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• W1482508730 abstract "The involvement of platelet glycoprotein (GP) IIb-IIIa complex in calcium channel activity on the plasma membrane was investigated using an electrophysiological approach. Plasma membrane vesicles were prepared from thrombin-stimulated platelets and incorporated into planar lipid bilayers. Voltage-independent Ca2+ channel currents with a conductance of about 10 pS (in 53 mM Ba2+) were observed, in membranes derived from thrombin-stimulated, but not unstimulated platelet membranes. These channel activities were markedly reduced by exposure of membranes to EGTA at 37 degrees C. This reduction was specifically related to the dissociation of the GPIIb-IIIa complex since preincubation of the membranes with a monoclonal antibody to the GPIIb-IIIa complex (AP-2) could protect the channel activities from the effect of EGTA. Thrombasthenic platelets, which lack the GPIIb-IIIa complex, showed impaired channel activities characterized by decreased open probability and lowered conductance states. Furthermore, when platelets were stimulated by thrombin in the presence of EGTA, AP2, or the synthetic peptide RGDS, to prevent fibrinogen binding to the GPIIb-IIIa complex, open probabilities of the channel currents in these membrane vesicles were also decreased. These results suggest that the GPIIb-IIIa complex is involved in platelet Ca2+ channel activation and that ligand binding to the complex during platelet activation may modify the activation of Ca2+ channels." @default.
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• W1482508730 date "1991-09-01" @default.
• W1482508730 modified "2023-09-29" @default.
• W1482508730 title "Electrophysiological evidence that glycoprotein IIb-IIIa complex is involved in calcium channel activation on human platelet plasma membrane." @default.
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• W1482508730 doi "https://doi.org/10.1016/s0021-9258(18)55307-2" @default.
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