Appetite Suppressant Overrides Opioid-Driven Hunger — But Not Through Serotonin
Dexfenfluramine's appetite-suppressing effect dominated over opioid peptide feeding stimulation in rats, and the interaction did not involve brain serotonin changes.
Quick Facts
What This Study Found
Dexfenfluramine's anorectic effect dominated over opioid agonist feeding stimulation. The interaction was not mediated by brain serotonin turnover changes.
Key Numbers
How They Did This
Rats received central injections of opioid agonists (beta-endorphin, dynorphin, DSLET) or naltrexone, alone or combined with d-FF. Food intake and brain serotonin turnover were measured.
Why This Research Matters
Understanding how appetite-stimulating (opioid) and appetite-suppressing (serotonergic) systems interact is key to developing better weight loss treatments.
The Bigger Picture
Understanding how appetite-stimulating and appetite-suppressing systems interact is key to obesity treatment. This study showed serotonergic appetite suppression can override opioid-driven hunger.
What This Study Doesn't Tell Us
Animal study in rats with central drug administration. Doses and routes do not reflect clinical use. d-FF was later withdrawn from human use due to safety concerns.
Questions This Raises
- ?What mechanism underlies the dexfenfluramine-opioid interaction if not serotonin?
- ?Could combination therapies targeting both systems improve weight loss?
Trust & Context
- Key Stat:
- Suppression dominated stimulation Dexfenfluramine's anorectic effect overrode opioid agonist feeding stimulation without altering brain serotonin turnover
- Evidence Grade:
- Preliminary animal study. The drug was later withdrawn from human use due to safety concerns.
- Study Age:
- Published in 1991. Dexfenfluramine was withdrawn in 1997 due to heart valve problems, but the principles of appetite system interactions remain relevant.
- Original Title:
- Effects of dexfenfluramine and opioid peptides, alone or in combination, on food intake and brain serotonin turnover in rats.
- Published In:
- Pharmacology, biochemistry, and behavior, 38(4), 775-80 (1991)
- Authors:
- Robert, J J, Orosco, M, Rouch, C, Cohen, Y, Jacquot, C
- Database ID:
- RPEP-00208
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Why was dexfenfluramine withdrawn?
It was removed from the market in 1997 because it caused heart valve damage in some patients. However, the appetite research findings remain scientifically valid.
Does this mean serotonin drugs can overcome opioid hunger?
In this model, yes. Serotonergic appetite suppression dominated over opioid-driven feeding. Modern weight loss drugs like lorcaserin (also later withdrawn) worked on similar principles.
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Cite This Study
https://rethinkpeptides.com/research/RPEP-00208APA
Robert, J J; Orosco, M; Rouch, C; Cohen, Y; Jacquot, C. (1991). Effects of dexfenfluramine and opioid peptides, alone or in combination, on food intake and brain serotonin turnover in rats.. Pharmacology, biochemistry, and behavior, 38(4), 775-80.
MLA
Robert, J J, et al. "Effects of dexfenfluramine and opioid peptides, alone or in combination, on food intake and brain serotonin turnover in rats.." Pharmacology, 1991.
RethinkPeptides
RethinkPeptides Research Database. "Effects of dexfenfluramine and opioid peptides, alone or in ..." RPEP-00208. Retrieved from https://rethinkpeptides.com/research/robert-1991-effects-of-dexfenfluramine-and
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.