GHRP-6 Peptide

Research leading to GHRP-6 began with investigations by Cyril Bowers and colleagues into small synthetic peptides capable of selectively activating endocrine signaling.

In 1984, Bowers and colleagues reported a synthetic hexapeptide, His-D-Trp-Ala-Trp-D-Phe-Lys-NH₂, capable of producing a strong and selective response in experimental growth-hormone models. This peptide became known as GHRP-6 and helped establish the growth hormone secretagogue class.

Subsequent work ultimately contributed to identification and characterization of the GHS-R pathway and its endogenous ligand, ghrelin.

CAS #: 87616-84-0
Molecular Formula: C₄₆H₅₆N₁₂O₆
Molecular Weight: 873.0 g/mol
PubChem ID: 9919153

GHRP-6 has been studied extensively in endocrine and receptor-signaling models. Experimental findings have examined its interaction with GHS-R, endogenous GHRH signaling, pituitary response, and broader hypothalamic-pituitary communication.

Key Areas of Research:

• Receptor: GHS-R binding and activation
• Endocrine: Secretagogue signaling and pathway response
• Pituitary: Somatotroph activity and signaling dynamics
• Hypothalamic: Interaction with endogenous GHRH pathways

Together, this body of research has made GHRP-6 an important reference peptide for studying growth hormone secretagogue biology. Experiments have also demonstrated that endogenous GHRH signaling contributes substantially to the response produced by GHRP-6, illustrating the interaction between multiple endocrine regulatory pathways.

Bowers C.Y., Momany F.A., Reynolds G.A., Hong A. (1984). On the in vitro and in vivo activity of a new synthetic hexapeptide that acts on the pituitary to specifically release growth hormone. Endocrinology, 114(5):1537–1545.

Bowers C.Y. et al. (1990). Journal of Clinical Endocrinology & Metabolism, 70(4):975–982. PubMed ID 2108187.

Bowers C.Y. (1998). Growth hormone-releasing peptide (GHRP). Cellular and Molecular Life Sciences, 54(12):1316–1329.