Abstract
Arsenic, a common poison, is known to react with sulfide in vivo, forming thioarsenates. The acute toxicity of the inorganic thioarsenates is currently unknown. Our experiments showed that a fourfold sulfide excess reduced acute arsenite cytotoxicity in human hepatocytes (HepG2) and urothelial cells (UROtsa) significantly, but had little effect on arsenate toxicity. Speciation analysis showed immediate formation of thioarsenates (up to 73 % of total arsenic) in case of arsenite, but no speciation changes for arsenate. Testing acute toxicity of mono- and trithioarsenate individually, both thioarsenates were found to be more toxic than their structural analogue arsenate, but less toxic than arsenite. Toxicity increased with the number of thio groups. The amount of cellular arsenic uptake after 24 h corresponded to the order of toxicity of the four compounds tested. The dominant to almost exclusive intracellular arsenic species was arsenite. The results imply that thiolation is a detoxification process for arsenite in sulfidic milieus. The mechanism could either be that thioarsenates regulate the amount of free arsenite available for cellular uptake without entering the cells themselves, or, based on their chemical similarity to arsenate, they could be taken up by similar transporters and reduced rapidly intracellularly to arsenite.
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Acknowledgments
We acknowledge generous funding by the German Research Foundation within the Emmy Noether program to B. Planer-Friedrich (grant # PL 302/3-1) and thank Stefan Will for help with AEC-ICP-MS analyses.
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Data about instrumental parameters for the separation of arsenic species by anion exchange chromatography is available in Online Resource Table SI-1; arsenic speciation data (intracellular and in cell growth medium) after 24 h exposure to the four investigated arsenic compounds are available in Online Resource Figures SI-1 and SI-2.
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Hinrichsen, S., Lohmayer, R., Zdrenka, R. et al. Effect of sulfide on the cytotoxicity of arsenite and arsenate in human hepatocytes (HepG2) and human urothelial cells (UROtsa). Environ Sci Pollut Res 21, 10151–10162 (2014). https://doi.org/10.1007/s11356-014-2950-4
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DOI: https://doi.org/10.1007/s11356-014-2950-4