cardiovasc Pharmacol 1987;10 Suppl 2:S94-8; discussion S99. <strong>The effect
|
||
of beta-blockade on platelet function and
|
||
fibrinolytic activity.</strong> Winther K. Department of Clinical Chemistry,
|
||
Rigshospitalet, Copenhagen, Denmark. Two groups of hypertensives and
|
||
a group of migraine sufferers were tested during treatment with the
|
||
nonselective beta-blocker propranolol
|
||
and the beta 1-selective metoprolol. During treatment with propranolol,
|
||
an increased platelet aggregability and a decrease in platelet content
|
||
of cyclic AMP were seen when compared with metoprolol treatment. In
|
||
addition, propranolol treatment increased the plasma level of adrenaline
|
||
as well as the euglobulin clot lysis time. types of monoamine oxidase,
|
||
adrenaline </p>
|
||
|
||
<p>45:
|
||
Br J Pharmacol 1982 Feb;75(2):269-86
|
||
Coronary
|
||
vasoconstrictor and vasodilator actions of arachidonic acid in the
|
||
isolated perfused heart of the rat.
|
||
Belo
|
||
SE, Talesnik J.
|
||
The
|
||
administration of arachidonic acid (AA) to the isolated perfused heart
|
||
of
|
||
the
|
||
rat usually produced biphasic coronary responses characterized by initial
|
||
|
||
vasoconstriction
|
||
followed by prolonged vasodilatation. However, some responses
|
||
were
|
||
predominantly vasoconstrictor or vasodilator. The non-steroidal
|
||
anti-inflammatory
|
||
agents (NSAA) indomethacin (1-5 mg/l) and naproxen (12.5-25
|
||
mg/1)
|
||
reversibly inhibited both phases of the response induced by AA.
|
||
Pretreatment
|
||
of animals with indomethacin (5 mg/kg) or naproxen (25 mg/kg)
|
||
daily,
|
||
resulted in unaltered coronary response to AA. Subsequent addition of
|
||
|
||
NSAA
|
||
to the perfusate produced inhibition of the AA effect. Short infusions
|
||
of
|
||
acetylsalicylic
|
||
acid at low concentrations (2.9 micrograms/ml), dipyridamole
|
||
(0.6
|
||
micrograms/ml) and sulphinpyrazone (28.7 micrograms/ml) selectively
|
||
inhibited
|
||
the vasoconstrictor phase of the response to AA. It was confirmed that
|
||
metabolic
|
||
coronary dilatation induced by cardiostimulation was inhibited by
|
||
prolonged
|
||
AA administration; this effect was prevented by NSAA pretreatment.
|
||
|
||
Reactive
|
||
hyperaemic responses to short lasting occlusions of coronary inflow
|
||
<strong>were
|
||
unaffected by NSAA. Linolenic, linoleic,
|
||
dihomo-gamma-linolenic and oleic</strong>
|
||
<strong>acid
|
||
usually produced decreases in coronary flow which were unaffected by
|
||
NSAA,</strong>
|
||
<strong>dipyridamole
|
||
or sulphinpyrazone. Intra-aortic injections of AA,
|
||
prostacyclin</strong>
|
||
<strong>(PGI2)
|
||
and prostaglandin E2 (PGE2) in the intact rat produced a dose-dependent</strong>
|
||
<strong>decrease
|
||
in blood pressure with the AA response inhibited by
|
||
indomethacin. PGI2</strong>
|
||
|
||
and
|
||
PGE2 produced long lasting coronary vasodilatation in the isolated heart.
|
||
The
|
||
coronary actions of AA appear to be due to its transformation, within
|
||
the
|
||
easily
|
||
accessible vascular wall, into prostaglandin and thromboxane-like
|
||
<strong>substances.
|
||
We suggest that a vasoconstrictor thromboxane
|
||
A2-like substance may</strong>
|
||
<strong>be
|
||
responsible for coronary vasospasm. Coronary insufficiency may also
|
||
result</strong>
|
||
<strong>from
|
||
an inhibition of compensatory metabolic coronary dilatation by increased</strong>
|
||
|
||
<strong>synthesis
|
||
of PGE2 within the myocardial cell.</strong></p>
|
||
<p>42:
|
||
Br Heart J 1983 Jan;49(1):20-5
|
||
<strong>Platelet
|
||
reactivity and its dependence on alpha-adrenergic receptor function
|
||
in</strong>
|
||
<strong>patients
|
||
with ischaemic heart disease.</strong>
|
||
Yokoyama
|
||
M, Kawashima S, Sakamoto S, Akita H, Okada T, Mizutani T, Fukuzaki H.
|
||
We
|
||
studied 57 patients admitted to hospital with ischaemic heart disease,
|
||
|
||
including
|
||
nine patients with variant angina, to evaluate platelet reactivity and
|
||
its
|
||
dependence on alpha-adrenergic receptor function. The threshold
|
||
concentration
|
||
for biphasic platelet aggregation in response to adrenaline and
|
||
adenosine
|
||
diphosphate was measured in fresh platelet rich plasma. There were age
|
||
related
|
||
alterations in platelet responsiveness to adrenaline. In 27 age matched
|
||
control
|
||
subjects platelets showed adrenaline induced aggregation at a
|
||
|
||
concentration
|
||
higher than 0.1 mumol. The threshold concentrations for adrenaline
|
||
and
|
||
adenosine diphosphate were 0.91 mumol and 4.68 mumol. In 16 patients
|
||
with
|
||
acute
|
||
infarction, 14 with old infarction, nine with effort angina, and nine
|
||
with
|
||
rest
|
||
angina, mean values of platelet aggregation threshold for both adrenaline
|
||
and
|
||
adenosine diphosphate were not altered significantly when compared with
|
||
control
|
||
subjects. In contrast, the values for adrenaline and adenosine
|
||
|
||
diphosphate
|
||
in nine patients with variant angina were 0.012 mumol and 2.24 mumol
|
||
and
|
||
seven of them showed obvious platelet hyperactivity to adrenaline at
|
||
a concentration lower than 0.1 mumol. The threshold concentration for
|
||
adrenaline induced aggregation did not correlate with serum cholesterol
|
||
and triglyceride
|
||
levels.
|
||
</p>
|
||
<p>Am
|
||
Heart J 1985 Jun;109(6):1264-8. Reduction of plasma norepinephrine levels
|
||
in response to brief coronary occlusion in experimental dogs. Haneda
|
||
T, Arai T, Kanda H, Ikeda J, Takishima T. Although an increased plasma
|
||
norepinephrine (NE) level is sometimes observed
|
||
during
|
||
angina pectoris, it is difficult to say whether sympathetic overflow
|
||
is
|
||
|
||
its
|
||
cause. The left anterior descending coronary artery was occluded by
|
||
intracoronary
|
||
balloon for 3 minutes in 12 closed-chest anesthetized dogs. During
|
||
occlusion,
|
||
heart rate did not change but aortic pressure slightly decreased.
|
||
Occlusion
|
||
caused a significant reduction in both NE levels in the aorta (177 +/-
|
||
17
|
||
to 134 +/- 16 pg/ml, p less than 0.01) and in the great cardiac vein
|
||
(GCV)
|
||
296
|
||
+/- 44 to 249 +/- 44 pg/ml, p less than 0.01). After surgical vagotomy,
|
||
the
|
||
|
||
occlusion
|
||
increased NE levels in the aorta (227 +/- 44 to 278 +/- 43 pg/ml, p
|
||
less
|
||
than 0.01) and in GCV (384 +/- 76 to 444 +/- 81 pg/ml, p less than 0.01),
|
||
showing
|
||
the release of vagal inhibition. These results may be applicable to
|
||
<strong>patients
|
||
with transient anterior myocardial
|
||
ischemia; if plasma NE increases</strong>
|
||
<strong>without
|
||
marked hemodynamic changes, it is suggested that the sympathetic</strong>
|
||
<strong>overflow
|
||
is not a result but a possible cause of the
|
||
ischemia.</strong></p>
|
||
|
||
<p>25:
|
||
Exp Mol Pathol 1986 Apr;44(2):138-46
|
||
<strong>Intimal
|
||
thickening and the distribution of vasomotor nerves in the mechanically</strong>
|
||
<strong>injured
|
||
dog coronary artery.</strong>
|
||
Taguchi
|
||
T, Ishii Y, Matsubara F, Tanaka K.
|
||
Intimal
|
||
injury and atherosclerotic change seem to be causative factors linked
|
||
to
|
||
spasm
|
||
of the coronary artery. Intimal thickening was produced by mechanical
|
||
|
||
injury
|
||
to the endothelium of the canine coronary artery and we investigated
|
||
the
|
||
distribution
|
||
of adrenergic, cholinergic, and peptidergic nerves in the coronary
|
||
arteries.
