Gonadotropin-releasing hormone receptor (GnRHR) (GnRHR)

The Gonadotropin-releasing hormone receptor (GnRHR) is a G protein-coupled receptor primarily located on the surface of gonadotroph cells in the anterior pituitary gland [1, 5]. It plays a central role in the hypothalamic-pituitary-gonadal (HPG) axis by binding to its ligand, GnRH, which is released pulsatilly from the hypothalamus [6, 13]. Activation of the GnRHR stimulates the synthesis and release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which in turn regulate gonadal steroidogenesis and gametogenesis [2, 11]. Dysregulation of this system is implicated in various hormone-dependent conditions, including prostate and breast cancers, endometriosis, and precocious puberty [1, 4, 7]. Pharmacological modulation of the GnRHR involves the use of both agonists, which cause initial stimulation followed by profound receptor desensitization and down-regulation, and antagonists, which provide immediate suppression of the axis [4, 7]. These therapies are widely utilized in oncology, gynecology, and reproductive medicine to control sex hormone levels and manage reproductive disorders [3, 7].

Other names

GnRH receptorLuteinizing hormone-releasing hormone receptorLHRH receptorGNRHR1Gonadotropin-releasing hormone receptor type 1

Drugs targeting this receptor act as either agonists, which cause initial hormone stimulation followed by receptor desensitization and downregulation of the pituitary-gonadal axis, or antagonists, which directly compete with endogenous GnRH to rapidly suppress gonadotropin release.