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• W2052511175 abstract "Platelet activation by collagen depends principally on two receptors, alpha(2)beta(1) integrin (GPIa-IIa) and GPVI. During this activation, the nonreceptor protein tyrosine kinase pp72(syk) is rapidly phosphorylated, but the precise contribution of alpha(2)beta(1) integrin and GPVI to signaling for this phosphorylation is not clear. We have recently found that proteolysis of platelet alpha(2)beta(1) integrin by the snake venom metalloproteinase, jararhagin, results in inhibition of collagen-induced platelet aggregation and pp72(syk) phosphorylation. In order to verify whether the treatment of platelets with jararhagin had any effect on GPVI signaling, in this study we stimulated platelets treated with either jararhagin or anti-alpha(2)beta(1) antibody with two GPVI agonists, an antibody to GPVI and convulxin. Platelet shape change and phosphorylation of pp72(syk) by both GPVI agonists was preserved, as was the structure and function of GPVI shown by (125)I-labeled convulxin binding to immunoprecipitated GPVI from jararhagin-treated platelets. In contrast, defective platelet aggregation in response to GPVI agonists occurred in both jararhagin-treated and alpha(2)beta(1)-blocked platelets. This apparent cosignaling role of alpha(2)beta(1) integrin for platelet aggregation suggests the possibility of a topographical association of this integrin with GPVI. We found that both platelet alpha(2)beta(1) integrin and GPVI coimmunoprecipitated with alpha(IIb)beta(3) integrin. Since platelet aggregation requires activation of alpha(IIb)beta(3) integrin, defective aggregation in the absence of alpha(2)beta(1) suggests that this receptor may provide a signaling link between GPVI and alpha(IIb)beta(3). Our study therefore demonstrates that platelet signaling leading to pp72(syk) phosphorylation initiated with GPVI engagement by either convulxin or GPVI antibody does not depend on alpha(2)beta(1) integrin. However, alpha(IIb)beta(3) integrin may, in this model, require functional alpha(2)beta(1) integrin for its activation." @default.
• W2052511175 created "2016-06-24" @default.
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• W2052511175 date "2000-02-01" @default.
• W2052511175 modified "2023-09-25" @default.
• W2052511175 title "Distinct Contributions of Glycoprotein VI and α2β1 Integrin to the Induction of Platelet Protein Tyrosine Phosphorylation and Aggregation" @default.
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• W2052511175 doi "https://doi.org/10.1006/abbi.1999.1627" @default.
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