Article: article from journal or magazin.
Heme oxygenase-1 induction by endogenous nitric oxide: influence of intracellular glutathione.
To investigate the influence of glutathione (GSH) on cellular effects of nitric oxide (NO) formation, human colon adenocarcinoma cells were transfected with a vector allowing controlled expression of inducible nitric oxide synthase (iNOS). Protein levels of oxidative stress-sensitive heme oxygenase-1 (HO-1) were analyzed in the presence or absence of GSH depletion using L-buthionine-[S,R]-sulfoximine and iNOS induction. While no effect was observed in the presence of iNOS activity alone, a synergistic effect on HO-1 expression was observed in the presence of iNOS expression and GSH depletion. This effect was prevented by addition of N-methyl-L-arginine. Therefore, targeting of endogenous NO may be modulated by intracellular GSH.
Base Sequence, DNA Primers, Enzyme Induction, Glutathione, Heme Oxygenase (Decyclizing), Humans, Nitric Oxide, Nitric Oxide Synthase, Nitric Oxide Synthase Type II, Tumor Cells, Cultured
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