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- W2121124015 abstract "We have shown that immunostimulated astrocytes produce excess nitric oxide (NO) and eventually peroxynitrite (ONOO(-)) that was closely associated with the glucose deprivation-potentiated death of astrocytes. The present study shows that activated p38 MAPK regulates ONOO(-) generation from lipopolysaccharide (LPS) plus interferon-gamma (IFN-gamma)-stimulated astrocytes. LPS+IFN-gamma-induced p38 MAPK activation and ONOO(-) generation were attenuated by SB203580 or SKF-86002, specific inhibitors of p38 MAPK. ONOO(-) generation was blocked by NADPH oxidase inhibitor, diphenyleneiodonium chloride, and nitric oxide synthase (NOS) inhibitor, N omega-nitro-L-arginine methyl ester, suggesting both enzymes are involved in ONOO(-) generation. Inhibition of p38 MAPK suppressed LPS+IFN-gamma-induced NO production through down-regulating inducible form of NOS expression. It also suppressed LPS+IFN-gamma-induced NADPH oxidase activation and eventually, the inducible form of superoxide production. Transfection with dominant negative vector of p38 alpha reduced LPS+IFN-gamma-induced ONOO(-) generation through blocking both iNOS-derived NO production and NADPH oxidase-derived O2(-) production. Our results suggest that activated p38 MAPK may serve as a potential signaling molecule in ONOO(-) generation through dual regulatory mechanisms, involving iNOS induction and NADPH oxidase activation." @default.
- W2121124015 created "2016-06-24" @default.
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- W2121124015 date "2008-05-01" @default.
- W2121124015 modified "2023-09-27" @default.
- W2121124015 title "Activation of p38 MAPK induced peroxynitrite generation in LPS plus IFN-γ-stimulated rat primary astrocytes via activation of iNOS and NADPH oxidase" @default.
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- W2121124015 doi "https://doi.org/10.1016/j.neuint.2007.12.009" @default.
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