Abstract
Inorganic arsenic (i-As) is a naturally occurring toxic metalloid affecting millions of people worldwide. It is known to be carcinogen, liver being a potential target, and related to the prevalence of diabetes in arseniasis-endemic areas. Hepatocyte nuclear factor 1 and 4 alpha (HNF1α and HNF4α) are key members of a transcriptional network essential for normal liver architecture. Changes in HNF1α and HNF4α expression are clearly associated with the development of liver malignancies and diabetes in humans. In this work, hepatic HepG2 cells and golden Syrian hamsters were exposed to sub-toxic, environmentally relevant doses of sodium arsenite (SA; up to 10 μM in vitro, 15 mg/L in vivo) in order to evaluate whether arsenic is able to compromise the expression of hepatocyte nuclear factors. Also, liver histopathological examination was carried out, and several markers of hepatocyte differentiation and glucose metabolism status were determined as a measure of i-As-induced effects. Results show a consistent down-regulation of HNF1α and HNF4α under a scenario of exposure where HepG2 cells (1) gained resistance to arsenic-induced toxicity/apoptosis, (2) attained loss of tissue-specific features (as shown by the observed down-regulation of ALDOB, PEPCK and CYP1A2, triggering of the epithelial-to-mesenchymal transition program and the hypersecretion of matrix metalloproteinase-2 and 9), (3) failed to maintain balanced expression of the “stemness” genes C-MYC, OCT3/4, LIN28 and NOTCH2 and (4) showed glucose metabolism impairment. We conclude that the i-As-induced down-regulation of HNF1α and HNF4α under chronic settings may play a central role in the features of disease and cancer observed both in vivo and in vitro.
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Acknowledgments
This work was supported by the “Generalitat de Catalunya” [2009SGR-725], the “Autonomous University of Barcelona” [APOSTA-2011 to A.H] and the “Spanish Ministry of Education and Science” [SAF2008-02933, SAF2011-23146 and FPI-MICINN-2009 to A.P].
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204_2012_948_MOESM2_ESM.tif
Supplementary material Short-term HepG2 exposure to sub-toxic doses of arsenite. Exposure of HepG2 cells to sub-toxic doses of arsenite for 48 h is able to reduce the expression of several members of the Hepatocyte Nuclear Factor (HNF) network at the mRNA (A) and the protein (B) level. Data are presented as mean values or representative experiments (n = 3–6); error bars correspond to 95 % confidence intervals. P values are two-sided (Student-t test). a P < 0.05 compared with time-matched controls. b P < 0.01 compared with time-matched controls. c P < 0.001 compared with time-matched controls. (TIFF 18805 kb)
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Pastoret, A., Marcos, R., Sampayo-Reyes, A. et al. Inhibition of hepatocyte nuclear factor 1 and 4 alpha (HNF1α and HNF4α) as a mechanism of arsenic carcinogenesis. Arch Toxicol 87, 1001–1012 (2013). https://doi.org/10.1007/s00204-012-0948-6
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DOI: https://doi.org/10.1007/s00204-012-0948-6