Adenosine was identified as a partial agonist of the GH secretagogue receptor from hypothalamic extracts, suggesting it contributes to natural GH regulation alongside ghrelin.
Energy meets GHAdenosine — a marker of cellular energy use — partially activates the same receptor as ghrelin, potentially linking energy metabolism to GH regulation
What the researchers found
Adenosine was identified as a partial agonist of the GH secretagogue receptor (GHS-R) from hypothalamic extract fractionation, producing submaximal receptor activation compared to full agonists like ghrelin.
Why it matters
Adenosine is everywhere in the body and influences sleep, inflammation, and energy metabolism. Its interaction with the GH secretagogue receptor creates a new link between cellular energy status and growth hormone regulation.
How the study worked
In-vitro study fractionating porcine hypothalamic extracts and testing fractions on HEK293 cells expressing GHS-R. Adenosine identified by chromatography and confirmed with receptor binding and functional assays.
What this study cannot tell us
In-vitro finding. Whether adenosine activates GHS-R at physiological concentrations in the brain is uncertain. Partial agonism may not produce significant GH release in vivo.
How to read the evidence
Preliminary in-vitro evidence from an unbiased receptor ligand search, providing a novel finding that requires in-vivo validation.
When this study was published
Published in 2000. The adenosine-GHS-R interaction has been further investigated, with implications for understanding sleep-GH connections.
The bigger picture
The GH secretagogue receptor may integrate multiple signals — ghrelin for nutritional status and adenosine for cellular energy status — providing the brain with a comprehensive metabolic picture for GH regulation.
Questions still open
- Does adenosine contribute to GH regulation in vivo?
- Could caffeine (an adenosine antagonist) affect GH secretion through GHS-R?
- How does adenosine's partial agonism interact with ghrelin's full agonism?
Common questions
Why would an energy molecule affect growth hormone?
Does caffeine affect growth hormone?
Read the original research
Adenosine: A partial agonist of the growth hormone secretagogue receptor.
Biochemical and biophysical research communications, 276(3), 1306-13
Citation
Smith, R G; Griffin, P R; Xu, Y; Smith, A G; Liu, K; Calacay, J; Feighner, S D; Pong, C; Leong, D; Pomés, A; Cheng, K; Van der Ploeg, L H; Howard, A D; Schaeffer, J; Leonard, R J. (2000). Adenosine: A partial agonist of the growth hormone secretagogue receptor.. Biochemical and biophysical research communications, 276(3), 1306-13.