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- W1976225087 endingPage "3599" @default.
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- W1976225087 abstract "Abstract The Tec family kinase Btk plays an important role in the regulation of phospholipase Cγ2 (PLCγ2) downstream of the collagen receptor glycoprotein VI (GPVI) in human platelets. Platelets also express a second member of this family, Tec; however, its function has not been analyzed. To address the role of Tec, we analyzed Btk-/-, Tec-/-, and Btk/Tec double-deficient (Btk-/-/Tec-/-) platelets. Tec-/- platelets exhibit a minor reduction in aggregation to threshold concentrations of collagen or the GPVI-specific agonist collagen-related peptide (CRP), whereas responses to higher concentrations are normal. Tyrosine phosphorylation of PLCγ2 by collagen and CRP is not altered in Tec-/- platelets. However, Btk-/-/Tec-/- platelets exhibit a greater reduction in PLCγ2 phosphorylation than is seen in the absence of Btk, thus revealing an important role for Tec in this situation. Furthermore, Btk-/-/Tec-/- platelets fail to undergo an increase in Ca2+, aggregation, secretion, and spreading in response to collagen or CRP, whereas they aggregate normally to adenosine diphosphate (ADP) and spread on fibrinogen. A residual GPVI signal exists in the Btk-/-/Tec-/- platelets as CRP synergizes with ADP to mediate aggregation. These results demonstrate an essential requirement for Tec and Btk in platelet activation by GPVI and reveal a functional role for Tec in the regulation of PLCγ2 in the absence of Btk. (Blood. 2003;102: 3592-3599)" @default.
- W1976225087 created "2016-06-24" @default.
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- W1976225087 date "2003-11-15" @default.
- W1976225087 modified "2023-09-29" @default.
- W1976225087 title "Tec regulates platelet activation by GPVI in the absence of Btk" @default.
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- W1976225087 doi "https://doi.org/10.1182/blood-2003-04-1142" @default.
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