Gonadotropin-releasing hormone receptor type 1 (GnRHR)

The gonadotropin-releasing hormone receptor type 1 (GnRHR, also known as LHRHR or GnRH1R) is a class A, seven-transmembrane G protein-coupled receptor predominantly expressed on pituitary gonadotrope cells, where it mediates the action of hypothalamic GnRH to stimulate the synthesis and secretion of the gonadotropins luteinizing hormone (LH) and follicle-stimulating hormone (FSH)[1][3][4][7][8][9]. Uniquely, mammalian type I GnRHR lacks a cytoplasmic C-terminal tail, resulting in resistance to rapid desensitization and a distinct pattern of receptor internalization[1][4][5]. GnRHR is activated by GnRH agonists and blocked by antagonists, with profound therapeutic implications in reproductive medicine and hormone-responsive cancers. Beyond its principal role in reproductive control, GnRHR is also found in tissues such as lymphocytes and some hormone-dependent tumors, and is implicated in the pathology and clinical management of infertility, hormone-dependent cancers, and other sex hormone-driven conditions[3][7].

Other names

Luteinizing hormone releasing hormone receptor (LHRHR)GnRH receptorType I GnRH receptorGNRHRGnRH1RLH-RH receptorGonadorelin receptor

Agonists initially stimulate and then desensitize/downregulate pituitary GnRH receptors, leading to decreased LH/FSH (downregulation: medical castration/pseudomenopause) Antagonists competitively block GnRH receptor, rapidly suppressing LH/FSH release