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Regulation versus modulation in GnRH receptor function.

J C Zolman, T J Theodoropoulos

    The American Journal of the Medical Sciences
    |March 1, 1985
    PubMed
    Summary
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    Endocrinology·1985

    Estradiol-17 beta (E2) enhances luteinizing hormone (LH) release by altering gonadotropin-releasing hormone (GnRH) receptor binding in the anterior pituitary. This interaction is crucial for E2

    Area of Science:

    • Endocrinology
    • Reproductive Biology
    • Molecular Pharmacology

    Background:

    • Luteinizing hormone (LH) release from the anterior pituitary is stimulated by gonadotropin-releasing hormone (GnRH).
    • Estradiol-17 beta (E2) is a key reproductive hormone, but its rapid effects on LH release are not fully understood.
    • Previous studies suggest E2 may influence GnRH action at the pituitary level.

    Purpose of the Study:

    • To investigate the effect of estradiol-17 beta (E2) on gonadotropin-releasing hormone (GnRH) binding to its receptor.
    • To elucidate the mechanism by which E2 modulates GnRH-induced LH release from the anterior pituitary.

    Main Methods:

    • Dispersed bovine anterior pituitary cells were preincubated with or without physiologic concentrations of E2.
    • Cells were subsequently incubated with radiolabeled GnRH (125I-GnRH) to assess binding.

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  • LH release rates were measured dynamically during superfusion in vitro.

    • Main Results:

    • Estradiol-17 beta (E2) pre-treatment significantly increased the number of high-affinity GnRH binding sites.
    • E2 altered the binding capacity and cooperativity of GnRH-receptor interactions.
    • E2 alone did not show an instantaneous effect on LH release rate, but its interaction with the GnRH receptor was mandatory for short-term pituitary effects.

    Conclusions:

    • The interaction of E2 with the GnRH receptor is essential for the rapid pituitary effects of E2 on LH release.
    • E2 modulates GnRH receptor dynamics, influencing the sensitivity of the anterior pituitary to GnRH.
    • This study highlights a direct molecular mechanism for E2's short-term regulation of the LH surge.