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Blood lead and cadmium levels in occupationally exposed workers and their effect on markers of DNA damage and repair

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Abstract

Occupational exposure to heavy metals like lead and cadmium causes a wide range of biological effects and may elevate the risk of genetic damage. Heavy metal toxicity is now becoming a significant public health problem. There are many discrepancies in the results of the studies on the genotoxicity of heavy metals. Therefore, the study aimed to estimate lead, cadmium, and 8-OHdG levels (8-hydroxy-2-deoxyguanosine) and expression of DNA repair gene OGG1 (8-oxoguanine DNA glycosylase 1) in occupationally heavy metal exposed workers. The study comprised 100 workers, occupationally exposed to lead and cadmium from different factories and 100 controls without history of metal exposure. The lead and cadmium mean ± SD were 5.69 ± 12.07 µg/dL and 3.44 ± 1.33 µg/L in the cases and 1.27 ± 1.10 µg/dL and 1.07 ± 0.67 µg/L in the controls. The 8-OHdG concentration was significantly higher in the cases than the controls. Cadmium showed a significant positive correlation with 8-OHdG in the cases. The expression of OGG1 was significantly down-regulated in the cases compared to the controls. Lead levels did not show any significant correlation with OGG1, whereas cadmium level had a significant positive correlation with OGG1 in the cases. To conclude, the exposure to heavy metals is associated with increased oxidative DNA damage and impaired expression of the DNA repair gene, OGG1.

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Author notes

  1. Preeti Singh and Prasenjit Mitra Co-first authors; Both the authors have equally contributed to the work.

Authors and Affiliations

  1. Department of Biochemistry, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India

    Preeti Singh, Prasenjit Mitra, Taru Goyal, Shailja Sharma & Praveen Sharma

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  1. Preeti Singh
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  2. Prasenjit Mitra
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  3. Taru Goyal
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  4. Shailja Sharma
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  5. Praveen Sharma
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Correspondence to Praveen Sharma.

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Singh, P., Mitra, P., Goyal, T. et al. Blood lead and cadmium levels in occupationally exposed workers and their effect on markers of DNA damage and repair. Environ Geochem Health 43, 185–193 (2021). https://doi.org/10.1007/s10653-020-00696-y

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