— peptide / growth —
First-generation hexapeptide ghrelin receptor agonist that helped establish the synthetic secretagogue receptor pharmacology field.
Bowers et al. 1980s-90s. Appetite signaling research literature. Read more →
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Research-grade material. Documentation summarizes published literature in third-person scientific context. Not medical advice; not for human consumption.
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— The literature —
GHRP-6 binds the growth hormone secretagogue receptor type 1a (GHSR-1a) on pituitary somatotrophs and on hypothalamic arcuate nucleus neurons, including NPY/AgRP-expressing cells implicated in appetite regulation. Receptor activation couples through Gq to phospholipase C, mobilizing intracellular calcium and stimulating growth hormone exocytosis from somatotrophs while activating central feeding circuits in the hypothalamus.
The hexapeptide produces a characteristic profile of growth hormone release, modest cortisol and prolactin elevation, and pronounced acute appetite stimulation. The appetite-stimulating activity reflects engagement of central GHSR-1a expressed on NPY/AgRP neurons, with downstream activation of orexigenic neuropeptide systems. Combination of GHRP-6 with GHRH analogs produces synergistic growth hormone release reflecting the dual-receptor regulation of somatotrophs, with Gs-mediated cAMP signaling (from GHRH receptor) and Gq-mediated calcium signaling (from GHSR-1a) acting in complementary fashion.
All compounds discussed are intended for research use only. Not for human consumption. Research-context information is educational and does not constitute medical advice.
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