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Review
. 2019 Dec;45(12):2318-2329.
doi: 10.1111/jog.14124. Epub 2019 Oct 13.

Role of kisspeptin neurons as a GnRH surge generator: Comparative aspects in rodents and non-rodent mammals

Fuko Matsuda  1 , Satoshi Ohkura  2 , Fumie Magata  1 , Arisa Munetomo  1 , Jing Chen  1 , Marimo Sato  1 , Naoko Inoue  3 , Yoshihisa Uenoyama  3 , Hiroko Tsukamura  3
Affiliations
Review

Role of kisspeptin neurons as a GnRH surge generator: Comparative aspects in rodents and non-rodent mammals

Fuko Matsuda et al. J Obstet Gynaecol Res. 2019 Dec.

Abstract

Ovulation is an essential phenomenon for reproduction in mammalian females along with follicular growth. It is well established that gonadal function is controlled by the neuroendocrine system called the hypothalamus-pituitary-gonadal (HPG) axis. Gonadotropin-releasing hormone (GnRH) neurons, localized in the hypothalamus, had been considered to be the head in governing the HPG axis for a long time until the discovery of kisspeptin. In females, induction of ovulation and folliculogenesis has been linked to a surge mode and pulse mode of GnRH releases, respectively. The mechanisms of how the two modes of GnRH are differently regulated had long remained elusive. The discovery of kisspeptin neurons, distributed in two hypothalamic nuclei, such as the arcuate nucleus in the caudal hypothalamus and preoptic area or the anteroventral periventricular nucleus in the rostral hypothalamic regions, and analyses of the detailed functions of kisspeptin neurons have led marked progress on the understanding of different mechanisms regulating GnRH surges (ovulation) and GnRH pulses (folliculogenesis). The present review will focus on the role of kisspeptin neurons as the GnRH surge generator, including the sexual differentiation of the surge generation system and factors that regulate the surge generator. Comparative aspects between mammalian species are especially focused on.

Keywords: KISS1; GPR54; gonadotropin; luteinizing hormone surge; sexual differentiation.

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