Related Experiment Videos
Organophosphate-based pesticides and genetic damage implicated in bladder cancer
Lucy R Webster1, Geoff H McKenzie, Helen T Moriarty
1School of Biomedical Sciences, Faculty of Health Studies, Charles Sturt University, Wagga Wagga, Australia.
Abstract:
Organophosphate-based pesticides have been associated with pathology and chromosomal damage in humans. There are also epidemiologic links with cancer. The few screening tests for low-level occupational exposure are of doubtful sensitivity; this investigation evaluated four methods. Blood samples were studied from 10 farmers before and after occupational exposure to organophosphate-based pesticides and five unexposed controls. The standard cholinesterase test was insensitive to the exposure (P=0.815). However, a significant increase in Howell-Jolly bodies within erythrocytes was observed (P=0.001). Cytogenetic studies on routine and aphidicolin-induced blood cultures revealed that following organophosphate exposure the total number of gaps and breaks on human chromosomes was significantly increased (P=0.004 and P=0.0006, respectively). We concluded that Howell-Jolly body and fragile site analysis were sensitive indicators of nuclear damage resulting from low-level occupational exposure to organophosphate. Such nuclear damage could be implicated in carcinogenesis. The development of bladder cancer is one such example.
Insights
Organophosphate pesticides can cause cell damage. New tests show Howell-Jolly bodies and chromosome breaks are sensitive indicators of low-level occupational exposure to these harmful chemicals.
Area of Science:
- Environmental Health
- Toxicology
- Genetics
Background:
- Organophosphate pesticides are linked to human pathology, chromosomal damage, and cancer.
- Existing screening tests for low-level occupational exposure to organophosphates lack sensitivity.
- Understanding the impact of occupational pesticide exposure is crucial for public health.
Purpose of the Study:
- To evaluate sensitive biomarkers for detecting low-level occupational exposure to organophosphate pesticides.
- To compare the sensitivity of the standard cholinesterase test with other methods.
- To investigate the potential of Howell-Jolly bodies and chromosome aberrations as indicators of organophosphate-induced nuclear damage.
Main Methods:
- Blood samples were collected from 10 farmers before and after occupational exposure to organophosphates and from 5 unexposed controls.
- Assessed the standard cholinesterase test for sensitivity.
- Analyzed Howell-Jolly bodies in erythrocytes and performed cytogenetic studies (routine and aphidicolin-induced) on blood cultures to detect chromosomal damage.
Main Results:
- The standard cholinesterase test showed no significant difference between exposed and unexposed groups (P=0.815).
- A significant increase in Howell-Jolly bodies was observed in erythrocytes post-exposure (P=0.001).
- Organophosphate exposure led to a significant increase in chromosomal gaps (P=0.004) and breaks (P=0.0006).
Conclusions:
- Howell-Jolly body count and fragile site analysis are sensitive indicators of nuclear damage from low-level organophosphate exposure.
- This nuclear damage may be implicated in carcinogenesis, potentially contributing to cancers like bladder cancer.
- These findings suggest improved methods for monitoring occupational pesticide exposure and its health risks.