Sermorelin is a synthetic peptide that functions as an analog of Growth Hormone-Releasing Hormone (GHRH), a naturally occurring hypothalamic peptide. Clinically, it is used to stimulate the pituitary gland to release its own stored, endogenous Growth Hormone (GH) in a pulsatile, physiological manner. This indirect mechanism of action is preferred by some clinicians as it supports the body’s natural regulatory feedback loops, offering a potentially gentler alternative to direct GH administration for certain indications.
Origin
Sermorelin was developed through biochemical research aimed at identifying and synthesizing the active fragment of the naturally occurring human GHRH molecule. The original discovery of GHRH in the hypothalamus was a significant milestone in neuroendocrinology. Sermorelin represents the first 29 amino acids of the GHRH sequence, which were found to be sufficient for full biological activity on the pituitary somatotroph cells.
Mechanism
As a GHRH analog, Sermorelin binds to the GHRH receptors on the somatotroph cells of the anterior pituitary gland. This binding initiates an intracellular signaling cascade, primarily involving cyclic AMP, which stimulates the synthesis and secretion of Growth Hormone into the bloodstream. By acting upstream, Sermorelin promotes the pulsatile, physiological release of GH, maintaining the integrity of the negative feedback loop involving IGF-1 and somatostatin, which helps regulate the overall somatotropic axis.
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