期刊
JOURNAL OF NEUROENDOCRINOLOGY
卷 19, 期 5, 页码 354-363出版社
WILEY
DOI: 10.1111/j.1365-2826.2007.01535.x
关键词
gonadotrophin-releasing hormone (GnRH); median eminence; marmoset chorionic gonadotrophin (CG); marmoset monkey
资金
- NCRR NIH HHS [RR020141, P51 RR000167, RR000167, RR15459] Funding Source: Medline
- NICHD NIH HHS [HD007678] Funding Source: Medline
- NIMH NIH HHS [MH011417] Funding Source: Medline
Unlike other mammals, including rodents, Old World primates and humans, common marmosets and probably all other New World primates synthesise and release chorionic gonadotrophin (CG), and not luteinising hormone (LH) from pituitary gonadotrophs. However, little is known about the physiological dynamics of gonadotrophin-releasing hormone (GnRH)-regulated CG release from gonadotrophs and whether such CG release has pulsatile release characteristics similar to those of LH in other mammalian species. Consequently, we performed a series of in vivo and in vitro studies in ovariectomised laboratory rats and female marmosets to compare GnRH-induced pituitary LH and CG release characteristics, respectively. Exogenous GnRH stimulated a slower onset of release of marmoset pituitary CG, both in vivo and in vitro, and induced an approximately 400% greater increase in the duration of marmoset pituitary CG release compared to that for rat LH. Not surprisingly, hypothalamic pulsatile release of GnRH in vivo was not obviously concordant with endogenous episodic changes in circulating levels of CG in marmosets, in contrast to the clear concordance observed between in vivo GnRH and LH release previously demonstrated in rats and other mammals. Pituitary CG release in marmosets thus demonstrates considerable divergence from the timely hypothalamic GnRH-regulated LH release in other female mammals, implying potentially different physiological dynamics in gonadotrophin regulation of marmoset ovarian function.
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