Growth Hormone Secretagogues (GHSs) are a class of compounds that stimulate the pituitary gland to increase the pulsatile, endogenous secretion of Growth Hormone (GH). Unlike exogenous GH administration, GHSs work by interacting with specific receptors, such as the ghrelin receptor, to enhance the body’s natural production and release patterns. Clinically, they are utilized to support tissue repair, improve body composition, and enhance overall vitality in cases of age-related GH decline.
Origin
The scientific understanding of GHSs began with the isolation of ghrelin, the endogenous ligand for the GH secretagogue receptor (GHSR), in the late 20th century. This discovery led to the development of synthetic molecules capable of mimicking or amplifying ghrelin’s action on the pituitary somatotroph cells. The term is a cornerstone of contemporary endocrinology and longevity medicine, offering a nuanced approach to GH optimization.
Mechanism
GHSs primarily function by binding to the GHSR in the pituitary and hypothalamus, which in turn suppresses the release of somatostatin (GH-inhibiting hormone) and stimulates the release of Growth Hormone-Releasing Hormone (GHRH). This dual action amplifies the natural GH pulsatility, leading to an increased systemic concentration of GH and, subsequently, Insulin-like Growth Factor 1 (IGF-1) from the liver. The ultimate effect is the stimulation of anabolic processes, lipolysis, and cellular regeneration throughout the body.
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