1. Induction of Neutrophil Chemotaxis by the Quorum-Sensing Molecule N-(3-Oxododecanoyl)-l-Homoserine Lactone
- Author
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Wencke Müller, Ursula Obst, Gerald Brenner-Weiss, Christof Wagner, Sabine Zimmermann, Birgit Prior, Gertrud Maria Hänsch, and Friederike Hug
- Subjects
Cell signaling ,Neutrophils ,Immunology ,Homoserine ,Biology ,Microbiology ,chemistry.chemical_compound ,4-Butyrolactone ,Humans ,Protein kinase C ,Acyl-Homoserine Lactones ,Phospholipase C ,food and beverages ,Chemotaxis ,Bacterial Infections ,Quorum sensing ,Chemotaxis, Leukocyte ,Infectious Diseases ,Biochemistry ,chemistry ,Biofilms ,Pseudomonas aeruginosa ,Parasitology ,Signal transduction ,Signal Transduction - Abstract
Acyl homoserine lactones are synthesized by Pseudomonas aeruginosa as signaling molecules which control production of virulence factors and biofilm formation in a paracrine manner. We found that N -(3-oxododecanoyl)- l -homoserine lactone (3OC12-HSL), but not its 3-deoxo isomer or acyl-homoserine lactones with shorter fatty acids, induced the directed migration (chemotaxis) of human polymorphonuclear neutrophils (PMN) in vitro. By use of selective inhibitors a signaling pathway, comprising phosphotyrosine kinases, phospholipase C, protein kinase C, and mitogen-activated protein kinase C, could be delineated. In contrast to the well-studied chemokines complement C5a and interleukin 8, the chemotaxis did not depend on pertussis toxin-sensitive G proteins, indicating that 3OC12-HSL uses another signaling pathway. Strong evidence for the presence of a receptor for 3OC12-HSL on PMN was derived from uptake studies; by use of radiolabeled 3OC12-HSL, specific and saturable binding to PMN was seen. Taken together, our data provide evidence that PMN recognize and migrate toward a source of 3OC12-HSL (that is, to the site of a developing biofilm). We propose that this early attraction of PMN could contribute to prevention of biofilm formation.
- Published
- 2006