title: The quorum quenching antibody RS2-1G9 protects macrophages from the cytotoxic effects of the Pseudomonas aeruginosa quorum sensing signalling molecule N-3-oxo-dodecanoyl-homoserine lactone.
abstract: The Gram-negative bacterium Pseudomonas aeruginosa, an opportunistic human pathogen, uses acyl-homoserine lactone-based quorum sensing systems to control its pathogenicity. One of its quorum sensing factors, N-3-oxo-dodecanoyl-homoserine lactone, has been shown not only to mediate bacterial quorum sensing but also to exert cytotoxic effects on mammalian cells. The monoclonal antibody RS2-1G9 generated against a 3-oxo-dodecanoyl-homoserine lactone analogue hapten was able to protect murine bone marrow-derived macrophages from the cytotoxic effects and also prevented the activation of the mitogen-activated protein kinase p38. These data demonstrate that an immunopharmacotherapeutic approach to combat P. aeruginosa infections might be a viable therapeutic option as the monoclonal antibody RS2-1G9 can readily sequester bacterial N-3-oxo-dodecanoyl-homoserine lactone molecules, thus interfering with their biological effects in prokaryotic and eukaryotic systems.
authors.affiliation: Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA.
authors.forename: Gunnar F
authors.initials: GF
authors.lastname: Kaufmann
authors.forename: Junguk
authors.initials: J
authors.lastname: Park
authors.forename: Jenny M
authors.initials: JM
authors.lastname: Mee
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Ulevitch
authors.forename: Kim D
authors.initials: KD
authors.lastname: Janda
mesh_terms: D015107:4-Butyrolactone / Q000031:analogs & derivatives* / Q000276:immunology / Q000378:metabolism; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D002460:Cell Line; D002478:Cells, Cultured; D004789:Enzyme Activation; D006241:Haptens / Q000276:immunology; D006714:Homoserine / Q000031:analogs & derivatives* / Q000276:immunology / Q000378:metabolism; D008264:Macrophages / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D051379:Mice; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism; D011550:Pseudomonas aeruginosa / Q000276:immunology / Q000502:physiology*; D053038:Quorum Sensing / Q000502:physiology*; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D006241:Haptens; C109860:N-(3-oxododecanoyl)homoserine lactone; D006714:Homoserine; C499321:Parp1 protein, mouse; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases; D048051:p38 Mitogen-Activated Protein Kinases; D015107:4-Butyrolactone