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The Prostaglandins (Paperback, Softcover reprint of the original 1st ed. 1974)
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Discovery Miles 15 760
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The Prostaglandins (Paperback, Softcover reprint of the original 1st ed. 1974)
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There is much evidence to suggest that prostaglandins may have a
physiological role to play in the control of thyroid gland
metabolism, although the precise nature of this role remains to be
defined. Prostaglandins have been found in normal thyroid tissue,
and there is evidence of increased levels in some, but not all,
cases of medullary carcinoma of the thyroid. which may account for
the associated diarrhea. Exogenous prostaglandins, like TSH, bind
to thyroid plasma mem branes, stimulate the adenylate
cyclase-cyclic AMP system, thyroid hormone secretion, iodide
organification, colloid droplet formation, glucose oxidation, and
32p incorporation into phospholipids. Prosta glandins of the E
series are the most potent, although their maximal effects are
generally less than the maximal effects of TSH. The
interrelationships existing between TSH and prostaglandins have
been the subject of intensive investigation, but as yet no one uni
fying concept has emerged. TSH and prostaglandins have been shown
to occupy different receptors on the thyroid plasma membrane. Al
though TSH can increase intracellular prostaglandin levels,
probably as a result of increased synthesis, prostaglandins do not
appear to be essential intermediates in TSH action on adenylate
cyclase. The pos sibility that prostaglandins are part of a
negative feedback system con trolling TSH action is, as yet, a
tentative hypothesis, and further work will be required to unravel
the interrelationships between these sub stances that now appear to
be far more complex than has been envisaged thus far."
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