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Blood, 1 December 2006, Vol. 108, No. 12, pp. 3919-3927. Prepublished online as a Blood First Edition Paper on August 1, 2006; DOI 10.1182/blood-2005-12-030387. This Article Full Text Full Text (PDF) Supplemental Videos and Figures All Versions of this Article: blood-2005-12-030387v1 108/12/3919    most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Schymeinsky, J. Articles by Walzog, B. Search for Related Content PubMed PubMed Citation Articles by Schymeinsky, J. Articles by Walzog, B. Related Collections Cell Adhesion and Motility Signal Transduction Immunobiology Phagocytes Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  PHAGOCYTES The Vav binding site of the non–receptor tyrosine kinase Syk at Tyr 348 is critical for 2 integrin (CD11/CD18)–mediated neutrophil migration Jurgen Schymeinsky, Anca Sindrilaru, David Frommhold, Markus Sperandio, Ronald Gerstl, Cornelia Then, Attila Mócsai, Karin Scharffetter-Kochanek, and Barbara Walzog From the Department of Physiology, Ludwig-Maximilians-University Munich, Germany; Department of Dermatology and Allergic Diseases, University of Ulm, Germany; Department of Pediatrics, Neonatal Unit, University of Heidelberg, Germany; and the Department of Physiology, Semmelweis University School of Medicine, Budapest, Hungary. Leukocyte adhesion via 2 integrins (CD11/CD18) activates the tyrosine kinase Syk. We found that Syk was enriched at the lamellipodium during N-formyl-Met-Leu-Phe–induced migration of neutrophil-like differentiated HL-60 cells. Here, Syk colocalized with Vav, a guanine nucleotide exchange factor for Rac and Cdc42. The enrichment of Syk at the lamellipodium and its colocalization with Vav were absent upon expression of a Syk kinase-dead mutant (Syk K402R) or a Syk mutant lacking the binding site of Vav (Syk Y348F). Live cell imaging revealed that both mutations resulted in excessive lamellipodium formation and severely compromised migration compared with control cells. Similar results were obtained upon down-regulation of Syk by RNA interference (RNAi) technique as well as in Syk–/– neutrophils from wild-type mice reconstituted with Syk–/– bone marrow. A pivotal role of Syk in vivo was demonstrated in the Arthus reaction, where neutrophil extravasation, edema formation, and hemorrhage were profoundly diminished in Syk–/– bone marrow chimeras compared with those in control animals. In the inflamed cremaster muscle, Syk–/– neutrophils revealed a defect in adhesion and migration. These findings indicate that Syk is critical for 2 integrin–mediated neutrophil migration in vitro and plays a fundamental role in neutrophil recruitment during the inflammatory response in vivo. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: A. Utomo, J. Hirahashi, D. Mekala, K. Asano, M. Glogauer, X. Cullere, and T. N. Mayadas Requirement for Vav Proteins in Post-Recruitment Neutrophil Cytotoxicity in IgG but Not Complement C3-Dependent Injury J. Immunol., May 1, 2008; 180(9): 6279 - 6287. [Abstract] [Full Text] [PDF] P. A. Nuzzi, M. A. Senetar, and A. Huttenlocher Asymmetric Localization of Calpain 2 during Neutrophil Chemotaxis Mol. Biol. Cell, March 1, 2007; 18(3): 795 - 805. [Abstract] [Full Text] [PDF] J.-W. Xu, I. Morita, K. Ikeda, T. Miki, and Y. Yamori C-Reactive Protein Suppresses Insulin Signaling in Endothelial Cells: Role of Spleen Tyrosine Kinase Mol. Endocrinol., February 1, 2007; 21(2): 564 - 573. [Abstract] [Full Text] [PDF]

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