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DNA damage in workers exposed to lead using comet assay.
K Danadevi1, Roya Rozati, B Saleha Banu
1Owaisi Hospital and Research Center, Deccan College of Medical Sciences, Hyderabad, Andhra Pradesh, India.
Toxicology
|April 18, 2003
Summary
Occupational lead (Pb) exposure in secondary recovery workers significantly increased DNA damage, as shown by the comet assay. Higher blood lead levels and longer exposure correlated with greater genotoxicity in these individuals.
Area of Science:
- Environmental Health
- Toxicology
- Occupational Medicine
Background:
- Lead (Pb) is a pervasive toxic metal with known health risks.
- Workers in secondary lead recovery units face potential occupational exposure.
- Assessing genotoxic effects is crucial for understanding lead's impact on these workers.
Purpose of the Study:
- To evaluate the genotoxic effects of lead exposure in secondary lead recovery unit workers.
- To correlate blood lead levels and exposure duration with DNA damage.
- To determine the efficacy of the comet assay in assessing lead-induced genotoxicity.
Main Methods:
- Blood lead levels were measured using ICP-MS in 45 exposed workers and 36 controls.
- DNA damage in blood leucocytes was assessed using the alkali single cell gel electrophoresis (comet) assay.
- Environmental lead concentration in the workplace air was also measured.
Main Results:
- Exposed workers had significantly higher mean blood lead levels (248.3 µg/l) than controls (27.49 µg/l).
- A significantly higher percentage of cells with DNA damage (44.58%) was found in exposed workers compared to controls (21.14%).
- Lead content and years of exposure strongly correlated with DNA damage in the exposed group.
Conclusions:
- Occupational lead exposure in secondary recovery workers leads to significant genotoxic effects.
- The comet assay is a valuable tool for evaluating lead-induced DNA damage in humans.
- Further protective measures are warranted for workers in lead-exposed environments.