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Is nuclear factor erythroid 2-related factor 2 responsible for sex differences in susceptibility to acetaminophen-induced hepatotoxicity in mice? | LitMetric

Is nuclear factor erythroid 2-related factor 2 responsible for sex differences in susceptibility to acetaminophen-induced hepatotoxicity in mice?

Drug Metab Dispos

Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut (P.R.R., S.R., J.E.M.); and Office of Translational Science, Rutgers University, Piscataway, New Jersey (M.J.G.)

Published: October 2014

AI Article Synopsis

Article Abstract

Nuclear factor erythroid 2-related factor 2 (Nrf2) is a transcription factor that positively regulates the expression and activity of cytoprotective genes during periods of oxidative stress. It has previously been shown that some Nrf2 genes are more highly expressed in livers of female than male mice. This could explain previously reported sex-related differences in susceptibility to acetaminophen (APAP) hepatotoxicity in mice, where females show greater resistance to APAP hepatotoxicity. Here, we examined, for the first time, differences in mRNA and protein expression for Nrf2 and a battery of Nrf2-dependent genes in naïve wild-type (WT) and overnight-fasted WT and Nrf2-null male and female mice following APAP treatment. Alanine aminotransferase (ALT) activity was measured as an indicator of hepatotoxicity. Hepatic mRNA and protein levels were measured by quantitative polymerase chain reaction and western blotting, respectively. Contrary to expectations, basal Nrf2 mRNA and protein expression were significantly lower in livers of naïve female than male mice. Although mRNA and/or protein expression of quinone oxidoreductase 1 and multidrug resistance-associated protein 4 was more pronounced in livers of female than male mice under some of the conditions examined, no higher global expression of Nrf2-dependent genes was detected in female mice. Furthermore, ALT activity was significantly elevated in overnight-fasted WT and Nrf2-null male mice following APAP treatment, but no increases in ALT were observed in either genotype of female mice. These results indicate that factors other than Nrf2 are responsible for the lower susceptibility of female mice to APAP hepatotoxicity.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4164975PMC
http://dx.doi.org/10.1124/dmd.114.059006DOI Listing

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