Gonadotropin-releasing hormone (GnRH) signaling (Bos taurus)

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Gonadotropin-releasing hormones (GnRH) are the key factors stimulating gonadotropin release from the pituitary. GnRHs are decapeptides that act via G-protein coupled receptors (gonadotropin-releasing hormone receptors, GnRH-R). To date, several molecular forms of GnRH and GnRH-R have been identified in vertebrates. In most species, two forms of GnRH are present. one that is hypophysiotropic, stimulating gonadotropin release from the pituitary, and one that plays a neuromodulatory role in the central nervous system. The pituitary gonadotropins are heterodimeric glycoprotein-hormones consisting of a non-covalently linked common glycoprotein-hormone ?-subunit and a specific ?-subunit (FSH? or LH?) conferring their biological activity(2)