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Evaluation of plasma arsenicals as potential biomarkers of exposure to inorganic arsenic

Abstract

Exposure to inorganic arsenic (iAs) remains a global public health problem. Urinary arsenicals are the current gold-standard for estimating both iAs exposure and iAs metabolism. However, the distribution of these arsenicals may differ between the urine and target organs. Instead, plasma arsenicals may better represent internal dose and capture target organ exposure to arsenicals. Drinking water iAs, plasma and urinary arsenicals were quantified in individuals living in the Zimapan and Lagunera regions of Mexico. The relationship between drinking water iAs and plasma arsenicals was examined using both Spearman correlations and multivariable linear regression models. In addition, the distribution of arsenicals in plasma and urine was examined and the association between plasma and urinary arsenicals was assessed using both Spearman correlations and multivariable linear regression models. Levels of iAs in drinking water were significantly associated with plasma arsenicals in unadjusted and adjusted analyses and the strength of these associations was similar to that of drinking water iAs and urinary arsenicals. These results suggest that plasma arsenicals are reliable biomarkers of iAs exposure via drinking water. However, there were notable differences between the profiles of arsenicals in the plasma and the urine. Key differences between the proportions of arsenicals in plasma and urine may indicate that urine and plasma arsenicals reflect different aspects of iAs toxicokinetics, including metabolism and excretion.

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Acknowledgements

Funding for this work was provided by the National Institute of Environmental Health Sciences (T32-ES007018 and 5R01-ES015326-02) and the Gillings Innovation Laboratory.

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Correspondence to Mirek Styblo or Rebecca C. Fry.

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Bommarito, P.A., Beck, R., Douillet, C. et al. Evaluation of plasma arsenicals as potential biomarkers of exposure to inorganic arsenic. J Expo Sci Environ Epidemiol 29, 718–729 (2019). https://doi.org/10.1038/s41370-019-0121-x

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