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- W2088808515 abstract "CXC chemokine-interleukin-8 (IL-8) (CXCL-8) is a potent proinflammatory chemotactic factor that induces important immune responses for antimycobacterial defenses. However, little is known about the biochemical mechanisms by which the mycobacterial antigens upregulate the release of CXCL-8 from human monocytes. In this study, the mechanisms through which Mycobacterium bovis BCG induces CXCL-8 secretion in human monocytes were investigated. We found that M. bovis BCG induced the production of high levels of CXCL-8 by human monocytes. M. bovis-induced CXCL-8 secretion was unaffected by the protein kinase C (PKC) inhibitor bisindolylmaleimide. In contrast, preincubation of the monocytes with the protein tyrosine kinase (PTK) inhibitor genistein resulted in dose-dependent suppression of mycobacteria-induced CXCL-8 secretion. These results were further supported by the fact that treatment of monocytes with herbimycin-A, another well-described inhibitor of PTK activity with a different mechanism of action, significantly diminished the effect of M. bovis on CXCL-8 secretion. In addition, the specificity of this inhibition was demonstrated by the inability of herbimycin-A to block in a significant manner IL-1β induction of CXCL-8. Herbimycin-A significantly blocked tyrosine phosphorylation of p59hck in response to M. bovis. Finally, two specific NF-κB inhibitors, sulfasalazine and caffeic acid phenetyl ester (CAPE), strongly inhibited the production of CXCL-8 by human monocytes infected with M. bovis. These results show intracellular signaling pathways and a transcription factor involved in the M. bovis-mediated upregulation of CXCL-8 biosynthesis and release by human monocytes." @default.
- W2088808515 created "2016-06-24" @default.
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- W2088808515 date "2002-02-01" @default.
- W2088808515 modified "2023-09-27" @default.
- W2088808515 title "Signals Involved in Mycobacteria-Induced CXCL-8 Production by Human Monocytes" @default.
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- W2088808515 doi "https://doi.org/10.1089/107999002753536158" @default.
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