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• W2022704490 abstract "The modified two-site model for platelet activation by collagen requires tight binding of platelets to collagen through integrin alpha2beta1, after its prior activation by inside-out signals initiated by GP VI. The inside-out signalling to alpha2beta1 is not well characterized although it is currently accepted that GPVI initiates signals that lead to regulation of this integrin. The aim of the study was to determine the role played by actin polymerization and the Rho family GTPase cdc42 in the regulation of alpha2beta1 integrin. We first show that GPVI- and non-GPVI-dependent signals differentially regulate distribution of alpha2beta1 receptors, where binding of platelets to collagen leads to redistribution of the integrin to areas of contact between platelet and collagen fibre. Binding of platelets to collagen also leads to activation of alpha2beta1 integrin, which is dependent upon actin polymerization and cdc42 activity, since activation is blocked by cytochalasin D and secramine A respectively. Adhesion of platelets to collagen is markedly diminished in the presence of these inhibitors, whereas adhesion to CRP- or fibrinogen-coated surfaces is not affected. Platelet aggregation to collagen, but not CRP or thrombin, is also markedly dependent upon actin polymerization and cdc42 activity. In conclusion these data suggest that actin polymerization and cdc42 are required for activation of integrin alpha2beta1, but not alpha(IIb)beta3, thereby critically regulating platelet adhesion to and activation by collagen. We therefore suggest a further modification to the current two-site two-step model for activation of platelets by collagen, where actin polymerization and cdc42 mediate a critical step in modulating alpha2beta1 activation, possibly through a positive feedback pathway from alpha2beta1 itself." @default.
• W2022704490 created "2016-06-24" @default.
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• W2022704490 date "2008-01-01" @default.
• W2022704490 modified "2023-10-18" @default.
• W2022704490 title "Critical roles for the actin cytoskeleton and cdc42 in regulating platelet integrin<b>α</b>₂<b>β</b>₁" @default.
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• W2022704490 doi "https://doi.org/10.1080/09537100701777303" @default.
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