Gonadotropin-releasing hormone

luteinizing hormone (LH)

Justification not yet generated — showing supporting facts

• Gonadotropin-releasing hormone (GnRH), produced by the hypothalamus, regulates the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior pituitary gland.
• The onset of male puberty is stimulated by a rise in gonadotropin-releasing hormone (GnRH) from the hypothalamus, which triggers the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior pituitary.
• Congenital isolated GnRH, LH, or FSH deficiency can cause secondary hypogonadism, including conditions such as Kallmann’s syndrome, Prader-Willi syndrome, Lawrence-Moon syndrome, GnRH receptor mutations, beta-subunit mutations in LH or FSH, or kisspeptin/G protein-coupled receptor fifty-four mutations.
• Secondary hypogonadism in human males results from a disruption in the hypothalamic-pituitary axis where low gonadotropin-releasing hormone (GnRH), luteinizing hormone (LH), or follicle-stimulating hormone (FSH) leads to low testosterone and impaired spermatogenesis.
• The menstrual cycle is regulated by the hormones GnRH, FSH, LH, estradiol, and progesterone.
• After the onset of puberty, the hypothalamus releases GnRH in a pulsatile fashion every one to two hours to maintain levels of FSH, LH, and plasma testosterone.
• GnRH stimulates the anterior pituitary by binding to and activating a G protein receptor on gonadotrophs, which triggers inositol 1,4,5-triphosphate (IP3) activation and increases intracellular calcium, leading to the release of FSH (follicle-stimulating hormone) and LH (luteinizing hormone).
• Luteinizing hormone (LH) secretion is the result of gonadotropin-releasing hormone (GnRH) pulsatility, which is regulated by hypothalamic clock genes and the pulsatile secretion of Kisspeptin.
• In cases of secondary hypogonadism, Leydig and Sertoli cells remain functional and intact but cannot exert their effects due to a lack of proper stimuli (GnRH, LH, or FSH), resulting in low testosterone levels or loss of spermatogenesis.
• Luteinizing hormone (LH) seasonality appears to be independent of the environment and may be regulated by a central mechanism involving the hypothalamic gonadotropin-releasing hormone (GnRH).
• The hypothalamic-pituitary-gonadal axis, formed by GnRH, FSH, LH, and testicular hormones, promotes and maintains sexual development and function in the male.
• In females, estrogens and progesterone are released from the developing follicles, distinct from the hormones GnRH, FSH, and LH.
• Gonadotropin-releasing hormone (GnRH) travels to the anterior pituitary gland, where it activates G protein–coupled receptors, signaling the pituitary gland to release follicle-stimulating hormone (FSH) and luteinizing hormone (LH).

progesterone

Progesterone and Gonadotropin-releasing hormone (GnRH) are both key regulatory hormones in the menstrual cycle [1]. Specifically, a decline in progesterone levels triggers an increase in GnRH pulsatile secretion, which subsequently influences FSH levels during the late luteal phase [2], [3]. — 4 supporting facts

testosterone

Testosterone inhibits the secretion of GnRH [1], creating a direct negative feedback relationship. Additionally, low GnRH levels in secondary hypogonadism lead to reduced testosterone production [2] and [3], highlighting their interconnected roles in the hypothalamic-pituitary-gonadal axis. — 3 supporting facts