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pubmed-article:8261458pubmed:abstractTextInduction of glutathione S-transferase Ya and NAD(P)H:quinone reductase gene expression by a variety of chemical agents is mediated by regulatory elements, EpRE and ARE, composed of two adjacent AP-1-like binding sites and activated by Fos/Jun heterodimeric complex (AP-1). Recent studies show that chemical induction of glutathione S transferase Ya and quinone reductase gene expression is associated with an induction of c-fos and c-jun gene expression and AP-1 binding activity. In this report we present evidence that the AP-1 binding activity and the expression of chloramphenicol acetyltransferase activity from an EpRE Ya-cat gene construct are induced by an increase in intracellular oxidant levels. We observe that lowering the glutathione levels with buthionine sulfoximine, an inhibitor of gamma-glutamylcysteine synthetase, or diamide, a thiol-oxidizing agent, stimulates both basal and chemical-inducible expression of chloramphenicol acetyltransferase activity from EpRE Ya-cat and the AP-1 binding activity. Furthermore, we observe that the induction of these activities by a variety of chemical agents is inhibited by thiol compounds N-acetylcysteine and glutathione. These findings suggest that diverse chemicals that induce the AP-1 complex, leading to the AP-1-mediated transcriptional activation of glutathione S-transferase Ya gene expression, may act through a common mechanism involving the production of reactive oxygen species and depletion of reduced glutathione.lld:pubmed
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pubmed-article:8261458pubmed:articleTitleIntracellular glutathione levels regulate Fos/Jun induction and activation of glutathione S-transferase gene expression.lld:pubmed
pubmed-article:8261458pubmed:affiliationDepartment of Biochemistry, Weizmann Institute of Science, Rehovot, Israel.lld:pubmed
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