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Bacterial quorum sensing molecule induces chemotaxis of human neutrophils via induction of p38 and leukocyte specific protein 1 (LSP1)

Abstract When bacteria colonize surfaces, they socialize and form biofilms. This process is well regulated and relies on the communication among the bacteria via so-called “quorum sensing molecules”. Among those, N-(3-oxododecanoyl)- l -homoserine lactone (AHL-12), generated by Pseudomonas aeruginos...

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Published in:Immunobiology (1979) 2013-02, Vol.218 (2), p.145-151
Main Authors: Kahle, N.A, Brenner-Weiss, G, Overhage, J, Obst, U, Hänsch, G.M
Format: Article
Language:English
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Summary:Abstract When bacteria colonize surfaces, they socialize and form biofilms. This process is well regulated and relies on the communication among the bacteria via so-called “quorum sensing molecules”. Among those, N-(3-oxododecanoyl)- l -homoserine lactone (AHL-12), generated by Pseudomonas aeruginosa and other Gram-negative bacteria, activates not only bacteria but also interacts with mammalian cells. Among others, it activates phagocytic cells and – as we had shown previously – it is chemotactic for human polymorphonuclear neutrophils (PMN) in vitro . In the present study, we analyzed the signalling pathway of AHL-12 in PMN. We focused on the mitogen activated protein (MAP) kinase p38, because SB203580, an inhibitor of p38, prevented the AHL-12 induced chemotaxis. We found that in response to AHL-12, p38 was phosphorylated within minutes, as was its downstream target, the MAPKAP-Kinase-2 (MK2). In PMN, the major substrate of MK2 is the leukocyte specific protein 1 (LSP1), which binds to F-actin and participates directly in actin polymerization and cell migration. In response to AHL-12, LSP1 was phosphorylated and co-localized with F-actin in polarized PMN, suggesting that AHL-12-induced migration depended on p38 and LSP1 activation.
ISSN:0171-2985
1878-3279
DOI:10.1016/j.imbio.2012.02.004