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[Mechanism of propofol-induced apoptosis in neonatal rat oligodendrocytes]
1Department of Anesthesiology, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China.
Insights
Propofol triggers oligodendrocyte apoptosis by activating caspase proteins and inhibiting anti-apoptotic mechanisms. This study reveals propofol
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Context:
- Propofol is a widely used anesthetic agent.
- Oligodendrocytes are crucial for neuronal function and myelination.
- Understanding propofol's effects on oligodendrocytes is vital for patient safety.
Purpose:
- To elucidate the molecular pathways through which propofol induces apoptosis in oligodendrocytes.
- To investigate the role of caspase family proteins and the PI3K/Akt signaling pathway in propofol-induced oligodendrocyte apoptosis.
Summary:
- Neonatal rats treated with propofol exhibited significantly increased mRNA and protein levels of caspase-3, caspase-8, and caspase-9.
- Propofol administration led to decreased expression of nerve growth factor (NGF) mRNA and phosphorylated PI3K/Akt (P-PI3K/P-PAkt).
- These findings indicate that propofol activates the caspase cascade and suppresses pro-survival signaling, leading to oligodendrocyte apoptosis.
Impact:
- Provides mechanistic insights into propofol neurotoxicity.
- Highlights potential therapeutic targets for mitigating propofol-induced brain injury.
- Informs clinical practice regarding the safe use of propofol in vulnerable populations.
Objective:
To explore the molecular mechanism of propofol-induced apoptosis in oligodendrocytes.
Methods:
Fortyfive neonatal (7 days old) SD rats were randomized into 3 groups (n=15) for a single intraperitoneal injection of saline (control), long chain fat emulsion, or propofol (50 mg/kg). Eight hours after the injection, the rats were examined for mRNA and protein expressions of caspase-3, caspase-8, and caspase-9 in the brain tissues using qPCR and Western blotting, and the expression levels of nerve growth factor (NGF) mRNA and P-PI3K/P-PAkt were also detected.
Results:
Compared with those in the control group, the neonatal rats with propofol injection showed significantly up-regulated mRNA and protein expressions of caspase-3, caspase-8, and caspase-9 in the brain tissue (P<0.05) with significantly down-regulated expressions of NGF mRNA and P-PI3K/P-PAkt (P<0.05).
Conclusion:
Propofol induces apoptosis in oligodendrocytes by activating the caspase family protein members involved in triggering cell apoptosis and inhibiting the anti-apoptosis mechanism.
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