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Microarray analysis of differentially expressed genes in rat frontal cortex under chronic risperidone treatment
Mao-Liang Chen1, Chia-Hsiang Chen
1Institute of Medical Sciences, Tzu-Chi University, Hualien City, Taiwan.
Abstract:
Long-term administration of antipsychotic drugs can induce differential expression of a variety of genes in the brain, which may underscore the molecular mechanism of the clinical efficacy and/or side effects of antipsychotic drugs. We used cDNA microarray analysis to screen differentially expressed genes in rat frontal cortex under 4 weeks' treatment of risperidone (1 mg/kg). Using real-time quantitative PCR, we were able to verify eight genes, whose expression were significantly upregulated in rat frontal cortex under chronic risperidone treatment when compared with control animals. These genes include receptor for activated protein kinase C, amida, cathepsin D, calpain 2, calcium-independent receptor for alpha-latrotoxin, monoamine oxidase B, polyubiquitin, and kinesin light chain. In view of the physiological function of these genes, the results of our study suggest that chronic risperidone treatment may affect the neurotransmission, synaptic plasticity, and proteolysis of brain cells. This study also demonstrates that cDNA microarray analysis is useful for uncovering genes that are regulated by chronic antipsychotic drugs treatment, which may help bring new insight into the molecular mechanism of antipsychotic drugs.
Insights
Chronic risperidone treatment in rats upregulates eight key genes in the frontal cortex, impacting neurotransmission and synaptic plasticity. This reveals potential molecular mechanisms behind antipsychotic drug effects.
Area of Science:
- Neuroscience
- Pharmacology
- Molecular Biology
Background:
- Long-term antipsychotic drug use can alter gene expression in the brain.
- Understanding these changes is crucial for elucidating drug efficacy and side effects.
Purpose of the Study:
- To identify genes differentially expressed in the rat frontal cortex following chronic risperidone treatment.
- To explore the molecular mechanisms underlying antipsychotic drug action.
Main Methods:
- cDNA microarray analysis was employed to screen for gene expression changes.
- Real-time quantitative PCR was used to validate the expression of selected genes.
Main Results:
- Eight genes were significantly upregulated in the frontal cortex after 4 weeks of risperidone treatment.
- Upregulated genes include those involved in protein kinase C signaling, proteolysis, and neurotransmission (e.g., monoamine oxidase B).
Conclusions:
- Chronic risperidone treatment affects neurotransmission, synaptic plasticity, and proteolysis in brain cells.
- cDNA microarray analysis is a valuable tool for discovering drug-regulated genes and understanding antipsychotic mechanisms.
