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Updated: Jan 13, 2026
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Methods for Studying the Mechanisms of Action of Antipsychotic Drugs in Caenorhabditis elegans
Published on: February 4, 2014
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Myotube-specific vulnerability to clozapine.
Gloria Buffi1, Mara Fiorani1, Andrea Guidarelli1
1Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy.
Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|October 28, 2025
Summary
Clozapine (CLZ) causes muscle cell death (myotoxicity) by inducing apoptosis in mature muscle cells, but not in muscle stem cells. This selective toxicity explains a rare side effect of this antipsychotic drug.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Clozapine (CLZ) is an atypical antipsychotic for treatment-resistant schizophrenia.
- Serious adverse reactions limit CLZ's clinical use.
- Myotoxicity is a rare, poorly understood CLZ side effect.
Purpose of the Study:
- Investigate the mechanisms of CLZ-induced myotoxicity.
- Determine the effects of CLZ on different muscle cell types.
Main Methods:
- Utilized C2C12-derived myotubes and mouse primary myotubes.
- Assessed morphological and biochemical markers of muscle cell health.
- Examined apoptotic features and cell viability under varying CLZ concentrations and conditions.
- Simulated CLZ protein binding using albumin.
Main Results:
- CLZ induced time- and concentration-dependent toxicity in myotubes.
- Muscle-specific markers and ryanodine receptor activity were reduced by CLZ.
- Apoptotic features were observed in CLZ-treated myotubes.
- Mononuclear reserve cells and myoblasts remained viable and functional, showing resistance to CLZ.
Conclusions:
- CLZ selectively induces apoptosis in mature myotubes.
- Proliferating myoblasts and reserve cells are resistant to CLZ toxicity.
- CLZ myotoxicity is specific to differentiated muscle cells, sparing muscle stem cells.
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