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Pesticide induced DNA damage and its repair in cultured human cells
Abstract:
The effects of pesticides on the induction of unscheduled DNA synthesis in SV-40 transformed human cells (VA-4) in culture with and without metabolic activation by liver microsomes was studied. Results showed that ten of the thirteen compounds examined either directly or upon metabolic activation induced unscheduled DNA synthesis in the human cell system used. The DNA repair kinetics and size of the repaired regions resulting from treatment with four of the chemicals (Carbaryl, Chlordane, Dieldrin and 2.4-D Fluid) were studied by 313 nm photolysis of repaired regions containing bromodeoxyuridine (BUdR). The size of the repaired regions differed between compounds but could generally be classified as either of the X-ray (short) or UV-type (long).
Insights
This study investigated pesticide effects on human cell DNA repair. Ten of thirteen pesticides induced DNA synthesis, with repair sizes varying by compound.
Area of Science:
- Environmental Toxicology
- Molecular Biology
- Genetics
Background:
- Pesticides are widely used, raising concerns about their potential genotoxicity.
- Understanding DNA repair mechanisms is crucial for assessing chemical safety.
Purpose of the Study:
- To evaluate the genotoxic potential of various pesticides.
- To investigate the induction of unscheduled DNA synthesis (UDS) in human cells.
- To characterize DNA repair kinetics and the size of repaired regions.
Main Methods:
- Utilized SV-40 transformed human cells (VA-4) in cell culture.
- Assessed UDS induction with and without metabolic activation by liver microsomes.
- Employed 313 nm photolysis of bromodeoxyuridine (BUdR)-labeled repaired DNA to study repair kinetics and size.
Main Results:
- Thirteen pesticides were tested; ten induced UDS in human cells, either directly or after metabolic activation.
- DNA repair kinetics and the size of repaired regions were analyzed for Carbaryl, Chlordane, Dieldrin, and 2.4-D Fluid.
- Repaired region sizes varied, falling into categories resembling X-ray (short) or UV-type (long) repair.
Conclusions:
- Several common pesticides exhibit genotoxic effects by inducing DNA repair in human cells.
- Metabolic activation plays a role in the genotoxicity of some pesticides.
- The characterized DNA repair patterns provide insights into the mechanisms of pesticide-induced DNA damage.