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Abstract:
Studies on the carcinogenicity of the insecticide dimethoate in animals were reviewed. Examination of histological sections showed that dimethoate is highly carcinogenic in Osborne-Mendel rats. Neoplasms at all sites, as well as malignant neoplasms, were increased in both low and high doses of dimethoate-treated male rats in the National Cancer Institute study. The malignant neoplasms were both carcinomas and sarcomas. Neoplasms of the endocrine organs, particularly carcinomas, were increased in male and female rats given dimethoate. These carcinomas were observed in the adrenal, thyroid, and pituitary glands. Neoplasms were also increased in the liver of male and female rats and in the reproductive organs of female rats given dimethoate. Male and female rats treated with dimethoate developed monocytic leukemia. There also were toxic changes in rats. Male rats had atrophy of the testes, chronic renal disease, parathyroid hyperplasia, and polyarteritis. Wistar male and female rats given dimethoate by gavage or intramuscularly developed a significant increase in malignant neoplasms, mainly sarcomas, and granulocytic leukemia. AB male and female mice also had an increased incidence of malignant neoplasms and granulocytic leukemia after dermal applications of dimethoate.
Insights
Dimethoate, an insecticide, is highly carcinogenic in animal studies. Research shows it significantly increases cancer risk, including leukemia and various malignant neoplasms in rats and mice.
Area of Science:
- Toxicology
- Carcinogenesis
- Animal Models
Background:
- Insecticide safety evaluations are crucial for public health.
- Understanding the long-term effects of pesticide exposure is essential.
- Previous studies on dimethoate's carcinogenicity warranted further review.
Purpose of the Study:
- To review and synthesize findings on the carcinogenicity of the insecticide dimethoate in animal models.
- To identify specific types and locations of neoplasms induced by dimethoate exposure.
Main Methods:
- Review of histological sections from animal studies.
- Analysis of data from the National Cancer Institute study on dimethoate.
- Examination of carcinogenicity in Osborne-Mendel rats, Wistar rats, and AB mice.
Main Results:
- Dimethoate demonstrated high carcinogenicity in Osborne-Mendel rats, increasing neoplasms at all sites.
- Increased malignant neoplasms (carcinomas, sarcomas) and endocrine organ tumors (adrenal, thyroid, pituitary) were observed in rats.
- Dimethoate exposure led to increased liver and reproductive organ neoplasms in rats, and monocytic or granulocytic leukemia in both rats and mice.
- Toxic effects in male rats included testicular atrophy, renal disease, parathyroid hyperplasia, and polyarteritis.
Conclusions:
- Dimethoate is a potent carcinogen in rodents, inducing a range of malignant neoplasms and leukemia.
- The findings highlight significant toxicological risks associated with dimethoate exposure.
- Further research into the mechanisms of dimethoate-induced carcinogenesis and its implications for human health is warranted.