A new G-protein-linked receptor for GH secretagogues (including MK-677, GHRP-6, and hexarelin) was identified and characterized, distinct from the GHRH receptor.
New receptor identifiedA specific high-affinity receptor for all GH secretagogues was identified, distinct from the GHRH receptor
What the researchers found
A specific high-affinity G-protein-linked receptor for GH secretagogues was identified, operating through a distinct signaling pathway from GHRH.
Why it matters
Identifying this receptor was a landmark discovery that explained how GH secretagogues work and led directly to the discovery of ghrelin — the body's natural hunger hormone.
How the study worked
Molecular biology approach using receptor binding assays, G-protein coupling analysis, and signaling pathway characterization to identify and characterize the GHS receptor.
What this study cannot tell us
Initial characterization study. The receptor's natural ligand was not yet identified. Full tissue distribution and physiological role remained to be determined.
How to read the evidence
Strong molecular biology evidence identifying a novel receptor. A landmark finding confirmed by subsequent research and the discovery of ghrelin.
When this study was published
Published in 1996, this is a landmark receptor discovery paper. The receptor (GHS-R1a) and its natural ligand ghrelin were fully characterized by 1999.
The bigger picture
This receptor identification was one of the most significant discoveries in endocrinology of the 1990s. It led to the discovery of ghrelin (1999), connecting growth hormone regulation to appetite, metabolism, and energy homeostasis.
Questions still open
- What is the endogenous ligand for this receptor?
- What is the full tissue distribution and physiological role of this receptor?
Common questions
What was discovered about this receptor?
Why is this receptor discovery important for GH peptide users?
Read the original research
Identification of a new G-protein-linked receptor for growth hormone secretagogues.
Molecular endocrinology (Baltimore, Md.), 10(1), 57-61
Citation
Pong, S S; Chaung, L Y; Dean, D C; Nargund, R P; Patchett, A A; Smith, R G. (1996). Identification of a new G-protein-linked receptor for growth hormone secretagogues.. Molecular endocrinology (Baltimore, Md.), 10(1), 57-61.