Abstract
The male gonadotropic axis consists of the hypothalamus, pituitary gland and testes. Testosterone is produced by the Leydig cells in the presence of pituitary luteinizing hormone (LH). LH and FSH (follicle stimulating hormone) are themselves regulated by gonadotropin-releasing hormone or GnRH, released in pulses by the anterior hypothalamic neurons. The embryonic migration of GnRH neurons, which is a critical step in this process, is now better understood thanks to the identification of new genes that are involved. The regulation of the gonadotropic function has itself been illuminated by the identification of new peptide regulatory factors which include kisspeptins. This review traces the physiology of male gonadotrope axis based on new knowledge relating to its establishment, its operation and its regulation, allowing a better understanding of the congenital hypogonadotropic hypogonadism.
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