By Gerald Litwack
Biochemical activities of Hormones V4
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"I should still enterprise to claim that the main pervasive fallacy of philosophic pondering is going again to forget of context. III John Dewey " . . . philosophers don't develop like mushrooms, out of the earth; they're the outgrowth in their interval, their state, whose so much refined, gentle and invisible juices abound within the philosophical rules.
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6. Certain dynamic features of the hormone action may eventu- I. Affinity Labeling in Hormone Mechanisms 5 ally also be studied by the affinity, particularly the photoaffinity, labeling technique. Details of hormone transport in serum and across cell membranes might be investigated, as well as the binding dynamics of the intracellular hormone receptor complexes. 7. The ternary interaction of hormone-receptor complex with chromatin, which appears to be crucial to the mechanism of action of the lipophilic hormones, could be approached by the affinity labeling technique.
A5-3-Ketoisomerases from animal tissue sources have proven much more difficult to study, as they are largely particulate (Talalay and Benson, 1972). Recendy, Batzold and Robinson (1976) have reported that compound 3a and the related 19-norporgesterone secosteroid derivative cause a reduction in weight of adult male rat prostatic tissue. This appears to result from an inhibition of androgen biosynthesis, rather than from an effect on the prostate itself. 2. 62). , 1973a). At higher pH, however, the iodoestrone rapidly inactivates the dehydrogenase.
In general, each particular labeling problem will demand an empirical evaluation of these factors to achieve an acceptable compromise between the degree of selectivity and the extent of labeling. III. STEROID BINDING SITES Several distinct classes of proteins that bind hormonal steroids are involved in the total picture of steroid hormone action: (A) enzymes involved in steroid biosynthesis and metabolism, (B) enzymes affected allosterically by steroids, (C) steroid-binding serum proteins, and (D) target tissue-specific steroid binding proteins (steroid receptors).
Biochemical Actions of Hormones. Volume 4 by Gerald Litwack