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Comet Assay as an Indirect Measure of Systemic Oxidative Stress
Published on: May 22, 2015
A study on oxidative stress in lead-exposed workers
1Department of Preventive Medicine, School of Public Health, Shanghai Medical University, People's Republic of China. hfu@shmu.edu.cn
Journal of Toxicology and Environmental Health. Part A
|June 22, 1999
Summary
Lead exposure in smelter workers increases oxidative stress, indicated by higher malondialdehyde (MDA) and superoxide dismutase (SOD) levels. This exposure also correlates with enhanced DNA damage, particularly in those who consume alcohol or smoke.
Area of Science:
- Environmental Health
- Toxicology
- Biochemistry
Background:
- Lead exposure is a significant occupational hazard, particularly in secondary smelter industries.
- Oxidative stress and DNA damage are potential mechanisms through which lead exerts toxicity.
- Biomarkers such as blood lead (BPb), urinary lead (UPb), and alpha-aminolevulinic acid (alpha-ALA) are crucial for assessing lead exposure.
Purpose of the Study:
- To investigate the relationship between lead exposure and oxidative stress markers in lead workers.
- To evaluate the potential for lead to induce DNA damage in peripheral blood cells.
- To explore the influence of lifestyle factors like alcohol consumption and smoking on lead toxicity.
Main Methods:
- Collected blood and urine samples from 66 lead workers and 28 controls.
- Measured blood lead (BPb), urinary lead (UPb), and alpha-aminolevulinic acid (alpha-ALA) levels.
- Assessed plasma malondialdehyde (MDA) concentrations and superoxide dismutase (SOD) activity.
- Utilized the single-cell gel electrophoresis (Comet assay) to quantify DNA damage.
Main Results:
- A positive correlation was observed between blood lead levels and increased MDA concentrations and SOD activity.
- Lead exposure was associated with significant DNA damage in peripheral blood cells.
- Combined effects of alcohol consumption or smoking with lead exposure exacerbated DNA damage.
Conclusions:
- Occupational lead exposure induces oxidative stress and DNA damage in smelter workers.
- MDA and SOD can serve as indicators of lead-induced oxidative stress.
- Lifestyle factors significantly modulate the genotoxic effects of lead exposure.
