Abstract
The problem of the currently used routine genotoxicity tests is relatively low predictivity of in vitro tests for in vivo genotoxicity and carcinogenicity. An important reason is considered to be inadequate expression of xenobiotic-metabolizing enzymes in indicator cell lines. The aim of our study was to generate metabolically active differentiated hepatic progenies (hDHP) from human adipose tissue-derived mesenchymal stem cells (hASC) for genotoxicity testing. hDHP, generated using a three-step hepatic differentiation procedure, expressed hepatic properties such as glycogen storage and albumin secretion. The results of the comet assay demonstrated comparable sensitivity of hASC and hDHP to detect DNA damage induced by a direct acting genotoxic agent tert-butylhydroperoxide. Exposure to model indirect acting genotoxins benzo(a)pyrene, aflatoxin B1, and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine did not induce DNA damage in hASC, while hDHP cells detected DNA damage induced by benzo(a)pyrene and aflatoxin B1, indicating their metabolic activity. The gene and protein expression analysis confirmed the presence of key enzymes involved in metabolism of the three genotoxins in hDHP cells. Moreover, the exposure of hDHP to the model pro-carcinogens altered the expression of selected metabolic genes. hDHP were further immortalized with hTERT transfection, resulting in a stable cell line that can be matured to metabolically active hDHP ready for genotoxicity testing in only 2 weeks. The advantage of these immortalized cells is their prolonged replicative life span and consequently limitless supply of hDHP cells. We conclude that hDHP cells have a great potential for the application in the routine genotoxicity testing and are therefore worth further investigations.
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Acknowledgements
This study was financially supported by Slovenian Research Agency: the research core funding P1-0254, the project J6730, and MR-JTomc. It was also supported by the hCOMET COST Action (CA15132).
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Tomc, J., Kološa, K., Žegura, B. et al. Adipose tissue stem cell-derived hepatic progenies as an in vitro model for genotoxicity testing. Arch Toxicol 92, 1893–1903 (2018). https://doi.org/10.1007/s00204-018-2190-3
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DOI: https://doi.org/10.1007/s00204-018-2190-3