By Ricardo Azziz
The sector of androgen extra problems has complex considerably because the unique e-book of this publication. The Androgen extra Society (AES) was once based to compile investigators within the box. a greater realizing of the screening, development, and molecular genetics of nonclassic adrenal hyperplasia (NCAH) has more suitable the scientific care and diagnostic accuracy of those sufferers. New standards for the prognosis of the polycystic ovary syndrome (PCOS) have been proposed in Rotterdam, standards that experience led to controversy and, expectantly, initiation of latest experiences. The organization of insulin resistance with PCOS has been bolstered, and the function of metformin in tre- ing the infertility of the PCOS has been demonstrated. hazards for diabetes and, extra cont- versially, heart problems in ladies with PCOS have obtained tremendous research. Our figuring out of the epidemiology and monetary effect of those problems has improved, emphasizing their serious significance. those are yet a couple of highlights of ways the terrain has replaced in a comparatively short time period. based on those advances, the name of this publication has been revised to mirror the turning out to be significance of PCOS because the such a lot general androgen extra disease in ladies, and arguably, because the person who may need the main critical antagonistic results for normal future health. There are fewer chapters to supply a extra concentrated elucidation of the realm. a number of chapters have been penned via new (and younger) authors who're undertaking state-of-the-art study within the box.
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Additional info for Androgen Excess Disorders in Women (Contemporary Endocrinology)
As a result, there can be one, two, three, or four copies of the P450c21 gene, but only one is functional, and its mutations arise from recombination with the nearby inactive pseudogene (41). Extra-adrenal 21α-hydroxylase activity, observed in a variety of fetal and adult tissues remains poorly characterized, but is not mediated by the same P450c21 enzyme that is found in the adrenal glands (42). 2. P450C11β AND P450C11AS The final steps in the mineralocorticoid and glucocorticoid pathways are catalyzed by P450c11β and P450c11AS (43,44) (Fig.
Whereas the other 17β-HSDs are members of the short-chain dehydrogenase family, 17β-HSD-V is a member of the aldoketoreductase family. The peripheral conversion of ∆4 androstenedione to testosterone by 17β-HSD-V in target tissues is apparently responsible for the “weak androgen” action of androstenedione. It is also the only form of 17β-HSD expressed in the ovarian theca and corpus luteum, suggesting that 17β-HSD-V is the enzyme responsible for the last step in testosterone production in the ovary.
2. Circulating Sex Steroids Dehydroepiandrosterone sulfate (DHEAS) is the most abundant steroid in the circulation of adults of reproductive age (62). DHEA, DHEAS, and androstenedione are produced almost exclusively by the adrenal zona reticularis. The adrenal does not express 17β-HSD-III; the minimal adrenal production of testosterone is probably a result of 17β-HSD-V (57). Adrenal C-19 steroids do not bind significantly to the androgen receptor; hence these steroids are primarily precursors that are converted to active androgens or estrogens by isozymes of 17β-HSD in target tissues.
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