Hypothalamic control of reproductive hormones

The hypothalamus governs reproduction by releasing gonadotropin-releasing hormone (GnRH) in carefully timed pulses, which in turn drive the pituitary gland to produce the hormones that control the gonads — a cascade that must be precisely calibrated from puberty onward for normal sexual development and fertility. Much of the recent work in this area has focused on kisspeptin, a neuropeptide encoded by the KISS1 gene that acts on the GPR54 receptor to act as a master switch for GnRH secretion, with loss-of-function mutations in either gene producing hypogonadism and absent puberty in both mice and humans. Neurokinin B has emerged as a closely linked regulator of kisspeptin neuron activity, and together these signaling pathways are now central targets for understanding why puberty timing varies so widely across individuals and populations. Open questions include how environmental and metabolic signals — from body fat to stress — are integrated by hypothalamic circuits to permit or suppress reproductive function, and whether targeted manipulation of the kisspeptin–GPR54 axis can offer new treatments for infertility and hormone deficiency disorders.

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Keywords

PubertyGPR54 GeneKisspeptinHypogonadismGonadotropin-Releasing HormoneNeurokinin B