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Blood, 1 May 2002, Vol. 99, No. 9, pp. 3250-3255

HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY

Constitutive and functional association of the platelet collagen receptor glycoprotein VI-Fc receptor gamma -chain complex with membrane rafts

Yasuharu Ezumi, Kumi Kodama, Takashi Uchiyama, and Hiroshi Takayama

From the Department of Hematology and Oncology, Clinical Sciences for Pathological Organs, Graduate School of Medicine, Kyoto University, Japan.

The platelet collagen receptor glycoprotein (GP) VI-Fc receptor gamma -chain (FcRgamma ) complex transduces signals in an immunoreceptorlike manner. We examined a role for the Triton X-100-insoluble membrane rafts in GPVI-FcRgamma complex signaling. Methyl-beta -cyclodextrin (Mbeta CD)-induced disruption of the membrane rafts inhibited not only platelet aggregation and secretion but also tyrosine phosphorylation of signaling molecules on stimulation through the GPVI-FcRgamma complex. The GPVI-FcRgamma complex was constitutively associated with membrane rafts wherein the Src family kinases and LAT were also present. Their association was not affected by the complex engagement but was highly sensitive to Mbeta CD treatment. Thus, we provide the first evidence that the GPVI-FcRgamma complex is constitutively and functionally associated with membrane rafts.

© 2002 by The American Society of Hematology.
 

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