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Expression profiling of toxicity pathway genes by real-time PCR array in cypermethrin-exposed mouse brain
Poonam Singh1, Pushpa Lata, Sushila Patel
1Department of Biotechnology, Jamia Hamdard, Hamdard Nagar, New Delhi-110062, India.
Toxicology Mechanisms and Methods
|December 15, 2010
Summary
Cypermethrin exposure alters gene expression and induces oxidative stress in mouse brains, potentially causing DNA damage. This insecticide impacts critical pathways, highlighting complex genotoxic mechanisms.
Area of Science:
- Neurotoxicology
- Molecular Toxicology
- Environmental Health
Background:
- Cypermethrin, a pyrethroid insecticide, is known to cause genotoxicity in the central nervous system.
- Understanding its impact on gene expression in mammals is crucial for risk assessment.
Purpose of the Study:
- To investigate the effects of cypermethrin on gene expression in the Swiss albino mouse brain.
- To identify specific toxicity-related pathways affected by cypermethrin exposure.
Main Methods:
- Transcriptional profiling using pathway-focused real-time PCR arrays.
- Analysis of DNA damage signaling, oxidative stress/antioxidant, and stress/toxicity pathways.
- Biochemical assays for lipid peroxidation, glutathione (GSH) content, and catalase activity.
Main Results:
- Significant modulation (p < 0.05) of 61 genes involved in DNA replication/repair, apoptosis, cell cycle, oxidative stress, and toxicity.
- Cypermethrin exposure led to increased lipid peroxidation (66%) and decreased glutathione (10.6%) and catalase activity (56.7%) in the brain.
- Evidence of induced oxidative stress and altered gene expression related to cellular stress responses.
Conclusions:
- Cypermethrin alters the expression of stress- and toxicity-related genes in the mouse brain.
- The insecticide induces oxidative stress, which may contribute to DNA damage.
- Complex metabolic networks are involved in the genotoxic effects of cypermethrin.
