A Mutation That Prevents Proper Opioid Peptide Processing Causes Obesity in Mice
Mice with defective carboxypeptidase E (CPE) had impaired processing of multiple opioid and appetite peptides, linking peptide processing dysfunction to obesity development.
Quick Facts
What This Study Found
CPE-fat mice showed impaired prohormone convertase activity resulting in defective processing of opioid peptides (prodynorphin, proenkephalin) and other peptide hormones, linking peptide processing dysfunction to obesity.
Key Numbers
How They Did This
Animal study in CPE-fat/CPE-fat mice analyzing prohormone processing. Multiple peptide precursor and product forms measured in brain and endocrine tissues to assess processing efficiency.
Why This Research Matters
Obesity may not always be about overeating or inactivity — it can result from fundamental defects in how the body processes peptide hormones. This shifts the understanding from behavior to biology.
The Bigger Picture
Peptide hormones must be properly processed from their precursors to function. A single processing enzyme defect can disrupt multiple hormonal systems simultaneously — appetite, pain, mood — causing complex disease.
What This Study Doesn't Tell Us
Single gene mutation model. CPE-fat mice develop obesity late, suggesting compensatory mechanisms exist. The relative contribution of different peptide processing defects to obesity was not determined.
Questions This Raises
- ?Do humans with CPE variants develop obesity?
- ?Which misprocessed peptide is most important for the obesity phenotype?
- ?Could enzyme replacement or peptide supplementation prevent obesity in this model?
Trust & Context
- Key Stat:
- Multi-peptide disruption One enzyme defect impaired processing of dynorphin, enkephalin, and other peptide hormones simultaneously — obesity from broken peptide machinery
- Evidence Grade:
- Preliminary animal evidence from a genetic model with clear molecular characterization of peptide processing defects.
- Study Age:
- Published in 2001. Human CPE variants have been associated with obesity, validating the relevance of this mouse model.
- Original Title:
- Impaired prohormone convertases in Cpe(fat)/Cpe(fat) mice.
- Published In:
- The Journal of biological chemistry, 276(2), 1466-73 (2001)
- Authors:
- Berman, Y(2), Mzhavia, N, Polonskaia, A, Devi, L A
- Database ID:
- RPEP-00649
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Can a processing defect cause obesity?
Yes. This study shows mice with a broken peptide-processing enzyme developed obesity because they couldn't properly produce the hormones that regulate appetite, metabolism, and energy balance.
Does this happen in humans?
Human variants in the CPE gene have been associated with obesity, suggesting the same mechanism operates in people. This shifts some obesity from a behavioral problem to a biochemical one.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-00649APA
Berman, Y; Mzhavia, N; Polonskaia, A; Devi, L A. (2001). Impaired prohormone convertases in Cpe(fat)/Cpe(fat) mice.. The Journal of biological chemistry, 276(2), 1466-73.
MLA
Berman, Y, et al. "Impaired prohormone convertases in Cpe(fat)/Cpe(fat) mice.." The Journal of biological chemistry, 2001.
RethinkPeptides
RethinkPeptides Research Database. "Impaired prohormone convertases in Cpe(fat)/Cpe(fat) mice." RPEP-00649. Retrieved from https://rethinkpeptides.com/research/berman-2001-impaired-prohormone-convertases-in
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.