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Related Experiment Videos

Hypothalamic-pituitary axis during reproductive aging in mice.

S Belisle1, D Bellabarba, J G Lehoux

  • 1Department of Obstetrics-Gynecology, Faculty of Medicine, University of Sherbrooke, Quebec, Canada.

Mechanisms of Ageing and Development
|March 15, 1990
PubMed
Summary

Aging impacts reproductive hormones in female mice. While hypothalamic GnRH increases with age, pituitary gonadotropin production shows age-related defects, suggesting issues beyond hormone signaling.

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Area of Science:

  • Reproductive Endocrinology
  • Neuroendocrinology
  • Aging Research

Background:

  • The hypothalamic-pituitary-gonadal axis regulates reproductive functions.
  • Aging is associated with significant hormonal changes affecting fertility.
  • Understanding age-related alterations in gonadotropin regulation is crucial.

Purpose of the Study:

  • To investigate age-related changes in hypothalamic GnRH and pituitary GnRH receptor expression.
  • To correlate these changes with pituitary and plasma gonadotropin (FSH and LH) levels in aging female mice.
  • To examine the effects of ovariectomy and estrogen therapy on these parameters across different age groups.

Main Methods:

  • Studied intact and ovariectomized C57BL/6J female mice at young, middle-age, and old stages.

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  • Measured hypothalamic GnRH content and pituitary GnRH receptor binding.
  • Assessed pituitary and plasma levels of Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH).

    • Main Results:

    • Intact aging mice showed increased hypothalamic GnRH but unchanged pituitary GnRH receptors, with rising FSH and LH.
    • Ovariectomy decreased hypothalamic GnRH and pituitary receptors, with gonadotropin levels rising, but blunted in old mice.
    • Estrogen therapy normalized hypothalamic GnRH and pituitary receptors, but only partially restored plasma FSH/LH to intact levels in older mice.

    Conclusions:

    • Aging exhibits a dichotomy in pituitary FSH/LH production, independent of hypothalamic GnRH or its pituitary receptor levels.
    • Suggests age-related cellular defects in post-receptor signaling pathways within the pituitary gland.
    • Highlights complex regulatory mechanisms of gonadotropin secretion during female aging.