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Abstract:
DDT is a pesticide used in malaria-control programmes throughout the world. Its potential carcinogenicity was studied in MRC Porton rats (Wistar-derived) which received dietary concentrations of 0, 125, 250 and 500 parts per million DDT (technical-grade) for life. The treatment had no adverse effects on body growth or survival rate. Various types of tumours were observed in animals in all groups: exposure to DDT resulted in statistically significant increased incidence of liver-cell tumours only in female treated rats; one such tumour was observed in control rats. No metastases of these tumours were found.
Insights
DDT exposure in rats did not affect survival but increased liver tumors in females. Further research is needed to understand DDT
Area of Science:
- Toxicology
- Environmental Health
- Oncology
Background:
- DDT (Dichlorodiphenyltrichloroethane) is a widely used pesticide in global malaria control programs.
- Concerns exist regarding the potential carcinogenicity of DDT exposure.
Purpose of the Study:
- To investigate the potential carcinogenic effects of chronic dietary exposure to DDT in rats.
- To determine if DDT exposure influences tumor development, specifically liver-cell tumors.
Main Methods:
- MRC Porton rats (Wistar-derived) were administered varying dietary concentrations of technical-grade DDT (0, 125, 250, 500 ppm) for their lifetime.
- Body growth, survival rates, and tumor incidence were monitored throughout the study.
- Tumor types and presence of metastases were analyzed.
Main Results:
- DDT administration did not adversely affect rat body growth or survival rates.
- A statistically significant increase in liver-cell tumors was observed exclusively in female rats exposed to DDT.
- Liver tumors were also detected in the control group, indicating spontaneous occurrence.
Conclusions:
- Chronic dietary exposure to DDT at the tested concentrations did not impact overall survival in rats.
- DDT exposure was associated with a significantly higher incidence of liver-cell tumors in female rats.
- The findings suggest a sex-specific carcinogenic potential of DDT concerning liver tumors, warranting further investigation.