Letter abstract
Nature Medicine 14, 325 - 330 (2008)
Published online: 17 February 2008 | doi:10.1038/nm1722
Kindlin-3 is essential for integrin activation and platelet aggregation
Markus Moser1, Bernhard Nieswandt2,3, Siegfried Ussar1, Miroslava Pozgajova2 & Reinhard Fässler1
Integrin-mediated platelet adhesion and aggregation are essential for sealing injured blood vessels and preventing blood loss, and excessive platelet aggregation can initiate arterial thrombosis, causing heart attacks and stroke1. To ensure that platelets aggregate only at injury sites, integrins on circulating platelets exist in a low-affinity state and shift to a high-affinity state (in a process known as integrin activation or priming) after contacting a wounded vessel2. The shift is mediated through binding of the cytoskeletal protein Talin to the 
subunit cytoplasmic tail3, 4, 5. Here we show that platelets lacking the adhesion plaque protein Kindlin-3 cannot activate integrins despite normal Talin expression. As a direct consequence, Kindlin-3 deficiency results in severe bleeding and resistance to arterial thrombosis. Mechanistically, Kindlin-3 can directly bind to regions of -integrin tails distinct from those of Talin and trigger integrin activation. We have therefore identified Kindlin-3 as a novel and essential element for platelet integrin activation in hemostasis and thrombosis.
- Department of Molecular Medicine, Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany.
- University of Würzburg, Rudolf Virchow Center, Deutsche Forschungsgemeinschaft Research Center for Experimental Biomedicine, Zinklesweg 10, 97080 Würzburg, Germany.
- Institute of Clinical Biochemistry and Pathobiochemisty, Josef-Schneider-Str. 2, 97078 Würzburg, Germany.
Correspondence to: Reinhard Fässler1 e-mail: faessler@biochem.mpg.de
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