GHRH GHRP refers to the combined action and therapeutic strategy utilizing Growth Hormone-Releasing Hormone (GHRH) and Growth Hormone-Releasing Peptides (GHRPs). GHRH is a hypothalamic peptide that stimulates the pituitary to release growth hormone (GH) in a pulsatile manner. GHRPs, conversely, are synthetic secretagogues that act via the ghrelin receptor to amplify the pituitary’s GH release, independent of the GHRH receptor. The strategic co-administration of these two classes of agents leverages their synergistic effects to maximize the natural, pulsatile secretion of endogenous GH.
Origin
The terms GHRH and GHRP originate from neuroendocrinology research focused on the regulation of the somatotropic axis. GHRH was identified in the 1980s as the primary physiological stimulator of GH release. GHRPs were later discovered as a distinct class of agents mimicking the action of ghrelin, the “hunger hormone,” on GH secretion. Their combined use in clinical practice reflects a sophisticated understanding of the physiological control mechanisms of growth hormone release.
Mechanism
The mechanism relies on the distinct yet complementary receptor targets within the anterior pituitary gland. GHRH binds to its specific receptor, increasing the synthesis and release of GH from somatotroph cells. GHRPs bind to the ghrelin receptor (GHSR), promoting GH release and simultaneously enhancing the sensitivity of the somatotrophs to GHRH. The co-stimulation provides a powerful, physiological pulse of GH, which then mediates its anabolic and lipolytic effects primarily through the induction of Insulin-like Growth Factor-1 (IGF-1) in the liver and peripheral tissues.
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