Conversion of Testosterone to E2

Aromatization of testosterone is catalyzed by the microsomal enzyme, cytochrome P450 aromatase (P450arom). Once substrate binding occurs, there is a sequential hydroxylation, oxidation, and removal of the C19 carbon, followed by aromatization of the A ring of the steroid. The entire aromatase reaction uses three molecules of oxygen and three electrons donated by NADPH (62-64). In the testis, aromatase activity is detectable in Leydig cells, Sertoli cells, and germ cells (65-69). The relative contributions of each of these testicular cell types to testicular aromatase activity varies with age and between species (70). In the rat and mouse, germ cells are a significant site of activity during adulthood (68). Sertoli cells contribute to testicular aromatase activity only in immature animals (71). However, in humans, Leydig cells are the only source of testicular estrogens at all ages (39). Sertoli cell cultures from juvenile monkeys expressed follicle-stimulating hormone (FSH) driven aromatase (72).

Invisible Viagara

Invisible Viagara

You are about to discover the "little-known" techniques, tricks and "mind tools" that will show you how to easily "program" your body and mind to produce an instant, rock-hard erection. Learn how to enjoy all of the control, confidence and satisfaction that comes from knowing you can always "rise to the challenge" ... and never have to deal with embarrassment, apologies, shyness or performance anxiety in the bedroom, ever again.

Get My Free Ebook

Post a comment