The Body Has Both Opioid AND Anti-Opioid Peptides — A Built-In Balancing Act
The brain produces anti-opioid peptides that naturally counterbalance opioid effects, and these may drive the development of opioid tolerance.
Quick Facts
What This Study Found
The review synthesizes opioid peptide pharmacology including the novel concept of anti-opioid peptides that counterbalance opioid effects and may drive tolerance.
Key Numbers
How They Did This
Narrative review of published literature on opioid and anti-opioid peptide pharmacology, receptor characterization, and physiological roles.
Why This Research Matters
Understanding both opioid and anti-opioid systems is crucial for developing better pain treatments. Anti-opioid peptides may explain why opioid drugs become less effective over time (tolerance).
The Bigger Picture
Understanding anti-opioid systems could transform pain treatment. If tolerance is driven by anti-opioid peptides, blocking them could maintain opioid drug effectiveness without dose escalation.
What This Study Doesn't Tell Us
Narrative review from 1995. Some concepts have been refined or revised since publication. The epsilon receptor's existence remains debated.
Questions This Raises
- ?Could anti-opioid peptide blockers prevent opioid tolerance?
- ?Are anti-opioid systems overactive in chronic pain patients?
Trust & Context
- Key Stat:
- Built-in counter-system Anti-opioid peptides like NPFF naturally oppose opioid effects and may explain why tolerance develops
- Evidence Grade:
- Moderate — comprehensive review synthesizing opioid and anti-opioid pharmacology as of 1995.
- Study Age:
- Published in 1995 (31 years ago). Anti-opioid systems are now recognized as important contributors to tolerance and pain modulation.
- Original Title:
- Opioid and anti-opioid peptides.
- Published In:
- Fundamental & clinical pharmacology, 9(5), 409-33 (1995)
- Authors:
- Cesselin, F
- Database ID:
- RPEP-00317
Evidence Hierarchy
Summarizes existing research on a topic.
What do these levels mean? →Frequently Asked Questions
What are anti-opioid peptides?
They are natural peptides the brain produces that counteract opioid effects. When opioid signaling increases, anti-opioid peptides ramp up to maintain balance — like a thermostat. This may be why opioid drugs lose effectiveness over time.
Could blocking anti-opioids prevent tolerance?
Theoretically, yes. If anti-opioid peptides drive tolerance, blocking them could keep opioid pain medications working at the same dose, preventing the dangerous dose escalation that leads to addiction and overdose.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-00317APA
Cesselin, F. (1995). Opioid and anti-opioid peptides.. Fundamental & clinical pharmacology, 9(5), 409-33.
MLA
Cesselin, F. "Opioid and anti-opioid peptides.." Fundamental & clinical pharmacology, 1995.
RethinkPeptides
RethinkPeptides Research Database. "Opioid and anti-opioid peptides." RPEP-00317. Retrieved from https://rethinkpeptides.com/research/cesselin-1995-opioid-and-antiopioid-peptides
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.