GH Secretagogues Directly Affect Skeletal Muscle Electrical and Contractile Properties
GH secretagogues directly modulated skeletal muscle electrical excitability and contractile force through a ghrelin-specific receptor on muscle cells — independent of GH release or systemic effects.
Quick Facts
What This Study Found
GH secretagogues directly modulated skeletal muscle electrical excitability and contractile properties through a muscle-specific ghrelin-type receptor, independent of GH release — revealing direct muscle-targeting activity.
Key Numbers
How They Did This
In-vitro study using isolated rat skeletal muscle. GH secretagogue effects on membrane potential, action potential parameters, and contractile force measured by intracellular recording and force transduction.
Why This Research Matters
Direct muscle effects mean GH secretagogues could improve muscle function even in conditions where GH itself doesn't work well (like GH resistance in critical illness).
The Bigger Picture
GH secretagogues affect muscle through at least two mechanisms: systemic GH release AND direct muscle receptor activation. This dual mechanism may explain their strong muscle-building reputation.
What This Study Doesn't Tell Us
In-vitro isolated muscle. Whether these direct effects are clinically significant in vivo alongside GH-mediated effects needs determination.
Questions This Raises
- ?Does direct muscle receptor activation contribute significantly to in-vivo muscle effects?
- ?Could muscle-selective GHS-R agonists be developed for sarcopenia?
- ?Is the muscle receptor the same as the pituitary GHS-R or a different subtype?
Trust & Context
- Key Stat:
- Direct muscle action GH secretagogues have their OWN receptor on muscle cells, changing electrical and contractile properties independently of GH — dual mechanism for muscle benefit
- Evidence Grade:
- Preliminary in-vitro evidence from isolated muscle with clear electrophysiological and contractile data demonstrating direct receptor-mediated effects.
- Study Age:
- Published in 2003. Direct ghrelin receptor effects on skeletal muscle have been further characterized.
- Original Title:
- Growth hormone secretagogues modulate the electrical and contractile properties of rat skeletal muscle through a ghrelin-specific receptor.
- Published In:
- British journal of pharmacology, 139(3), 575-84 (2003)
- Authors:
- Pierno, Sabata, De Luca, Annamaria(2), Desaphy, Jean-François, Fraysse, Bodvael, Liantonio, Antonella, Didonna, Maria Paola, Lograno, Marcello, Cocchi, Daniela, Smith, Roy G, Camerino, Diana Conte
- Database ID:
- RPEP-00854
Evidence Hierarchy
Frequently Asked Questions
Do GH peptides work on muscle directly?
Yes — this study shows they have their own receptor on muscle cells. They change muscle electrical activity and contractile force directly, without needing growth hormone as a middle step.
Is this why GH peptides build muscle?
It's likely part of the reason. GH peptides build muscle through both GH release (systemic effect) AND direct muscle receptor activation (local effect). This dual mechanism may explain their strong muscle-building reputation.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-00854APA
Pierno, Sabata; De Luca, Annamaria; Desaphy, Jean-François; Fraysse, Bodvael; Liantonio, Antonella; Didonna, Maria Paola; Lograno, Marcello; Cocchi, Daniela; Smith, Roy G; Camerino, Diana Conte. (2003). Growth hormone secretagogues modulate the electrical and contractile properties of rat skeletal muscle through a ghrelin-specific receptor.. British journal of pharmacology, 139(3), 575-84.
MLA
Pierno, Sabata, et al. "Growth hormone secretagogues modulate the electrical and contractile properties of rat skeletal muscle through a ghrelin-specific receptor.." British journal of pharmacology, 2003.
RethinkPeptides
RethinkPeptides Research Database. "Growth hormone secretagogues modulate the electrical and con..." RPEP-00854. Retrieved from https://rethinkpeptides.com/research/pierno-2003-growth-hormone-secretagogues-modulate
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.