Luteinizing hormone is a glycoprotein hormone involved in reproductive signaling, gonadal steroid production, ovulation regulation, and coordination of endocrine reproductive physiology. LH functions as a primary pituitary regulator of ovarian and testicular activity and plays a central role in reproductive endocrine communication.
In females, the hormone stimulates ovulation, supports corpus luteum formation, and promotes ovarian steroid hormone synthesis. In males, LH stimulates Leydig cells within the testes to produce testosterone. The hormone also contributes to gamete maturation, reproductive tissue maintenance, and regulation of fertility-related endocrine pathways. Through these actions, LH coordinates communication between the pituitary gland, gonads, and hypothalamic reproductive signaling systems.
LH is produced by gonadotroph cells within the anterior pituitary gland. The hormone consists of alpha and beta glycoprotein subunits synthesized and assembled within pituitary secretory pathways before regulated release into circulation.
Production occurs in pulsatile patterns controlled primarily by hypothalamic gonadotropin-releasing hormone signaling. In females, secretion fluctuates throughout the menstrual cycle, including the characteristic LH surge associated with ovulation. In males, secretion occurs in more stable pulsatile rhythms supporting ongoing testosterone production.
LH secretion is regulated mainly through hypothalamic GnRH signaling and negative feedback from gonadal steroid hormones including testosterone, estradiol, and progesterone. In females, positive feedback from elevated estradiol can trigger the ovulatory LH surge.
The hormone acts through luteinizing hormone receptor systems linked to cyclic AMP signaling, steroidogenic enzyme activation, and reproductive tissue signaling pathways. Nutritional state, stress physiology, circadian signaling, and reproductive endocrine status can all influence secretion dynamics. Through these integrated reproductive endocrine systems, LH coordinates ovulation, gonadal steroidogenesis, fertility signaling, and reproductive physiological adaptation.
LH drives gonadal steroidogenesis and, in females, ovulation.
