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• W2027383204 abstract "Reactive oxygen species (ROS) initiate activation of the transcription factor NF-kappaB in a variety of cell systems. Perhaps the most potent biological source of ROS is the NADPH oxidase of phagocytic cells, a multi-component system that catalyzes the formation of superoxide anion. Although phagocytes use this oxidase to kill ingested microorganisms, the products also mediate a broad range of biological oxidation reactions and some evidence exists for activation of NF-kappaB through this mechanism. Moreover, the components of the phagocyte NADPH oxidase are present in certain non-phagocytic cells and recently discovered homologues of the catalytic component gp91(phox) are expressed in a number of tissues. We explored the hypothesis that the products of NADPH oxidases cause the activation of NF-kappaB. K562 human erythrokeukemia cells transfected with constructs for expression of gp91(phox), plus other essential NADPH oxidase components generated substantial amounts of superoxide when activated with phorbol ester, lesser amounts with arachidonic acid exposure, and none with TNFalpha. Gel shift assays demonstrated induction of NF-kappaB in K562 cells exposed to TNFalpha and specificity was shown by oligonucleotide competition. Supershift assays demonstrated the presence in nuclear complexes of the NF-kappaB components p65/RelA and p50. Nuclear complexes of identical electrophoretic mobility were induced in phorbol ester-stimulated K562 cells that expressed the complete NADPH oxidase system, but not in cells lacking one of the essential oxidase components. K562 cells were relatively resistant to NF-kappaB induction by exogenous peroxide, but certain other cell types (HEK293 and HeLaS3) demonstrated such induction upon exposure to reagent hydrogen peroxide or glucose oxidase plus glucose and this was blocked by catalase. Finally, we found a biphasic pattern of gp91(phox) expression in rat liver during aging. High levels observed in young animals decreased in middle age, but increased again in old age. Collectively, these studies demonstrate the potential for NADPH-dependent induction of NF-kappaB and raise the possibility of a role for this pathway in the biology of aging." @default.
• W2027383204 created "2016-06-24" @default.
• W2027383204 creator A5034515720 @default.
• W2027383204 creator A5084488961 @default.
• W2027383204 date "2004-10-01" @default.
• W2027383204 modified "2023-09-23" @default.
• W2027383204 title "Nuclear factor kappa B activation by NADPH oxidases" @default.
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• W2027383204 doi "https://doi.org/10.1016/j.mad.2004.08.009" @default.
• W2027383204 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15541774" @default.
• W2027383204 hasPublicationYear "2004" @default.
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