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Published on: May 12, 2018
Pethidine-induced neuronal apoptosis in rat brain
Guohua Zhang1, Baojie Wang, Xu Wu
1Department of Forensic Pathology, School of Forensic Medicine, China Medical University, 92 Beier Road, Heping District, Shenyang, Liaoning 110001, PR China.
Legal Medicine (Tokyo, Japan)
|March 14, 2009
Summary
Pethidine exposure causes neuronal apoptosis and necrosis, contributing to dependence and tolerance. These brain cell damages are key to understanding pethidine addiction mechanisms.
Area of Science:
- Neuroscience
- Pharmacology
- Cell Biology
Background:
- Pethidine (a synthetic opioid) is widely used for pain management.
- Opioid dependence and withdrawal are significant clinical challenges.
- The cellular mechanisms underlying pethidine dependence are not fully understood.
Purpose of the Study:
- To investigate the effects of chronic pethidine administration on neuronal integrity.
- To explore the relationship between neuronal apoptosis and the development of pethidine dependence and tolerance.
Main Methods:
- Thirty male Sprague-Dawley rats were divided into control, dependence, and withdrawal groups.
- Animals received daily subcutaneous injections of saline or escalating doses of pethidine for 60 days.
- Neuronal apoptosis was assessed using Transmission Electron Microscopy (TEM), TUNEL staining, and immunohistochemistry (IHC) for ncNOS, caspase-3, and Bax.
Main Results:
- Ultrastructural analysis revealed significant neuronal apoptosis and necrosis in pethidine-treated rats.
- TUNEL staining showed increased positive neurons in the cerebral cortex and periaqueductal grey matter.
- IHC analysis demonstrated a distinct increase in ncNOS, caspase-3, and Bax expression in both dependence and withdrawal groups (P<0.05).
Conclusions:
- Chronic pethidine exposure induces significant neuronal apoptosis, degeneration, and necrosis in the rat brain.
- These observed cellular damages are proposed as the pathological basis for pethidine dependence and tolerance.
- Understanding these mechanisms may inform strategies for managing opioid addiction.