|
||
Although adrenergic and cholinergic nerves were not altered in
|
||
<strong>density,
|
||
neuron specific enolase positive nerve fibers were increased in number</strong>
|
||
<strong>in
|
||
dogs killed 1 and 3 months after injury. Substance
|
||
P-containing fibers were</strong>
|
||
<strong>also
|
||
increased at 3 months after the induced injury.</strong>
|
||
|
||
</p>
|
||
<p>24:
|
||
J Am Coll Cardiol 1986 Jul;8(1 Suppl A):42A-49A
|
||
<strong>Mechanisms
|
||
of coronary spasm of isolated human
|
||
epicardial coronary segments</strong>
|
||
<strong>excised
|
||
3 to 5 hours after sudden death.</strong>
|
||
Vedernikov
|
||
YP.
|
||
Isolated
|
||
segments of epicardial coronary artery with and without severe
|
||
|
||
atherosclerotic
|
||
lesions excised from human hearts 3 to 5 hours after sudden
|
||
coronary
|
||
death demonstrated spontaneous contractile activity that was dependent
|
||
on
|
||
the external calcium level and was inhibited by calcium antagonists
|
||
and
|
||
activation
|
||
of beta-adrenoceptors (isoproterenol and high concentrations of
|
||
norepinephrine).
|
||
Isoproterenol, with a median effective dose (ED50) of 6.3 X
|
||
10(-7)
|
||
M, relaxed coronary segments that had been precontracted with 30 mM
|
||
|
||
<strong>potassium.
|
||
Stimulation of the alpha-adrenoceptors activated spontaneous</strong>
|
||
<strong>contractions
|
||
and increased tension. Norepinephrine
|
||
ED50 (in the presence of</strong>
|
||
<strong>10(-6)
|
||
M propranolol) was 2.3 X 10(-7) M, and tension at a maximal concentration</strong>
|
||
<strong>of
|
||
10(-4) M was 385.4 +/- 51.4 mg. The
|
||
ED50 for acetylcholine and histamine, the</strong>
|
||
<strong>potent
|
||
activators of coronary segment tone and
|
||
phasic contractility, was 3.98 X</strong>
|
||
10(-7)
|
||
and 8.9 X 10(-7) M, respectively; the maximal increase in tension was
|
||
|
||
1,079.5
|
||
+/- 175 (at 10(-4) M) and 1,131.3 +/- 302 mg (at 10(-5) M),
|
||
respectively.
|
||
Acetylcholine and histamine increased whereas high concentrations
|
||
of
|
||
norepinephrine failed to inhibit rhythmic activity and tension of coronary
|
||
artery
|
||
segments with severe atherosclerotic lesions. Membrane electrogenic
|
||
mechanisms
|
||
and ways of activating the contractile elements of human coronary
|
||
artery
|
||
smooth muscle are discussed.</p>
|
||
|
||
<p>Pharmacol
|
||
Rev 2000 Dec;52(4):595-638. <strong>The sympathetic
|
||
nerve--an integrative interface between two
|
||
supersystems: the brain and the immune system.</strong> Elenkov IJ, Wilder
|
||
RL, Chrousos GP, Vizi ES. Inflammatory Joint Diseases Section, Arthritis
|
||
and Rheumatism Branch, National Institute of Arthritis and Musculoskeletal
|
||
and Skin Diseases, National Institutes of Health, Bethesda, Maryland,
|
||
USA. The brain and the immune system are the two major adaptive systems
|
||
of the body. During an immune response the brain and the immune system
|
||
"talk to each other" and this process is essential for maintaining
|
||
homeostasis. Two major pathway systems are involved in this cross-talk:
|
||
the hypothalamic-pituitary-adrenal (HPA) axis and the sympathetic nervous
|
||
system (SNS). This overview focuses on the role of SNS in neuroimmune
|
||
interactions, an area that has received much less attention than the
|
||
role of HPA axis. Evidence accumulated over the last 20 years suggests
|
||
that <strong>norepinephrine (NE) fulfills the criteria for
|
||
neurotransmitter/neuromodulator in lymphoid organs.</strong> Thus, primary
|
||
and secondary lymphoid organs receive extensive sympathetic/noradrenergic
|
||
innervation. Under stimulation, NE is released from the sympathetic
|
||
nerve terminals in these organs, and the target immune cells express
|
||
adrenoreceptors. Through stimulation of these receptors, locally released
|
||
NE, or circulating catecholamines such as epinephrine, affect <strong>lymphocyte
|
||
traffic, circulation, and proliferation, and modulate
|
||
cytokine production and the functional activity of different lymphoid
|
||
cells.</strong> Although there exists substantial sympathetic innervation
|
||
in the bone marrow, and particularly in the thymus and mucosal tissues,
|
||
our knowledge about the effect of the sympathetic neural input on <strong>
|
||
hematopoiesis, thymocyte development, and
|
||
mucosal immunity</strong> is extremely modest. In addition, recent evidence
|
||
is discussed that <strong>NE and epinephrine, through stimulation of the
|
||
beta(2)-adrenoreceptor-cAMP-protein
|
||
kinase A pathway, inhibit the production of type
|
||
1/proinflammatory cytokines,</strong> such as interleukin (IL-12), tumor
|
||
necrosis factor-alpha, and interferon-gamma by antigen-presenting cells
|
||
and T helper (Th) 1 cells, whereas they <strong>stimulate the production
|
||
of type 2/anti-inflammatory cytokines such as IL-10</strong> and transforming
|
||
growth factor-beta. Through this<strong> mechanism, systemically, endogenous
|
||
catecholamines may cause a selective suppression of
|
||
Th1 responses and cellular immunity, and a
|
||
Th2 shift toward dominance of humoral immunity. On the other hand, in
|
||
certain local responses, and under certain conditions,
|
||
catecholamines may actually boost regional immune</strong> responses, through
|
||
induction of IL-1, tumor necrosis factor-alpha, and primarily IL-8 production.
|
||
Thus, the activation of SNS during an immune response might be<strong> aimed
|
||
to localize the inflammatory response, through induction of
|
||
neutrophil accumulation and stimulation of more specific
|
||
humoral immune responses, although systemically it may suppress
|
||
Th1 responses, and, thus protect the organism from the detrimental effects
|
||
of proinflammatory cytokines and other products of activated macrophages.</strong>
|
||
|
||
The above-mentioned immunomodulatory effects of catecholamines and the
|
||
role of SNS are also discussed in the context of their clinical implication
|
||
in certain <strong>infections, major injury and sepsis,
|
||
autoimmunity, chronic pain and fatigue syndromes, and tumor growth.</strong>
|
||
Finally, the pharmacological manipulation of the sympathetic-immune
|
||
interface is reviewed with focus on new therapeutic strategies using
|
||
selective alpha(2)- and beta(2)-adrenoreceptor agonists and antagonists
|
||
and inhibitors of phosphodiesterase type IV in the treatment of experimental
|
||
models of autoimmune diseases, fibromyalgia, and chronic fatigue syndrome.
|
||
</p>
|
||
<p>Am
|
||
J Physiol Cell Physiol 2000 Nov;279(5):C1665-74.<strong>
|
||
beta-adrenergic receptor/cAMP-mediated signaling and
|
||
apoptosis of S49 lymphoma cells.</strong> Yan L, Herrmann V, Hofer JK, Insel
|
||
PA. Department of Pharmacology, University of California, San Diego,
|
||
La Jolla, California 92093-0636, USA.<strong>
|
||
beta-Adrenergic receptor (betaAR) activation and/or increases in
|
||
cAMP regulate growth and proliferation of a variety of cells and, in
|
||
some cells, promote cell death. In the current studies we addressed
|
||
the mechanism of this growth reduction </strong>
|
||
by examining betaAR-mediated effects in the murine T-lymphoma cell line
|
||
S49. Wild-type S49 cells, derived from immature thymocytes (CD4(+)/CD8(+))
|
||
undergo growth arrest and subsequent death when treated with agents
|
||
that increase cAMP levels (e.g., betaAR agonists, 8-bromo-cAMP, cholera
|
||
toxin, forskolin). Morphological and biochemical criteria indicate that
|
||
this cell death is a result of apoptosis. In cyc(-) and kin(-) S49 cells,
|
||
which lack G(s)alpha and functional protein kinase A (PKA), respectively,
|
||
betaAR activation of G(s)alpha and cAMP action via PKA are critical
|
||
steps in this apoptotic pathway. S49 cells that overexpress Bcl-2 are
|
||
resistant to cAMP-induced apoptosis. We conclude that betaAR activation
|
||
induces apoptosis in immature T lymphocytes via G(s)alpha and PKA, while
|
||
overexpression of Bcl-2 prevents cell death. betaAR/cAMP/PKA-mediated
|
||
apoptosis may provide a means to control proliferation of immature T
|
||
cells in vivo.</p>
|
||
|
||
<p>Carcinogenesis
|
||
2001 Mar;22(3):473-9. <strong>Beta-adrenergic growth regulation of human
|
||
cancer cell lines derived from pancreatic
|
||
ductal carcinomas.</strong> Weddle DL, Tithoff P, Williams M, Schuller HM.
