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Genotoxic effect of lead nitrate on mice using SCGE (comet assay)
1Toxicology Unit, Biology and Biotechnology Division, Indian Institute of Chemical Technology, Hyderabad, India.
Abstract:
Single stranded DNA breakage induced by lead nitrate in mice has been studied in vivo using alkaline single cell gel electrophoresis (comet assay). Mice were administered orally 0.7, 1.4, 2.8, 5.6, 11. 2, 22.4, 44.8 and 89.6 mg/kg body weight of lead nitrate and the assay was performed on whole blood at 24, 48, 72 h, 1st and 2nd week. Significant increase in mean tail-length of DNA was observed at all time intervals after treatment with lead nitrate when compared to controls. The mean tail-length did not show a dose-related increase and the elevation in the mean tail-length was of a fluctuating type. Increase in mean tail-lengths clearly gives evidence that lead nitrate causes DNA damage effectively. The study indicates that the alkaline comet assay is a sensitive and rapid method to detect DNA damage caused by heavy metals.
Insights
Lead nitrate exposure in mice causes significant DNA damage, as evidenced by increased single-stranded DNA breaks. The alkaline comet assay effectively detects this genotoxicity, highlighting lead
Area of Science:
- Toxicology
- Genetics
- Biochemistry
Background:
- Lead is a toxic heavy metal with known adverse health effects.
- Understanding lead's genotoxic potential is crucial for risk assessment.
- Lead nitrate is a common lead compound used in research.
Purpose of the Study:
- To investigate the in vivo genotoxicity of lead nitrate in mice.
- To evaluate the effectiveness of the alkaline single cell gel electrophoresis (comet assay) in detecting lead-induced DNA damage.
Main Methods:
- Oral administration of varying doses of lead nitrate to mice.
- Analysis of whole blood samples using the alkaline comet assay at multiple time points (24h to 2 weeks).
- Measurement of DNA tail length as an indicator of DNA strand breaks.
Main Results:
- Lead nitrate administration significantly increased DNA strand breaks in mice whole blood compared to controls.
- The increase in DNA damage was observed across all tested time intervals.
- While dose-dependent increases were not consistently observed, the genotoxic effect of lead nitrate was evident.
Conclusions:
- Lead nitrate effectively induces single-stranded DNA breaks in vivo.
- The alkaline comet assay is a sensitive and rapid method for detecting heavy metal-induced DNA damage.
- This study confirms the genotoxic potential of lead and validates the comet assay for environmental monitoring.