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pubmed-article:14970327pubmed:abstractTextMammalian airways protect themselves from bacterial infection by using multiple defense mechanisms including antimicrobial peptides, mucociliary clearance, and phagocytic cells. We asked whether airways might also target a key bacterial cell-cell communication system, quorum-sensing. The opportunistic pathogen Pseudomonas aeruginosa uses two quorum-sensing molecules, N-(3-oxododecanoyl)-l-homoserine lactone (3OC12-HSL) and N-butanoyl-l-homoserine lactone (C4-HSL), to control production of extracellular virulence factors and biofilm formation. We found that differentiated human airway epithelia inactivated 3OC12-HSL. Inactivation was selective for acyl-HSLs with certain acyl side chains, and C4-HSL was not inactivated. In addition, the capacity for inactivation varied widely in different cell types. 3OC12-HSL was inactivated by a cell-associated activity rather than a secreted factor. These data suggest that the ability of human airway epithelia to inactivate quorum-sensing signal molecules could play a role in the innate defense against bacterial infection.lld:pubmed
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pubmed-article:14970327pubmed:articleTitleInactivation of a Pseudomonas aeruginosa quorum-sensing signal by human airway epithelia.lld:pubmed
pubmed-article:14970327pubmed:affiliationPacific Biomedical Research Center, Kewalo Marine Laboratory, 41 Ahui Street, University of Hawaii, Honolulu, HI 96813, USA.lld:pubmed
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pubmed-article:14970327pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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