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Organotypic Slice Cultures to Study Oligodendrocyte Dynamics and Myelination
Published on: August 25, 2014
[Effect of propofol on myelin basic protein expression and myelination of oligodendrocytes in neonatal SD rats]
Xin Zhang1, Chunshui Lin1, Peipei Guo1
1Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
Insights
Propofol, a common anesthetic, can harm developing brains. This study shows propofol increases oligodendrocyte apoptosis and reduces myelin basic protein (MBP) synthesis and myelin formation in neonatal rats.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Anesthesiology
Background:
- Propofol is a widely used anesthetic agent, particularly in pediatric procedures.
- Concerns exist regarding the potential neurotoxicity of anesthetics in the developing brain.
- Oligodendrocytes are crucial for myelination, a vital process during brain development.
Purpose of the Study:
- To investigate the impact of varying propofol doses on myelin basic protein (MBP) synthesis.
- To assess the effects of propofol on oligodendrocyte apoptosis and myelination in neonatal rats.
Main Methods:
- Neonatal Sprague-Dawley rats received single intraperitoneal injections of propofol (25, 50, or 100 mg/kg) or vehicle.
- Gene and protein expressions of MBP and caspase-3 were analyzed using qPCR and Western blotting.
- Oligodendrocyte apoptosis and myelination in specific brain regions were evaluated via immunofluorescence assays.
Main Results:
- Propofol administration significantly downregulated MBP mRNA and protein expression in a dose-dependent manner.
- Increased caspase-3 transcription and cleaved caspase-3 protein levels indicated propofol-induced apoptosis.
- Propofol significantly reduced myelin formation in the corpus callosum and internal capsule, with higher doses showing greater effects.
Conclusions:
- Propofol promotes oligodendrocyte apoptosis in a dose-dependent manner in neonatal rats.
- Propofol exposure decreases MBP expression and impairs myelin formation in critical brain structures.
- These findings highlight potential risks of propofol anesthesia on developing white matter.
Objective:
To investigate the effects of different doses of propofol on myelin basic protein (MBP) synthesis and myelination of oligodendrocytes in neonatal SD rats.
Methods:
A total of 57 neonatal SD rats (7 days old) were randomly divided into control group (n=13), vehicle (fat emulsion) group (n=5), and 25, 50 and 100 mg/kg propofol groups (n=13 in each group). Eight hours after a single intraperitoneal injection of propofol or the vehicle, the rats were examined for expressions of mbp mRNA, caspase-3 mRNA, cleaved caspase-3 and MBP in the brain tissues using qPCR and Western blotting. Immunofluorescence assay was used to detect the apoptosis of the oligodendrocytes at 8 h after the injection and the myelination of the corpus callosum and internal capsule at 24 h.
Results:
Compared with the control group, the neonatal rats with propofol injections showed significantly down-regulated expressions of mbp mRNA and MBP protein in the brain tissue (P < 0.05). Propofol dose-dependently increased the transcription level of caspase-3 and the protein levels of cleaved caspase-3 at 8 h after the injection (P < 0.05). Propofol injection significantly increased the apoptosis of the oligodendrocytes, and the effect was significantly stronger in 50 and 100 mg/kg groups than in 25 mg/kg group (P < 0.05). At 24 h after propofol injection, myelin formation was significantly decreased in the corpus callosum of the neonatal rats in 100 mg/kg propofol group and in the internal capsule in 50 and 100 mg/kg groups (P < 0.05).
Conclusions:
In neonatal SD rats, propofol can dose-dependently promote oligodendrocyte apoptosis, decrease MBP expressions in the brain, and suppress myelin formation in the corpus callosum and the internal capsule.
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