|
||
Carcinogenesis and Developmental Therapeutics Program, College of Veterinary
|
||
Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996,
|
||
USA. Exocrine ductal carcinoma of the pancreas has been associated with
|
||
smoking, and the tobacco-specific nitrosamine 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone
|
||
(NNK) causes this cancer type in laboratory rodents. Current knowledge
|
||
on the growth regulation of this malignancy is extremely limited. Recent
|
||
studies have shown overexpression of cyclooxygenase 2 (COX 2) and 5-lipoxygenase
|
||
(5-lipox) in exocrine pancreatic carcinomas, <strong>suggesting a potential
|
||
role of the arachidonic acid (AA) cascade in the regulation of this
|
||
cancer type. In support of this interpretation, our data show high basal
|
||
levels of AA release in two human cell lines derived from exocrine
|
||
ductal pancreatic carcinomas.</strong> Both cell lines expressed m-RNA for
|
||
beta2-adrenergic receptors and beta1-adrenergic receptors. Radio-receptor
|
||
assays showed that beta2-adrenergic receptors predominated over beta1-adrenergic
|
||
receptors. beta2-Adrenergic antagonist ICI118,551 <strong>significantly reduced
|
||
basal AA release and DNA synthesis</strong> when the cells were maintained
|
||
in complete medium. DNA synthesis of the cell line (Panc-1) with an
|
||
activating point mutation in codon 12 of the ki-ras gene was significantly
|
||
stimulated by NNK when cells were maintained in complete medium and
|
||
this <strong>response was inhibited by the
|
||
beta-blocker ICI118,551, the COX-inhibitor aspirin, or the
|
||
5-lipox-inhibitor MK-886.</strong> The cell line without ras mutations (BXPC-3)
|
||
did not show a significant response to NNK in complete medium. When
|
||
the assays were conducted in serum-free medium, both cell lines demonstrated
|
||
increased DNA synthesis in response to NNK, an effect inhibited by the
|
||
beta2-blocker, aspirin, or MK-886. Panc-1 cells were more sensitive
|
||
to the stimulating effects of NNK and less responsive to the inhibitors
|
||
than BXPC-3 cells. Our findings are in accord with a recent report which
|
||
has identified NNK as a beta-adrenergic agonist and suggest beta-adrenergic,
|
||
AA-dependent regulatory pathways in pancreatic cancer as a novel target
|
||
for cancer intervention strategies. </p>
|
||
<p>Shock
|
||
2000 Jul;14(1):60-7. Terbutaline prevents circulatory failure and mitigates
|
||
mortality in rodents with endotoxemia. Wu CC, Liao MH, Chen SJ, Chou
|
||
TC, Chen A, Yen MH. Department of Pharmacology, National Defense Medical
|
||
Center, Taipei, ROC, Taiwan. Septic shock is characterized by a decrease
|
||
in systemic vascular resistance. Nevertheless, regional increases in
|
||
vascular resistance can occur that may<strong> predispose mammals to organ
|
||
dysfunction, including the acute respiratory</strong> distress syndrome.
|
||
In the host infected by endotoxin (lipopolysaccharide, LPS), the expression
|
||
and release of proinflammatory tumor necrosis factor-alpha (TNFalpha)
|
||
rapidly increases, and this cytokine production is regulated by agents
|
||
elevating cyclic AMP. In this report, we present evidence that<strong>
|
||
|
||
terbutaline, a beta2-agonist, inhibits
|
||
TNFalpha production and enhances interleukin-10 (IL-10) release in the
|
||
anesthetized rat treated with LPS. In addition, an overproduction of
|
||
nitric oxide (NO, examined by its metabolites nitrite/nitrate) by
|
||
inducible NO synthase (iNOS, examined by western blot analysis) is attenuated
|
||
by pretreatment of LPS rats with terbutaline. Overall,</strong> pretreatment
|
||
of rats with terbutaline attenuates the delayed hypotension and prevents
|
||
vascular hyporeactivity to norepinephrine. In addition, pretreatment
|
||
of mice with terbutaline also improves the survival in a model of severe
|
||
endotoxemia. The infiltration of polymorphonuclear neutrophils into
|
||
organs (e.g., lung and liver) from the surviving LPS mice treated with
|
||
terbutaline was reduced almost to that seen in the normal controls.
|
||
These findings suggest that the inhibition of TNFalpha and NO (via iNOS)
|
||
production as well as the increment of IL-10 production contribute to
|
||
the beneficial effect of terbutaline in animals with endotoxic shock.</p>
|
||
<p>Ann
|
||
Endocrinol (Paris) 1977;38(6):421-6. [Hyperestrogenism in the woman
|
||
during the reproductive period]. [Article in French] Kuttenn F.
|
||
</p>
|
||
<p>Br
|
||
J Obstet Gynaecol 1976 Aug;83(8):593-602. Polycystic ovarian disease.
|
||
Duignan NM.<strong> Sex hormone binding globulin
|
||
(SHBG) capacity was reduced in 9 of 31 patients with
|
||
polycystic ovarian (PCO) disease and the mean level in
|
||
PCO patients was significantly less (p less than 0.001) than normal.
|
||
Serum testosterone levels</strong> were elevated in 21 of 32 PCO patients
|
||
and the mean level was significantly elevated (p less than 0.001). Serum
|
||
androstenedione values were raised in 17 of 31 patients and the mean
|
||
value was also significantly raised (p less than 0.001). Serum dehydroepiandrosterone
|
||
sulphate (DHAS) concentrations were elevated in only 2 of 14 patients.
|
||
Urinary 17-oxo and 17-oxogenic steroids were normal in all patients
|
||
studied. Basal follicle-stimulating hormone (FSH) and luteinizing hormone
|
||
(LH) levels were normal but LH release following injection of luteinizing
|
||
hormone-releasing hormone (LH-RH) was enhanced. A highly significant
|
||
negative correlation (r=--0.449; p less than 0.01) was found between
|
||
the logarithm of testosterone and the logarithm of LH levels. Serum
|
||
prolactin concentrations were elevated in 4 of 21 PCO patients. Thyroid-stimulating
|
||
hormone (TSH) values were normal. Eighteen of 20 patients ovulated following
|
||
treatment with clomiphene and nine became pregnant. Five of 12 of patients
|
||
treated with oestrogen/progesterone preparations noticed an improvement
|
||
in their hirsutism. It is<strong> suggested that the normal cyclical release
|
||
of LH is inhibited in PCO </strong>disease by a negative feedback by androgens
|
||
to the hypothalamus or the pituitary, and that wedge resection should
|
||
be reserved for patients in whom other forms of treatment have failed.</p>
|
||
|
||
<p>Nouv
|
||
Presse Med 1976 Apr 10;5(15):975-9. [Secretion of gonadotropins during
|
||
sleep. Changes during secondary amenorrheas]. [Article in French] Passouant
|
||
P, Crastes de Paulet A, Descomps B, Besset A, Billiard M. 4 females
|
||
with secondary amenorrheas underwent sleep polygraphic recordings together
|
||
with blood samples for measurements of LH, FSH and GH, 3 normal
|
||
females served as controls. Among normal subjects LH and FSH secretion
|
||
showed a pulsating pattern around the time of ovulation, appearing as
|
||
secretory episodes throughout the night, without any relationship with
|
||
sleep stages. In amenorrheas, 3 types of abnormalities could be identified:
|
||
the first was a lack<strong> of secretory episodes of
|
||
LH and FSH associated with an abnormal pattern of
|
||
GH (9 subjects). The second was an
|
||
hypersecretion of LH and a decrease of
|
||
FSH secretion together with a normal secretion of
|
||
GH in 4 subjects with a Stein-Leventhal syndrome. The last one was an
|
||
hypersecretion of LH and FSH</strong> together with a normal pattern of GH
|
||
in a subject with an early menopause. These results are discussed according
|
||
to the present data on the part of neurotransmission in the regulation
|
||
of ovulation and the 2 types of sleep. Furthermore secretory abnormalities
|
||
of LH and FSH together with a disconnection between GH secretion and
|
||
the stages of sleep lead to question the possibility of interrelationships
|
||
in the secretory mechanisms of these different hormones.
|
||
</p>
|
||
<p>Cancer
|
||
1997 Feb 1;79(3):494-9. Comment in: Cancer. 1997 Oct 1;80(7):1360-2.
|
||
Association of Stein-Leventhal syndrome with the incidence of postmenopausal
|
||
breast carcinoma in a large prospective study of women in Iowa. Anderson
|
||
KE, Sellers TA, Chen PL, Rich SS, Hong CP, Folsom AR. Division of Epidemiology,
|
||
School of Public Health, University of Minnesota, Minneapolis, USA.
|
||
BACKGROUND: The Stein-Leventhal syndrome (SLS), first described in 1935,
|
||
is characterized by infertility, hyperandrogenization, and obesity.
