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Related Experiment Videos

The aging ovary.

J L Shifren1, I Schiff

  • 1Department of Obstetrics, Gynecology, and Reproductive Biology, Harvard Medical School, Boston, Massachusetts, USA.

Journal of Women'S Health & Gender-Based Medicine
|March 1, 2000
PubMed
Summary
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Ovarian estrogen production significantly drops after menopause, with remaining estrogen derived from androgen conversion. Sex hormone-binding globulin (SHBG) levels are crucial for determining the biological activity of these sex steroids.

Area of Science:

  • Endocrinology
  • Reproductive Biology
  • Gerontology

Background:

  • Ovarian steroid biosynthesis is gonadotropin-dependent during reproductive years, occurring in theca and granulosa cells.
  • Menopausal ovaries undergo follicular atresia but retain androgen-producing theca-interstitial cells.
  • Aging reduces both ovarian and adrenal androgen biosynthesis, with a more pronounced decline in ovarian estrogen production.

Purpose of the Study:

  • To elucidate the changes in ovarian steroid biosynthesis with age and menopause.
  • To understand the sources of circulating estrogen after menopause.
  • To examine the role of sex hormone-binding globulin (SHBG) in regulating steroid hormone biological activity.

Main Methods:

  • The study is a review of existing literature on ovarian steroidogenesis and aging.

Related Experiment Videos

  • Analysis of hormonal changes in pre- and post-menopausal women.
  • Examination of the relationship between SHBG levels and bioavailable androgens and estrogens.

    • Main Results:

    • Post-menopause, ovarian estradiol biosynthesis is minimal; circulating estrogen primarily results from peripheral aromatization of androgens.
    • While ovarian androgen production decreases with age, it does not abruptly cease at menopause like estrogen.
    • Sex hormone-binding globulin (SHBG) levels significantly influence the unbound, biologically active fractions of testosterone and estradiol.

    Conclusions:

    • The aging ovary exhibits reduced estrogen production but continues to produce androgens, which become the primary source of circulating estrogen via peripheral conversion.
    • SHBG is a critical regulator of sex hormone bioavailability and action, irrespective of menopausal status.
    • Understanding these hormonal shifts is vital for addressing age-related endocrine changes and their health implications.