Hypothalamic control of reproductive hormones

The hypothalamus governs reproduction by releasing gonadotropin-releasing hormone (GnRH) in precise pulses, which in turn drive the pituitary to produce the sex hormones that control puberty, fertility, and lifelong sexual development. A key discovery in recent decades is that a signaling system built around kisspeptin and its receptor GPR54, alongside the neuropeptide neurokinin B, acts as a master regulator upstream of GnRH—mutations in these genes cause forms of hypogonadism in which puberty fails to start or reproductive function is lost. Researchers are now working out how this neuroendocrine circuit integrates metabolic signals, stress, and circadian timing to calibrate reproduction to an organism's overall condition. Open questions include exactly how the brain sets the timing of puberty onset and how disruptions in this axis contribute to conditions such as polycystic ovary syndrome, premature puberty, and infertility.

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Keywords

PubertyGPR54 GeneKisspeptinHypogonadismGonadotropin-Releasing HormoneNeurokinin B