|
||
Because this phenotype represents an aggregation of risk factors for
|
||
postmenopausal breast carcinoma, and because in general, a hormonal
|
||
imbalance underlies the disorder, the authors examined the association
|
||
between self-reported SLS and breast carcinoma incidence in a cohort
|
||
of 34,835 cancer-free women assembled in 1986 and followed through 1992.
|
||
METHODS: All participants were between the ages of 55 and 69 and held
|
||
a valid Iowa driver's license. A total of 472 women in the cohort (1.35%)
|
||
reported a history of SLS at baseline. Incident cases of breast carcinoma
|
||
were identified annually using the State Health Registry of Iowa. Data
|
||
were analyzed using Cox proportional hazards regression. RESULTS: During
|
||
the follow-up period, there were 883 incident breast carcinomas, 14
|
||
among women reporting a history of SLS. Women with SLS were more likely
|
||
than women without SLS to report fertility problems and menstrual irregularities,
|
||
but there were no significant differences observed regarding body mass
|
||
index (BMI). Although women with SLS were 1.8 times as likely to report
|
||
benign breast disease than women without SLS (P < 0.01), they were
|
||
not more likely to develop breast carcinoma (relative risk [RR] = 1.2;
|
||
95% confidence interval [CI] = 0.7-2). Adjustment for age at menarche,
|
||
age at menopause, parity, oral contraceptive use, BMI, waist-to-hip
|
||
ratio, and family history of breast carcinoma lowered the RR to 1 (95%
|
||
CI = 0.6-1.9. CONCLUSIONS: Despite the high risk profiles of some women
|
||
with SLS, these results do not suggest that the syndrome per se is associated
|
||
with an increased risk of postmenopausal breast carcinoma.</p>
|
||
<p>Am
|
||
J Epidemiol 1991 Oct 15;134(8):818-24. Comment in: Am J Epidemiol.
|
||
1992 Aug 1;136(3):372-3. Polycystic ovaries and the risk of breast cancer.
|
||
Gammon MD, Thompson WD. Division of Epidemiology, Columbia University
|
||
School of Public Health, New York, NY. Data from a case-control study
|
||
that was conducted between 1980 and 1982 were analyzed to investigate
|
||
the possible association between polycystic ovaries and the risk of
|
||
breast cancer. The multicenter, population-based study included in-home
|
||
interviews with 4,730 women with breast cancer and 4,688 control women<strong>
|
||
|
||
aged 20-54 years. The age-adjusted odds ratio for breast cancer among
|
||
women with a self-reported history of physician-diagnosed
|
||
polycystic ovaries was 0.52 (95% confidence interval 0.32-0.87). The
|
||
inverse association was not an artifact of infertility, age at first
|
||
birth, or surgical menopause. Because women with this syndrome have
|
||
abnormal levels of certain endogenous hormones, the observation of a
|
||
low risk of breast cancer in this group may provide new insights into
|
||
hormonal influences on breast cancer.</strong></p>
|
||
<p>Clin
|
||
Endocrinol (Oxf) 1996 Mar;44(3):269-76. Polycystic ovaries in pre and
|
||
post-menopausal women. Birdsall MA, Farquhar CM. Department of Obstetrics
|
||
and Gynaecology, National Women's Hospital, Auckland, New Zealand.<strong>
|
||
OBJECTIVE: Polycystic ovaries have been diagnosed in more than 20% of
|
||
premenopausal women using ultrasound. The aim of this study was to determine
|
||
whether polycystic ovaries exist in post-menopausal women. DESIGN: Two
|
||
groups of</strong> women were studied; group 1 consisted of 18 post-menopausal
|
||
volunteers and group 2 comprised 142 women, 94 of whom were post-menopausal
|
||
who had recently undergone coronary angiography. MEASUREMENTS: Transabdominal
|
||
and transvaginal ultrasound scans were performed and measurements made
|
||
of uterine area, endometrial thickness and ovarian volume. The morphological
|
||
appearance of the ovaries was also noted. Fasting blood samples were
|
||
taken. Medical and menstrual questionnaires were completed. RESULTS:
|
||
Polycystic ovaries were found in 8/18<strong> (44%) of group 1 and 60/142
|
||
(42%) in group 2. Polycystic ovaries were detected in 35/94 (37%) of
|
||
the post-menopausal women in group 2. Post-menopausal women with
|
||
polycystic ovaries had larger ovaries containing more follicles compared
|
||
with post-menopausal women with normal ovaries. Post-menopausal women
|
||
with</strong> polycystic ovaries had higher serum concentrations of testosterone
|
||
and triglycerides than had post-menopausal women with normal ovaries.
|
||
CONCLUSIONS: Polycystic ovaries can be detected in post-menopausal women
|
||
and have some of the same endocrine abnormalities which are evident
|
||
in premenopausal women with polycystic ovaries, that is, raised serum
|
||
concentrations of testosterone and triglycerides.
|
||
</p>
|
||
<p>Cancer
|
||
Causes Control 1996 Nov;7(6):605-25. Comment in: Cancer Causes
|
||
Control. 1996 Nov;7(6):569-71. Nutrition, hormones, and breast cancer:
|
||
is insulin the missing link? Kaaks R. International Agency for Research
|
||
on Cancer, Lyon, France. Breast cancer incidence rates are high in societies
|
||
with a Western lifestyle characterized by low levels of physical activity,
|
||
and by an energy-dense diet rich in total and saturated fat and refined
|
||
carbohydrates. Epidemiologic studies, so far mostly on postmenopausal
|
||
women, have shown that breast cancer risk is increased in hyperandrogenic
|
||
women, with decreased levels of plasma sex-hormone binding globulin,
|
||
and with increased levels of testosterone and of free estrogens. This
|
||
paper describes the role of hyperinsulinemia as a hysiologic link between
|
||
nutritional lifestyle factors, obesity, and the development of a hyperandrogenic
|
||
endocrine profile, and reviews evidence that may or may not support
|
||
the theory that chronic hyperinsulinemia is an underlying cause of breast
|
||
cancer. An hypothesis is presented, stipulating that breast cancer risk
|
||
is increased not only in hyperandrogenic postmenopausal women, but also
|
||
in premenopausal women with mild hyperandrogenism and normal (ovulatory)
|
||
menstrual cycles. The author suggests further investigation as to whether
|
||
there is a positive association between risk of breast cancer before
|
||
menopause and ubclinical forms of the polycystic ovary syndrome (PCOS),
|
||
and to what extent iet and physical activity during childhood, by modulating
|
||
the degree of insulin esistance during adolescence, may or may not be
|
||
determinants of a PCO-like hyperandrogenic endocrine profile persisting
|
||
into adulthood.</p>
|
||
|
||
<p>Akush
|
||
Ginekol (Mosk) 1990 Sep;(9):61-3. [The therapeutic effect of parlodel
|
||
in the polycystic ovary syndrome]. [Article in Russian] Soboleva EL,
|
||
Komarov EK, Potin VV, Svechnikova FA. Parlodel (2.5-50 mg/day) has been
|
||
given for 1 to 7 days to 33 patients with the polycystic ovary syndrome
|
||
(POS). The ovulatory menstrual cycle returned in 10 (30%) patients and
|
||
4 of them conceived. Pretreatment cycle disturbance persisted in 6 (18%)
|
||
patients. <strong>Parlodel reduced mid-follicular mean blood
|
||
LH levels</strong> to values of normal women. Some decrease in blood testosterone
|
||
levels occurred only in the second phase of the cycle. Estradiol test
|
||
in 6 patients showed normal positive and negative feedbacks in the hypothalamic-pituitary-ovarian
|
||
axis. Parlodel treatment reduced basal and estradiol stimulated pituitary
|
||
gonadotropin secretion. It is suggested that parlodel may be used in
|
||
ovulation induction in a proportion of POS patients.
