Linked Life Data

11544322

Source:http://linkedlifedata.com/resource/pubmed/id/11544322

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pubmed-article:11544322pubmed:abstractTextMammalian myeloid and epithelial cells express several kinds of antibacterial peptides (alpha-/beta-defensins and cathelicidins) that contribute to the innate host defense by killing invading micro-organisms. In this study we evaluated the LPS-neutralizing activities of cathelicidin peptides human CAP18 (cationic antibacterial proteins of 18 kDa) and guinea pig CAP11 using the CD14(+) murine macrophage cell line RAW264.7 and the murine endotoxin shock model. Flow cytometric analysis revealed that CAP18 and CAP11 inhibited the binding of FITC-conjugated LPS to RAW264.7 cells. Likewise, Northern and Western blot analyses indicated that CAP18 and CAP11 suppressed LPS-induced TNF-alpha mRNA and protein expression by RAW264.7 cells. Interestingly, CAP18 and CAP11 possessed LPS-binding activities, and they strongly suppressed the interaction of LPS with LPS binding protein that mediates the transport of LPS to CD14 to facilitate the activation of CD14(+) cells by LPS. Moreover, when CAP18 and CAP11 were preincubated with RAW264.7 cells, they bound to the cell surface CD14 and inhibited the binding of FITC-LPS to the cells. Furthermore, in the murine endotoxin shock model, CAP18 or CAP11 administration inhibited the binding of LPS to CD14(+) cells (peritoneal macrophages) and suppressed LPS-induced TNF-alpha expression by these cells. Together these observations indicate that cathelicidin peptides CAP18 and CAP11 probably exert protective actions against endotoxin shock by blocking the binding of LPS to CD14(+) cells, thereby suppressing the production of cytokines by these cells via their potent binding activities for LPS and CD14.lld:pubmed
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pubmed-article:11544322pubmed:articleTitleCathelicidin family of antibacterial peptides CAP18 and CAP11 inhibit the expression of TNF-alpha by blocking the binding of LPS to CD14(+) cells.lld:pubmed
pubmed-article:11544322pubmed:affiliationDepartment of Biochemistry, Juntendo University School of Medicine, Tokyo, Japan. nagaokai@med.juntendo.ac.jplld:pubmed
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