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. 2010 Jan;24(1):261–274. doi: 10.1210/me.2009-0473

Fig. 13.

Fig. 13.

NKB and GnIH: novel regulators of gonadotropin in man. Schematic describing the potential mechanisms for control of gonadotropin secretion by NKB and GnIH. Kisspeptin (Kiss) released from kisspeptin neurons within the hypothalamus is known to control secretion of GnRH from GnRH neurons through interaction with its cognate receptor (KissR/GPR54). Secretion of GnRH from these neurons then leads to secretion of gonadotropins (LH/FSH) from pituitary gonadotropes. NKB is colocalized in kisspeptin neurons and is postulated to be a novel regulator of GnRH secretion either through direct interaction with GnRH neurons or through autocrine interactions with kisspeptin neurons. GnIH is a potent inhibitor of GnRH stimulation of gonadotropin secretion from cultured gonadotropes but may also operate by inhibiting the activity of GnRH neurons.