Neuroendocrinology of opioid peptides and their role in the control of gonadotropin and prolactin secretion.

Abstract:

:Substantial evidence now exists to indicate that the endogenous hypothalamic opioidergic mechanism(s) represents one of the important controlling systems for release of gonadotropin-releasing hormone. Modulations of frequency and amplitude of the secretory activity of gonadotropin-releasing hormone appears to be mediated through an inhibitory action of endogenous opioids, and the functional coupling of the opioidergic and gonadotropin-releasing hormone systems is an ovarian steroid-dependent event. There is also evidence to implicate suprahypothalamic mechanism(s) that enhance endogenous opioid inhibition of secretion of gonadotropin-releasing hormone. Although exogenous opioid peptides and their synthetic analogs consistently induce the secretion of prolactin, blockade of opioid receptors in humans by naloxone failed to elicit a decrement in the levels of prolactin under a variety of conditions. On the contrary, naloxone induced a remarkable increment in the secretion of prolactin via an increased frequency of pulsatile release which is synchronized with pulses of luteinizing hormone. These observations suggest that a common neuroendocrine mechanism is involved in the opioidergic control of the secretion of both luteinizing hormone and prolactin in women.

journal_name

Am J Obstet Gynecol

authors

Yen SS,Quigley ME,Reid RL,Ropert JF,Cetel NS

doi

10.1016/s0002-9378(85)80162-9

subject

Has Abstract

pub_date

1985-06-15 00:00:00

pages

485-93

issue

4

eissn

0002-9378

issn

1097-6868

pii

S0002-9378(85)80162-9

journal_volume

152

pub_type

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