E strogens are the principal sex hormones responsible for female reproductive maturation and sexual characteristics. However, androgens are also important for female sexual health and well-being. 1 The physiologic effects of androgens are in part due to their role as precursors for estrogen synthesis, but these hormones also have independent effects on female reproductive tissues, mood, cognition, breasts, bones, muscles, vasculature, and other systems. 1
See related editorial, page 44Here we will discuss the physiologic roles of androgens as well as the indications and best-practice recommendations for androgen therapy in women.
■ ANDROGEN SYNTHESIS, PRODUCTION, AND MEASUREMENT IN WOMENThe biologically active androgens in women are dehydroepiandrosterone sulfate (DHEA-S), dehydroepiandrosterone (DHEA), androstenedione, testosterone, and dihydrotestosterone. In women, roughly 25% of androgen production occurs in the adrenal glands, 25% occurs in the ovaries, and the rest occurs peripherally. 2 DHEA-S, DHEA, and androstenedione are the main prohormones that are peripherally converted to the active androgens testosterone and dihydrotestosterone. DHEA-S is almost exclusively produced in the adrenal glands, whereas DHEA, androstenedione, and testosterone are produced in the adrenal glands and ovaries and by peripheral conversion. In target tissues, circulating testosterone is converted to dihydrotestosterone by 5-alpha-reductase and aromatized to estradiol .