title: The pattern recognition receptor (RAGE) is a counterreceptor for leukocyte integrins: a novel pathway for inflammatory cell recruitment.
abstract: The pattern recognition receptor, RAGE (receptor for advanced glycation endproducts), propagates cellular dysfunction in several inflammatory disorders and diabetes. Here we show that RAGE functions as an endothelial adhesion receptor promoting leukocyte recruitment. In an animal model of thioglycollate-induced acute peritonitis, leukocyte recruitment was significantly impaired in RAGE-deficient mice as opposed to wild-type mice. In diabetic wild-type mice we observed enhanced leukocyte recruitment to the inflamed peritoneum as compared with nondiabetic wild-type mice; this phenomenon was attributed to RAGE as it was abrogated in the presence of soluble RAGE and was absent in diabetic RAGE-deficient mice. In vitro, RAGE-dependent leukocyte adhesion to endothelial cells was mediated by a direct interaction of RAGE with the beta2-integrin Mac-1 and, to a lower extent, with p150,95 but not with LFA-1 or with beta1-integrins. The RAGE-Mac-1 interaction was augmented by the proinflammatory RAGE-ligand, S100-protein. These results were corroborated by analysis of cells transfected with different heterodimeric beta2-integrins, by using RAGE-transfected cells, and by using purified proteins. The RAGE-Mac-1 interaction defines a novel pathway of leukocyte recruitment relevant in inflammatory disorders associated with increased RAGE expression, such as in diabetes, and could provide the basis for the development of novel therapeutic applications.
authors: Department of Internal Medicine I, University Heidelberg, Bergheimer Strasse 58, D-69115 Heidelberg, Germany. triantafyllos.chavakis@med.uni-heidelberg.de
authors: Triantafyllos
authors: T
authors: Chavakis
authors: Angelika
authors: A
authors: Bierhaus
authors: Nadia
authors: N
authors: Al-Fakhri
authors: Darius
authors: D
authors: Schneider
authors: Steffen
authors: S
authors: Witte
authors: Thomas
authors: T
authors: Linn
authors: Mariko
authors: M
authors: Nagashima
authors: John
authors: J
authors: Morser
authors: Bernd
authors: B
authors: Arnold
authors: Klaus T
authors: KT
authors: Preissner
authors: Peter P
authors: PP
authors: Nawroth
mesh_terms: D000818:Animals; D016466:CHO Cells; D006224:Cricetinae; D006801:Humans; D007249:Inflammation / Q000378:metabolism*; D016023:Integrins / Q000378:metabolism*; D007962:Leukocytes / Q000378:metabolism*; D016177:Macrophage-1 Antigen / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D000067759:Receptor for Advanced Glycation End Products; D011971:Receptors, Immunologic / Q000235:genetics / Q000378:metabolism*
chemical_list: D016023:Integrins; D016177:Macrophage-1 Antigen; D000067759:Receptor for Advanced Glycation End Products; D011971:Receptors, Immunologic