Hypothalamic Site‐Dependent Effects of Neuropeptide Y on Gonadotropin‐Releasing Hormone Secretion in Rhesus Macaques

K. ‐Y Francis Pau, Matthew Berria, David L. Hess, Harold G. Spies

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    49 Scopus citations

    Abstract

    In rodents and rabbits, neuropeptide Y (NPY) has a bimodal effect on gonadotropin‐releasing hormone (GnRH) secretion. lntracerebroventricular (icv) administration or direct infusion of NPY into the median eminence (ime) suppresses GnRH release in ovariectomized (OVX) animals, but stimulates GnRH release in intact or OVX animals treated with ovarian steroids. Specific ovarian steroiddependent NPY effects are, however, not obvious in non‐human primates. In OVX rhesus monkeys, icv administration of NPY has been shown to suppress luteinizing hormone (LH) secretion whereas ime infusion of NPY stimulates GnRH pulses. In such animals, estrogen replacement does not reverse the inhibitory NPY effect on LH release, although estrogen enhances the stimulatory NPY effect on GnRH secretion. These observations led us to speculate that the bimodal NPY effects in non‐human primates may depend on either the site of NPY action or the nature of the steroid milieu. This study utilized the push‐pull perfusion (PPP) technique to examine the effects of either ime or icv infusion of NPY on GnRH release in OVX monkeys treated with or without both ovarian steroids. Without exception, irne infusion of NPY increased GnRH concentrations in push‐pull perfusates regardless of the steroid status of the animals. In contrast, GnRH levels were reduced during icv infusion of NPY in both untreated and estrogen/progesterone‐treated, OVX monkeys. These results indicate that, unlike other mammalian species, in the rhesus monkey the stimulatory and inhibitory effects of NPY on GnRH release depend on the site of NPY infusion within the brain rather than the ovarian steroidal environment.

    Original languageEnglish (US)
    Pages (from-to)63-67
    Number of pages5
    JournalJournal of Neuroendocrinology
    Volume7
    Issue number1
    DOIs
    StatePublished - Jan 1995

    Keywords

    • GnRH
    • LH
    • NPY
    • hypothalamus
    • monkey
    • steroids

    ASJC Scopus subject areas

    • Endocrinology, Diabetes and Metabolism
    • Endocrinology
    • Endocrine and Autonomic Systems
    • Cellular and Molecular Neuroscience

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