|
||
</p>
|
||
<p>polycystic
|
||
menopausal sympathetic
|
||
estrogen parasympathetic, antimitochondrial, both can have a protective
|
||
function, though in excess the inhibition itself is toxic.</p>
|
||
<p>
|
||
|
||
</p>
|
||
<p>Mast
|
||
cells: hair growth, angiogenesis, cancer, MS, asthma. Nervous control
|
||
of insulin,7: </p>
|
||
<p>Am
|
||
J Obstet Gynecol 1993 Nov;169(5):1223-6. Comment in: Am J Obstet
|
||
Gynecol. 1994 Dec;171(6):1673 <strong>Excessive
|
||
estradiol secretion in polycystic ovarian disease.</strong> Benjamin F, Toles
|
||
AW, Seltzer VL, Deutsch S. Department of Obstetrics and Gynecology,
|
||
Queens Hospital Center, Jamaica, NY 11432. Polycystic ovarian disease
|
||
is both a hyperestrogenic and a hyperandrogenic syndrome, and all studies
|
||
have shown that hyperestrogenemia is the result of an elevation of estrone
|
||
with plasma estradiol levels in the normal follicular range. Because
|
||
a literature search failed to reveal any report of polycystic ovarian
|
||
disease with significantly elevated estradiol levels, we report a case
|
||
in which the plasma estradiol was so massively elevated as to mimic
|
||
an estrogen-producing neoplasm. This case also suggests that although
|
||
polycystic ovarian disease is a very rare cause of such excessive estradiol
|
||
production, it should be included in the differential diagnosis of estrogen-producing
|
||
neoplasms.</p>
|
||
<p>Nephron 1983;33(4):253-6. <strong>Influence of
|
||
inhibitor of glucose utilization on the blood platelet function.</strong>
|
||
Tison P, Kubisz P, Cernacek P, Dzurik R. The <strong>inhibition of
|
||
glycolysis</strong> by an inhibitor of glucose utilization isolated from
|
||
urine of the uremic subjects reflects in: (1) decreased platelet<strong>
|
||
|
||
aggregation induced by adenosine diphosphate, adrenaline, or collagen,</strong>
|
||
respectively; (2) decreased platelet factor 4 release induced by the
|
||
same inductors; (3) decreased availability of platelet factor 3, and
|
||
(4) inhibition of retraction of reptilase clot. It is concluded that
|
||
the inhibition of glycolysis by 'inhibitor of glucose utilization' contributes
|
||
to the functional changes of platelets and thus to the alteration of
|
||
hemostasis in uremic patients.</p>
|
||
<p>Energy:
|
||
vasodilate, bronchoconstrict, secrete/leak, swell, grow, tumefy. Invasion
|
||
by sympathetic balances the chronic stimulation by mast cells, platelets,
|
||
pituitary hormones, locally formed estrogen, and the other mediators
|
||
of stress.</p>
|
||
<p>Res
|
||
Exp Med (Berl) 1987;187(5):385-93. <strong>Possible interaction of platelets
|
||
and adrenaline in the early phase of myocardial infarction.</strong> Seitz
|
||
R, Leising H, Liebermann A, Rohner
|
||
|
||
I, Gerdes H, Egbring R. <strong>It is known that in most cases of
|
||
transmural acute myocardial infarction a platelet clot originates within
|
||
a coronary artery. In acute myocardial infarction patients increased
|
||
levels of the plasma catecholamines adrenaline and
|
||
noradrenaline as well as the platelet release proteins platelet factor
|
||
4 and beta-thromboglobulin have been reported. </strong>
|
||
In this study, significantly higher values were found of platelet factor
|
||
4 (P less than 0.0001) and beta-thromboglobulin (P less than 0.002)
|
||
in 17 acute myocardial infarction patients as compared to 17 control
|
||
patients (on intensive care due to non-cardiac disorders), while the
|
||
plasma levels of adrenaline and noradrenaline were not different. Positive
|
||
correlations were obtained between the two catecholamines and the platelet
|
||
products in the control group and between adrenaline and both platelet
|
||
factor 4 (r = 0.715, P less than 0.01) and beta-thromboglobulin (r =
|
||
0.547, P less than 0.05) in the acute myocardial infarction patients.
|
||
The data suggest that a stimulation of the platelets by adrenaline may
|
||
facilitate in vitro activation during sampling in patients with high
|
||
catecholamine load. On the other hand, a "preactivation" of
|
||
the platelets by an increase of adrenaline might be of significance
|
||
for thrombus formation in acute myocardial infarction.</p>
|
||
<p>Anesthesiology
|
||
1991 Jun;74(6):973-9. Comment in: Anesthesiology. 1992 Mar;76(3):475.
|
||
Magnesium inhibits the hypertensive but not the cardiotonic actions
|
||
of low-dose epinephrine. Prielipp RC, Zaloga GP, Butterworth JF 4th,
|
||
Robertie PG, Dudas LM, Black KW, Royster RL. Intravenous magnesium supplementation
|
||
is often used to control cardiac arrhythmias and coronary artery vasospasm
|
||
resulting from disturbances of magnesium homeostasis after coronary
|
||
artery bypass surgery. Many such patients also require inotropic drug
|
||
support of depressed myocardial function. However, increased serum magnesium
|
||
concentrations directly depress cardiac contractility in animals and
|
||
may interfere with catecholamine actions. To determine whether small
|
||
intravenous doses of magnesium sulfate (MgSO4) interfere with the cardiotonic
|
||
actions of epinephrine, we examined the hemodynamic effects of MgSO4
|
||
and epinephrine infusion in 17 cardiac surgical patients on their 1st
|
||
postoperative day in a prospective, controlled study. In 11 patients,
|
||
infusion of MgSO4 (7-mg.kg-1 bolus followed by 10 mg.kg-1.h-1 as a continuous
|
||
infusion) increased serum magnesium concentrations by 44% (mean +/-
|
||
standard error of the mean [SEM] of 0.8 +/- 0.1 to 1.2 +/- 0.1 mM; P
|
||
less than 0.01) but had no significant effect on heart rate; mean arterial,
|
||
central venous, or pulmonary arterial occlusion pressures; or cardiac
|
||
output. Epinephrine infusion (30 ng.kg-1.min-1) significantly increased
|
||
cardiac index (2.7 +/- 0.1 to 3.1 +/- 0.21.min-1.m-2; P less than 0.05);
|
||
this effect was not altered by MgSO4 administration (n = 11). However,
|
||
MgSO4 significantly blunted epinephrine's hypertensive action and prevented
|
||
a significant increase in mean arterial pressure during concurrent MgSO4-epinephrine
|
||
administration. Six placebo control patients were given two sequential
|
||
infusions of epinephrine separated by a placebo infusion to rule out
|
||
an effect of time on the hemodynamic response to epinephrine. Mean arterial
|
||
pressure and cardiac index responses to epinephrine were identical before
|
||
and after placebo infusion.(</p>
|
||
<p>Jpn
|
||
Heart J 1979 Jan;20(1):75-82. <strong>Inhibition of constrictor responses
|
||
of dog coronary artery by atropine. A possible effectiveness of atropine
|
||
on variant form of angina pectoris.</strong> Sakanashi M, Furukawa T, Horio
|
||
Y. A possible effectiveness of atropine on variant form of angina pectoris
|
||
was investigated using the left circumflex coronary arterial strips
|
||
of dogs. Acetylcholine 10(-5)--10(-3) Gm/ml dose-dependently constricted
|
||
the isolated arterial strips during potassium-contracture in 6 cases,
|
||
and repetitive applications of acetylcholine could produce the similar
|
||
contractions to the control. In 18 strips atropine 10(-6) Gm/ml significantly
|
||
depressed the contractions of coronary arteries induced by acetylcholine
|
||
10(-5)--10(-3) Gm/ml. In 5 arterial strips atropine 10(-6) Gm/ml <strong>
|
||
|
||
significantly inhibited norepinephrine-induced responses</strong> of these
|
||
arteries, and by 10(-5) Gm/ml further suppression of the responses was
|
||
obtained. The <strong>results suggest that atropine may suppress the contractile
|
||
responses of the coronary artery induce by
|
||
acetylcholine and nonrepinephrine through a
|
||
muscarinic-receptor blocking action and simultaneously partly through
|
||
an adrenergic alpha-receptor blocking action.</strong></p>
|
||
<p>Eur
|
||
J Clin Pharmacol 1981;20(4):245-50. <strong>Effect of long-term beta-blockade
|
||
with alprenolol on platelet function and
|
||
fibrinolytic activity in patients with coronary heart disease.</strong> Jurgensen
|
||
HJ, Dalsgaard-Nielsen J, Kjoller E, Gormsen J. In 14 patients with coronary
|
||
heart disease the effect of long-term treatment (mean 16 months, range
|
||
12-33) with alprenolol on platelet function and fibrinolytic activity
|
||
was studied. While on the beta-blocker and two weeks after gradual withdrawal
|
||
of it, the patients performed a bicycle-ergometer test and blood samples
|
||
were obtained before and following exercise. Pre-exercise fibrinolytic
|
||
activity, assessed by the euglobulin clot lysis time, was 183 +/- 27
|
||
min (mean +/- SEM) while on alprenolol as compared to 111 +/- 18 min
|
||
(p less than 0.01) after its withdrawal. Activation of fibrinolysis
|
||
following exercise was not significantly influenced by alprenolol. In
|
||
patients treated with alprenolol, the pre-exercise threshold level of
|
||
ADP, producing platelet aggregation was 3.3 muM (geometric mean) and
|
||
5.1 muM after stopping treatment (p less than or equal to 0.05). In
|
||
patients receiving the beta-blocker, the ADP- threshold value dropped
|
||
from 3.3 muM before exercise to 2.3 muM immediately after exercise (not
|
||
significant). The corresponding values after withdrawal of alprenolol
|
||
were 5.1 muM and 2.7 muM (p less than or equal to 0.02). Adrenaline
|
||
- stimulated aggregation was not significantly influenced by alprenolol.
|
||
Serotonin release from platelets following maximal ADP- and adrenaline
|
||
stimuli was not significantly changed by exercise in patients on beta-blockade.
