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[Protective effect of c-fos antisense oligonucleotides on brain damage induced by glutamate]
1Department of Pediatrics, Xiangya Hospital, Xiangya Medical College of Zhongnan University, Changsha 410008, China.
Objective:
To investigate the relation between glutamate neurotoxicity and c-fos gene expression.
Methods:
c-fos antisense oligonucleotides (AS ODN) was injected into the right lateral ventricles of 9 SD rats to block the c-fos gene expression in brain tissue. c-fos sense oligonucleotides (S ODN) was used a control. The numbers and morphology of neurons in both cerebral cortex and hippocampal CA1 were detected by MIAS-300 image analysing instrument. c-fos gene expression in brain was observed by immunohistochemical method. The content of water and electrolytes in the brain tissue and Ca(2+) in the synapse were measured.
Results:
The c-fos AS ODN blocked the c-fos gene expression and reduced the content of both water and sodium in brain tissue and Ca(2+) in symptosome, thus alleviating the morphological damage in neuron. S ODN did not have such effect.
Conclusion:
c-fos gene expression plays an important role in mediating the effect of glutamate neurotoxicity. Blocking the c-fos gene expression could antagonize glutamate neurotoxicity.
Insights
Blocking c-fos gene expression with antisense oligonucleotides reduced glutamate neurotoxicity in rats. This suggests c-fos plays a key role in excitotoxicity and offers a potential therapeutic target.
Area of Science:
- Neuroscience
- Molecular Biology
- Neurotoxicology
Context:
- Glutamate neurotoxicity is implicated in various neurological disorders.
- The role of immediate early genes, such as c-fos, in excitotoxicity is not fully understood.
- Understanding the molecular mechanisms of glutamate neurotoxicity is crucial for developing effective treatments.
Purpose:
- To investigate the relationship between glutamate neurotoxicity and c-fos gene expression.
- To determine if blocking c-fos gene expression can mitigate glutamate-induced neuronal damage.
Summary:
- Rats received c-fos antisense oligonucleotides (AS ODN) to inhibit c-fos expression, while sense oligonucleotides (S ODN) served as a control.
- AS ODN administration reduced c-fos expression, brain water and sodium content, and synaptic Ca(2+), preserving neuronal morphology.
- S ODN had no significant effect, indicating that the observed neuroprotective effects were specific to c-fos inhibition.
Impact:
- c-fos gene expression is a critical mediator of glutamate neurotoxicity.
- Inhibition of c-fos gene expression demonstrates potential as a therapeutic strategy against glutamate excitotoxicity.
- This research provides insights into the molecular pathways underlying neuronal damage and suggests novel targets for neuroprotection.