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Updated: Jun 29, 2026

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
Published on: July 29, 2014
Chronic morphine application is protective against cell death in primary human neurons
Jia Cui1, Qiuyue Chen, Long-Chuan Yu
1Laboratory of Neurobiology and State Key Laboratory of Biomembrane and Membrane Biotechnology, College of Life Sciences, Peking University, Beijing, China.
Morphine surprisingly protects human neurons from cell death by reducing harmful proteins and involving heat shock protein 70. This suggests chronic morphine may aid cell survival, contrary to expectations.
Area of Science:
- Neuroscience
- Cell Biology
- Pharmacology
Background:
- Morphine addiction is a significant societal and medical issue.
- Understanding morphine's cellular effects is crucial for addiction research.
Purpose of the Study:
- To investigate the cellular mechanisms of chronic morphine exposure in human neurons.
- To determine if morphine impacts neuronal survival and cell death pathways.
Main Methods:
- Primary human neurons were cultured.
- Chronic morphine treatment was applied.
- Cytotoxicity assays and analysis of apoptosis-related factors (Bax) and heat shock protein 70 were performed.
Main Results:
- Morphine demonstrated a protective effect against cytotoxicity induced by serum deprivation and staurosporine.
- Morphine treatment led to the downregulation of the proapoptotic factor Bax.
- Heat shock protein 70 was identified as a component involved in morphine's protective action.
Conclusions:
- Chronic morphine application unexpectedly promotes neuronal cell survival.
- The observed neuroprotection involves the modulation of apoptosis pathways and heat shock proteins.
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