|
||
After stopping treatment, ADP-induced serotonin release was 22 +/- 4.1%
|
||
before and 15 +/- 4.7% after exercise (p less than 0.02). the corresponding
|
||
values using the adrenaline stimulus were 29 +/- 5.7% and 17 +/- 4.7%
|
||
(p less than 0.05). It is suggested that during physical stress alprenolol
|
||
may protect platelets against aggregatory stimuli.</p>
|
||
<p>C
|
||
R Seances Soc Biol Fil 1987;181(3):242-8.<strong> [Adrenaline activates oxidative
|
||
phosphorylation of rat liver mitochondria through alpha 1-receptors].</strong>
|
||
Breton L, Clot JP, Bouriannes J, Baudry M. We studied the effects and
|
||
mode of action of epinephrine on the oxidative phosphorylation of rat
|
||
liver mitochondria. With either succinate or beta-hydroxybutyrate as
|
||
substrate, i.v. injection of 1.5 microgram/100 g epinephrine increased
|
||
the respiratory rates by 30-40% in state 3 (with ADP), and by 20-30%
|
||
in state 4 (after ADP phosphorylation), so that the respiratory control
|
||
ratio (state 3/state 4) changed little. The respiratory stimulation
|
||
by epinephrine was maximal 20 minutes after its injection. The action
|
||
of epinephrine on mitochondria was blocked by pretreatment of the animals
|
||
with the alpha 1-antagonist prazosin but not by treatment with the beta-antagonist
|
||
propranolol. I. v. injection of 10 micrograms/100 g phenylephrine evoked
|
||
the same mitochondrial response as epinephrine. I. v. administration
|
||
of 50 micrograms/100 g dibutyryl cyclic AMP enhanced glycaemia but did
|
||
not affect mitochondrial respiration. Epinephrine therefore has an alpha
|
||
1-type of action on mitochondrial oxidative phosphorylation.</p>
|
||
|
||
<p>Biochimie
|
||
1975;57(6-7):797-802. <strong>Effects of
|
||
catecholamines on rat myocardial metabolism. I. Influence of
|
||
catecholamines on energy-rich nucleotides and
|
||
phosphorylated fraction contents.</strong> Merouze P, Gaudemer Y. 1. The
|
||
influence of catecholamines (adrenaline and noradrenaline) on energy
|
||
metabolism of the rat myocardium has been studied by incubating slices
|
||
of this tissue with these hormones and by following the levels of the
|
||
different phosphorylated fractions and adenylic nucleotides. 2. Similar
|
||
effects are obtained with both hormones, adrenaline being more effective.
|
||
3<strong>. Catecholamines decrease significantly the total amount of phosphate
|
||
while Pi content increases during the first 10 minutes of incubation;
|
||
labile and residual phosphate contents increase at the beginning of
|
||
incubation and decrease to the initial values afterwards. 4. ATP and
|
||
ADP levels decrease significantly</strong> with both hormones; however, the
|
||
effect of noradrenalin on the ATP level needs a longer time of incubation. <strong>
|
||
The ATP/ADP ratios decrease after 5 minutes incubation and the total
|
||
adenylic nucleotide content is severely decreased (35 per cent with
|
||
adrenalin, after 20 minutes incubation). 5. Similar results have been
|
||
obtained with other tissues; these results can explain the decrease
|
||
of aerobic metabolism we observed under the same conditions.</strong></p>
|
||
<p>Eur
|
||
J Pharmacol 1982 Jul 30;81(4):569-76<strong>. Actions of
|
||
serotonin antagonists on dog coronary artery.</strong> Brazenor RM, Angus
|
||
JA. Serotonin released from platelets may initiate coronary vasospasm
|
||
in patients with variant angina. If this hypothesis is correct, serotonin
|
||
antagonists without constrictor activity may be useful in this form
|
||
of angina. We have investigated drugs classified as serotonin antagonists
|
||
on dog circumflex coronary artery ring segments in vitro. Ergotamine,
|
||
dihydroergotamine,<strong> bromocriptine,
|
||
lisuride, ergometrine, ketanserin,
|
||
trazodone, cyproheptadine and pizotifen caused
|
||
non-competitive antagonism of serotonin concentration-response</strong> curves.
|
||
In addition, ketanserin, trazodone, bromocriptine and pizotifen inhibited
|
||
noradrenaline responses in concentrations similar to those required
|
||
for serotonin antagonism. All drugs with the exception of ketanserin,
|
||
cyproheptadine and pizotifen showed some degree of intrinsic constrictor
|
||
activity. Methysergide antagonized responses to serotonin competitively
|
||
but also constricted the coronary artery. The lack of a silent competitive
|
||
serotonin antagonist precludes a definite characterization of coronary
|
||
serotonin receptors at this time. However, the profile of activity observed
|
||
for the antagonist drugs in the coronary artery differs from that seen
|
||
in other vascular tissues. Of the<strong> drugs tested,
|
||
ketanserin may be the most useful in variant angina since it is a potent
|
||
5HT antagonist, lacks agonist activity and has
|
||
alpha-adrenoceptor blocking activity.</strong></p>
|
||
|
||
<p>Arch
|
||
Mal Coeur Vaiss 1983 Feb;76 Spec No:3-6.<strong> Role of autonomic nervous
|
||
system in the pathogenesis of angina pectoris.</strong> Yasue H. The attacks
|
||
of vasospastic angina or coronary spasm can be induced by injection
|
||
of epinephrine, cold pressor test, Valsalva maneuver, and exercise.
|
||
The attacks induced by these procedures can be suppressed by injection
|
||
of phentolamine, an alpha adrenergic blocking agent in 80 per cent of
|
||
the patients. On the other hand, propranolol, a beta adrenergic blocking
|
||
agent, is not only ineffective in suppressing the attacks but aggravates
|
||
the attacks in 50 per cent of the patients. Thus, alpha adrenergic receptors
|
||
seem to play an important role in the production of vasospastic angina.
|
||
The attacks of vasospastic angina can also be induced by injection of
|
||
methacholine, a parasympathomimetic agent, and this reaction is suppressed
|
||
by atropine, a parasympathetic blocking agent. Thus,<strong> parasympathetic
|
||
nervous system also seems to play a role in the production of
|
||
vasospastic angina. The attacks of
|
||
vasospastic angina can be easily induced by
|
||
adrenergic or parasympathetic stimuli from midnight to early morning
|
||
but is</strong> usually not provoked by these stimuli in the daytime. Thus,
|
||
there is circadian variation in the reactivity of coronary arteries
|
||
to adrenergic or parasympathetic stimuli. There are also weekly, monthly
|
||
and yearly variations of the reactivity of coronary arteries to these
|
||
stimuli. Thus, <strong>alpha adrenergic or parasympathetic activity is not
|
||
the sole factor in the production of
|
||
vasospastic angina.</strong> Angina pectoris caused by increased myocardial
|
||
oxygen demand is induced by infusion of isoproterenol, a beta adrenergic
|
||
stimulant, and is suppressed by propranolol but not by phentolamine.
|
||
So, beta adrenergic receptors play an important role in the production
|
||
of angina pectoris caused by increased myocardial oxygen demand or organic
|
||
angina pectoris.</p>
|
||
<p>Nippon
|
||
Yakurigaku Zasshi 1986 Mar;87(3):281-90. [Vasoconstrictor responses
|
||
of isolated pig coronary arteries]. [Article in Japanese] Ikenoue K,
|
||
Kawakita S, Toda N.<strong> In helical strips of pig coronary arteries, histamine,
|
||
serotonin, acetylcholine and a stable analogue of
|
||
thromboxane A2 (9, 11-epithio-11, 12-methano
|
||
TXA2: s-TXA2) produced a dose-dependent contraction. The histamine-induced
|
||
contraction</strong> was suppressed by treatment with chlorpheniramine, suggesting
|
||
an involvement of H1 receptors. Contractile responses to serotonin were
|
||
attenuated by not only ketanserin, an S2 antagonist, but also by cinanserin
|
||
and methysergide. Relaxation induced by serotonin in preparations treated
|
||
with high concentrations of ketanserin were inhibited by cinanserin
|
||
and methysergide. Norepinephrine contracted coronary arteries treated
|
||
with propranolol. Contractile responses to norepinephrine were reversed
|
||
to relaxations by prazosin, which were abolished by treatment with yohimbine.
|
||
Contractile responses to histamine were potentiated by treatment with
|
||
low concentrations of serotonin or s-TXA2. Contractile responses to
|
||
serotonin were also potentiated by low concentrations of histamine or
|
||
s-TXA2. Removal of the endothelium from pig coronary arterial strips
|
||
potentiated contractions induced by serotonin, histamine and norepinephrine.
