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- W4313333684 abstract "Abstract Mycobacterium avium-intracellulare complex (MAC) is one of the most common opportunistic pathogens in HIV-infected patients. Their synergistic interaction leads to a rapid deterioration of the host defense. In vivo, MAC manifests as a disseminated granulomatous disease that produces a massive inflammatory tissue response perhaps through its activation of inflammatory cytokines. The intracellular signaling following interaction of the mycobacterium with host cells is incompletely understood. Because the response is dependent, in part, on the activation of NF-κB, we investigated the effect of MAC on this nuclear transcription factor in cells of macrophage and nonmacrophage lineage. We demonstrate that both high and low virulence strains of MAC potently and rapidly activated NF-κB. In supershift assays, using specific Abs against the NF-κB subunits, we identified a p50/p65 heterodimer that was formed within 5 min after incubation with the bacterium too rapidly for cytokines to be involved in the activation. This activation was instead mediated through the generation of reactive oxygen intermediates, inasmuch as preincubation of cells with a variety of antioxidants inhibited NF-κB activation. Likewise, the transfection of cells with Mn-superoxide dismutase blocked the NF-κB activation induced by the bacterium. These data suggest that NF-κB activation is a consequence of interaction of host cells with the bacterium and that the interaction may play a pivotal role in the pathogenesis of the disease." @default.
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- W4313333684 date "1998-11-01" @default.
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- W4313333684 title "<i>Mycobacterium avium-intracellulare complex</i>Activates Nuclear Transcription Factor-κB in Different Cell Types Through Reactive Oxygen Intermediates" @default.
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- W4313333684 doi "https://doi.org/10.4049/jimmunol.161.9.4834" @default.
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