Induction of the nuclear factor HIF-1alpha in acetaminophen toxicity: evidence for oxidative stress

Biochemical and Biophysical Research Communications
Laura P JamesJ A Hinson

Abstract

Hypoxia inducible factor (HIF) controls the transcription of genes involved in angiogenesis, erythropoiesis, glycolysis, and cell survival. HIF-1alpha levels are a critical determinant of HIF activity. The induction of HIF-1alpha was examined in the livers of mice treated with a toxic dose of APAP (300 mg/kg i.p.) and sacrificed at 1, 2, 4, 8, and 12 h. HIF-1alpha was induced at 1-12 h and induction occurred prior to the onset of toxicity. Pre-treatment of mice with N-acetylcysteine (1200 mg/kg i.p.) prevented toxicity and HIF-1alpha induction. In further studies, hepatocyte suspensions were incubated with APAP (1 mM) in the presence of an oxygen atmosphere. HIF-1alpha was induced at 1 h, prior to the onset of toxicity. Inclusion of cyclosporine A (10 microM), an inhibitor of mitochondrial permeability transition, oxidative stress, and toxicity, prevented the induction of HIF-1alpha. Thus, HIF-1alpha is induced before APAP toxicity and can occur under non-hypoxic conditions. The data suggest a role for oxidative stress in the induction of HIF-1alpha in APAP toxicity.

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