|
||
These results suggest that, in addition to damaged endothelium, integrating
|
||
action of endogenous vasoconstrictors, including histamine, serotonin,
|
||
TXA2 and norepinephrine, may play an important role in producing coronary
|
||
vasospasm.</p>
|
||
|
||
<p>Jpn
|
||
Heart J 1987 Sep;28(5):649-61<strong>. The role of parasympathetic nerve
|
||
activity in the pathogenesis of coronary
|
||
vasospasm.</strong> Suematsu M, Ito Y, Fukuzaki H. To evaluate the role of
|
||
the autonomic nervous system, especially the parasympathetic nervous
|
||
system, in the initiation mechanism of vasospastic angina pectoris (AP),
|
||
the coefficient of R-R interval variation (CV) on the electrocardiogram
|
||
(ECG) and plasma catecholamine concentration were measured in 25 patients
|
||
with vasospastic AP, 10 patients with effort AP and 12 control subjects.
|
||
CV which has been recognized as reflecting parasympathetic nervous system
|
||
activity was calculated from 100 consecutive heart beats on the ECG
|
||
and represented as the percentage of standard deviation of the R-R interval
|
||
per mean R-R interval. Repeated measurements of <strong>plasma
|
||
catecholamine concentration revealed higher values at any sampling point
|
||
throughout a day in patients with vasospastic AP than those in </strong>
|
||
control subjects. A distinctly higher CV was observed at night in the
|
||
vasospastic AP group. <strong>This elevated CV was abolished by atropine
|
||
sulfate (1.5 mg/day per os). Pilocarpine injection (1.3 mg/10 kg
|
||
B.W. subcutaneously) induced a marked increase</strong> in CV that preceded
|
||
the occurrence of chest pain and/or ischemic ECG changes in 5 patients
|
||
with vasospastic AP. The<strong> increment in CV at 10 min after
|
||
pilocarpine administration was greater in
|
||
vasospastic AP than in control subjects (p less than 0.05). It is concluded
|
||
that enhanced parasympathetic activity may play a role in the initiation
|
||
of coronary vasospasm associated with sympathetic hyperactivity.</strong></p>
|
||
<p>Science
|
||
1984 Mar 30;223(4643):1435-7.<strong> Coronary arteries of cardiac patients
|
||
are hyperreactive and contain stores of amines: a mechanism
|
||
for coronary spasm.</strong> Kalsner S, Richards R. Coronary arteries from
|
||
hearts of cardiac patients contain significantly higher concentrations
|
||
of histamine than do those from noncardiac patients. The coronary vessels
|
||
of cardiac patients are also hyperresponsive to histamine and serotonin.
|
||
These differences between groups of patients suggest an explanation
|
||
for coronary artery spasm in heart disease.</p>
|
||
|
||
<p>Fed
|
||
Proc 1985 Feb;44(2):321-5. <strong>Coronary artery reactivity in human vessels:
|
||
some questions and some answers.</strong> Kalsner S. Spasm of a conduit coronary
|
||
artery, converting it into a major resistance vessel impeding myocardial
|
||
blood flow, may have severe short- or long-term effects on cardiac rhythm
|
||
and systolic ejection of blood. It is now clear that human coronary
|
||
arteries in vitro contract to acetylcholine but that relaxation is the
|
||
only response observed in dog coronary vessels. <strong>Acetylcholine is
|
||
as powerful a constrictor of human coronary arteries, in terms of tension
|
||
induced, as 5-hydroxytryptamine (5-HT) or histamine and is a substantially
|
||
more powerful constrictor than norepinephrine.</strong> Field stimulation
|
||
of coronary artery strips caused a vasoconstriction that was partially
|
||
antagonized by atropine (3.45 X 10(-6) M). An enhanced reactivity of
|
||
the epicardial arteries of cardiac and older patients to several agonists
|
||
was also observed and appears to provide a background against which
|
||
a number of vasoactive agents might induce spasm. Coronary tissue from
|
||
cardiac patients also contains stores of 5-HT and histamine, and the
|
||
histamine levels are substantially increased above the values in vessels
|
||
from noncardiac patients. Coronary artery spasm or contraction<strong> probably
|
||
can be initiated by diverse intrinsic and extrinsic influences, including
|
||
autonomic discharge from either the parasympathetic or sympathetic nervous
|
||
system or from histamine or 5-HT, and probably no one agent or entity
|
||
is causative in all cases.</strong></p>
|
||
<p>Ann
|
||
N Y Acad Sci 1969 Oct 14;164(2):517-9. <strong>Induced
|
||
carcinogenesis under various influences on the hypothalamus.</strong> Kavetsky
|
||
RE, Turkevich NM, Akimova RN, Khayetsky IK, Matveichuck YD.</p>
|
||
|
||
<p>Ann
|
||
N Y Acad Sci 1966 Jan 21;125(3):933-45. <strong>On the
|
||
psychophysiological mechanism of the organism's resistance to tumor
|
||
growth.</strong> Kavetsky RE, Turkevich NM, Balitsky KP.</p>
|
||
<p>Patol
|
||
Fiziol Eksp Ter 1971 Sep-Oct;15(5):3-10. [Role of disorders in intra-cellular
|
||
and neuro-humoral regulation in the development of the tumor process].
|
||
[Article in Russian] Kavetskii RE, Balitskii KP.</p>
|
||
<p>Obstet
|
||
Gynecol Surv 1977 May;32(5):267-81. <strong>Estrogen and
|
||
endometrial carcinoma. </strong>Knab DR. 1. It has become evident that the
|
||
estrogen secreting tumors of the ovary are associated with endometrial
|
||
carcinoma, but this association is most easily observed in the postmenopausal
|
||
patient where the incidence of carcinoma has been<strong> reported at 10.3%
|
||
(1. 02) to 24% (83). 2. The most consistent association of
|
||
endometrial carcinoma is with polycystic ovarian disease, where 19 (34),
|
||
21 (152), and 25% (150) of young women with
|
||
endometrial carcinoma had Stein-Leventhal syndrome (67). 3. A very significant
|
||
discovery became known in</strong> 1967 when the peripheral aromatization
|
||
of delta4 androstenedione to estrone was reported by Kase (94) and MacDonald
|
||
(111,112). Since that time we have learned that endometrial carcinoma
|
||
patients have an <strong>increased peripheral conversion (139) (0.1% compared
|
||
to 0.027%), which is similar to that found in obese and aging patients,
|
||
by Hemsell, et al (77).</strong> This can be 2 to 4 times greater than the
|
||
young adult or the patient without cancer. Estrone produced peripherally
|
||
in normal postmenopausal women can amount to 40-60 microng/day and rise
|
||
as high as 120-180 microng/day in the endometrial neoplasia group (39).
|
||
Similarly patients with polycystic ovary disease, hyperthecosis and
|
||
lipoid cell tumors of the ovary demonstrate androgen excess with extraglandular
|
||
conversion to estrone (2). 4. It has become apparent that the principal
|
||
estrogen in the postmenopausal patient is estrone and that the <strong>estrone-estradiol
|
||
ratio in the serum is higher in postmenopausal women with corpus cancer
|
||
than similar patients without cancer</strong> (135). Clearly, we must find
|
||
the effect of this estrone excess at the nuclear "acceptor"
|
||
|
||
level; and does this imbalance create a hormonal environment conducive
|
||
to the development of endometrial carcinoma when age (an extremely important
|
||
factor) and an oncogenic agent are added? 5. With the lack of ovarian
|
||
estrogen there is a relative excess of adrenal testosterone, dihydrotestosterone
|
||
and delta4 androstenedione, the available precursors of extraglandular
|
||
estrone (1). 6. With the passage of time <strong>it appears that
|
||
endometrial carcinoma is associated with hypothalamic "hyperactivity"</strong>
|
||
(31) which exhibits immunologic-biologic dissociation of LH as previously
|
||
observed in persistent trophoblastic disease when measuring hCG. The
|
||
significance of this is still unknown. In a like fashion a significant
|
||
number of the at risk polycystic ovary disease patients have an increased
|
||
LH secretion. 7. Patient susceptibility is required as seen in animal
|
||
experiments where prolonged administration of stilbestrol is used and
|
||
still only rabbits and mice developed a malignant change. 8. Long term
|
||
exogenous estrogen appears to have caused malignant changes in the endometrium,
|
||
but it was universally given over a prolonged period (4 or more
|
||
years). The recent retrospective studies demonstrate an association
|
||
of oral estrogen therapy with endometrial cancer, but prospective studies
|
||
investigating dose and duration of all estrogen preparations need to
|
||
be undertaken. 9...</p>
|
||
<p>Endocrinology
|
||
2000 Mar;141(3):1059-72.<strong> An increased
|
||
intraovarian synthesis of nerve growth factor and its low affinity receptor
|
||
is a principal component of steroid-induced
|
||
polycystic ovary in the rat.</strong> Lara HE, Dissen GA, Leyton V, Paredes
|
||
A, Fuenzalida H, Fiedler JL, Ojeda SR. A form of polycystic ovary (PCO)
|
||
resembling some aspects of the human PCO syndrome can be induced in
|
||
rats by a single injection of estradiol valerate (EV). An increase in
|
||
sympathetic outflow to the ovary precedes, by several weeks, the appearance
|
||
of cysts, suggesting the involvement of a neurogenic component in the
|
||
pathology of this ovarian dysfunction. The present study was carried
|
||
out to test the hypotheses that this change in sympathetic tone is related
|
||
to an augmented production of ovarian nerve growth factor (NGF), and
|
||
that this abnormally elevated production of <strong>NGF contributes to the
|
||
formation of ovarian cysts induced by
|
||
EV. Injection of the steroid resulted in increased
|
||
intraovarian synthesis of NGF</strong> and its low affinity receptor, p75
|
||
NGFR. The increase was maximal 30 days after EV, coinciding with the
|
||
elevation in sympathetic tone to the ovary and preceding the appearance
|
||
of follicular cysts. Intraovarian injections of the retrograde tracer
|
||
fluorogold combined with in situ hybridization to detect tyrosine hydroxylase
|
||
(TH) messenger RNA-containing neurons in the celiac ganglion revealed
|
||
that these changes in NGF/p75 NGFR synthesis are accompanied by selective
|
||
activation of noradrenergic neurons projecting to the ovary. The levels
|
||
of RBT2 messenger RNA, which encodes a beta-tubulin presumably involved
|
||
in slow axonal transport, were markedly elevated, indicating that EV-induced
|
||
formation of ovarian cysts is preceded by functional activation ofceliac
|
||
ganglion neurons, including those innervating the ovary. Intraovarian
|
||
administration of a neutralizing antiserum to NGF in conjunction with
|
||
an antisense oligodeoxynucleotide to p75 NGFR, via Alzet osmotic minipumps, <strong>
|
||
restored estrous cyclicity and ovulatory capacity in a</strong> majority
|
||
of EV-treated rats. These functional changes were accompanied by restoration
|
||
of the number of antral follicles per ovary that had been depleted by
|
||
EV and a significant reduction in the number of both precystic follicles
|
||
and<strong> follicular cysts. The results indicate that the
|
||
hyperactivation of ovarian sympathetic nerves seen in
|
||
EV-induced PCO is related to an overproduction of
|
||
NGF and its low affinity receptor in the gland. They also suggest that
|
||
activation of this neurotrophic-neurogenic regulatory loop is a component
|
||
of the pathological process by which
|
||
EV induces cyst formation and anovulation in rodents. The</strong> possibility
|
||
exists that a similar alteration in neurotrophic input to the ovary
|
||
contributes to the etiology and/or maintenance of the PCO syndrome in
|
||
humans.</p>
|
||
|
||
<p>Acta
|
||
Physiol Hung 1996;84(2):183-90.<strong> Effects of hormones on the number,
|
||
distribution and degranulation of mast cells in the ovarian complex
|
||
of mice.</strong> Jaiswal K, Krishna A. The changes in the number and degranulation
|
||
pattern of mast cells varied with the types of hormonal treatment and
|
||
ovarian compartment. <strong>Luteinizing hormone
|
||
(LH), follicle stimulating hormone
|
||
(FSH), thyroid stimulating hormone
|
||
(TSH) and 17-beta estradiol (E2) treatment caused increase (P < 0.05)
|
||
in the number of mast cells</strong> in the hilum as compared with the controls.
|
||
Increase (P < 0.05) in the number of mast cells in the whole ovarian
|
||
complex was observed only following FSH and E2 treatment. All the hormones
|
||
used in the present study increased the percentage degranulation of
|
||
mast cells in the hilum. However, only LH, FSH and E2 increased the
|
||
percentage degranulation of mast cells in other compartments of the
|
||
ovary (medulla, bursa and cortex). TSH and ACTH failed to cause any
|
||
increase in the percentage degranulation of mast cells in these compartments.
|
||
The present findings indicate E2 to be the most potent among the hormones
|
||
tested in causing degranulation of mast cells in all ovarian compartments.</p>
|
||
<p>Fertil
|
||
Steril 2001 Jun;75(6):1141-7. <strong>Increase in nerve fibers and loss of
|
||
mast cells in polycystic and postmenopausal ovaries.</strong> Heider U, Pedal
|
||
I, Spanel-Borowski K. OBJECTIVE: To quantify nerve fibers and mast cells
|
||
in human ovaries at different functional stages. DESIGN: Retrospective
|
||
study. SETTING: Research laboratory of the university. SPECIMEN(S):
|
||
8 human ovaries in the follicular (cyclic) phase, 7 polycystic ovaries,
|
||
and postmenopausal ovaries with (n=5) or without (n=7) hyperthecosis.
|
||
MAIN OUTCOME MEASURE(S): Single- and double immunohistology for the
|
||
S100 antigen in glial cells of autonomic nerve fibers, for chymase and
|
||
tryptase in mast cells, and for the common leukocyte antigen on leukocytes.
|
||
Histometric evaluation was also performed. INTERVENTION(S): None. RESULT(S):
|
||
Polycystic ovaries contained significantly more S100-positive nerve
|
||
fibers in the corticomedullary region than did cyclic ovaries (mean
|
||
+/- SD per 2-mm(2) area, 476 +/- 136 and 224 +/- 133; P<.01). Postmenopausal
|
||
ovaries with or without hyperthecosis had the highest density of nerve
|
||
fibers. In cyclic and polycystic ovaries, more tryptase-positive mast
|
||
cells than chymase-positive mast cells were found in the interstitial
|
||
cortex and the medulla. In cyclic ovaries, areas with a moderate density
|
||
of nerve fibers contained many mast cells. Hence, <strong>with increasing
|
||
nerve fiber density in polycystic ovaries, the number of mast cells
|
||
decreased strikingly compared with cyclic ovaries (p<.001). Almost
|
||
no mast cells were seen in postmenopausal ovaries</strong> with and without
|
||
hyperthecosis. The number of leukocyte antigen-positive leukocytes was
|
||
similar in all groups. CONCLUSION(S): The high density of nerve fibers
|
||
in polycystic and postmenopausal ovaries, together with a conspicuous
|
||
decrease in mast cells, indicates altered neuroimmune communication.</p>
|
||
|
||
<p>Endocrinology
|
||
1993 Dec;133(6):2696-703. <strong>Ovarian
|
||
steroidal response to gonadotropins and
|
||
beta-adrenergic stimulation is enhanced in
|
||
polycystic ovary syndrome: role of sympathetic
|
||
innervation.</strong> Barria A, Leyton V, Ojeda SR, Lara HE. Experimental
|
||
induction of a polycystic ovarian syndrome (PCOS) in rodents by the<strong>
|
||
administration of a single dose of
|
||
estradiol valerate (EV) results in activation of the peripheral sympathetic
|
||
neurons that innervate the ovary. This activation is evidenced by an
|
||
increased capacity of ovarian nerve terminals to incorporate and release
|
||
norepinephrine (NE), an increase in ovarian NE content, and a</strong> decrease
|
||
in ovarian beta-adrenergic receptor number in the ovarian compartments
|
||
receiving catecholaminergic innervation. The present experiments were
|
||
undertaken to <strong>examine the functional consequences of this enhanced
|
||
sympathetic outflow to the ovary.</strong> The steroidal responses of the
|
||
gland to beta-adrenergic receptor stimulation and hCG were examined
|
||
in vitro 60 days after EV administration, i.e. at the time when follicular
|
||
cysts are well established. EV-treated rats exhibited a remarkable increase
|
||
in ovarian progesterone and androgen responses to isoproterenol, a beta-adrenergic
|
||
receptor agonist, with no changes in estradiol responsiveness. Basal
|
||
estradiol release was, however, 50-fold higher than the highest levels
|
||
released from normal ovaries at any phase of the estrous cycle. The
|
||
ovarian progesterone and androgen responses to hCG were enhanced in
|
||
EV-treated rats, as were the responses to a combination of isoproterenol
|
||
and hCG. Transection of the superior ovarian nerve (SON), which carries
|
||
most of the catecholaminergic fibers innervating endocrine ovarian cells,
|
||
dramatically reduced the exaggerated responses of all three steroids
|
||
to both beta-adrenergic and gonadotropin stimulation. SON transection
|
||
also reduced the elevated levels of ovarian NE resulting from EV treatment
|
||
and caused up-regulation of beta-adrenoreceptors. Most importantly,
|
||
SON transection restored estrous cyclicity and ovulatory capacity. The
|
||
results indicate that the increased output of ovarian steroids in PCOS
|
||
is at least in part due to an enhanced responsiveness of the gland to
|
||
both catecholaminergic and gonadotropin stimulation. The ability of
|
||
SON transection to restore a normal response indicates that the alteration
|
||
in steroid output results from a deranged activation of selective components
|
||
of the noradrenergic innervation to the ovary. These findings support
|
||
the concept that an alteration in the neurogenic control of the ovary
|
||
contributes to the etiology of PCOS.
|
||
</p>
|
||
</small>
|
||
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