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- W1054619 abstract "The authors demonstrated that IgG oligomers bind to washed human platelets (P) by an Fc dependent process optimally at low ionic strength (/sup +/0.07) in 3 hrs at 4/sup 0/, while IgG monomer binds immeasurably. The authors studied the modulation of this Fc (IgG) binding site (Rc) on P by measuring /sup 125/I-IgG trimer binding to P at equilibrium and assessing Rc number of affinity. At ..mu.. = 0.07, P expressed 2 fold more Rc than at ..mu.. = 0.15, without a change in affinity; this effect was reversed upon re-exposure of P to ionic strength ..mu.. = 0.15. Equal numbers and affinities of Rc were observed in the presence of either 2mM EDTA, 2 mM EGTA or 2 mM EGTA + 2 mM Mg/sup + +/. Cytochalasin B (10 ..mu..g/ml) did not alter Rc (4987 sites/P, Ka = 0.9 x 10/sup 7/M/sup -1/ vs 5098 sites/P, Ka = 1.1 x 10/sup 7/M/sup -1/). Incubation with P alloreactive plasma at a concentration which depleted 33% of plasma C3, decreased Rc by 50%. However, activation of P by 10..mu..M ADP with Ca/sup + +/, Mg/sup + +/ and 100 ..mu..g/ml fibrinogen did not affect Rc number of affinity (2825 sites/P, Kamore » = 1.1 x 10/sup 7/M/sup -1/ vs 2551 sites/P, Ka = 0.9 x 10/sup 7/M/sup -1/). Thrombin (0.01 - 10 U/ml) also did not alter the number or affinity of Rc. P from 2 patients with thrombastenia expressed normal Rc number and affinity. Binding of IgG trimer to P occurs independent of actin filament interaction, Mg/sup + +/, modulation of P by ADP or thrombin, and of GPIIb/IIIa orGPIIb/IIIa-fibrogen interaction.« less" @default.
- W1054619 created "2016-06-24" @default.
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- W1054619 date "1986-03-01" @default.
- W1054619 modified "2023-09-23" @default.
- W1054619 title "Human platelet Fc (IgG) receptor and its modulation" @default.
- W1054619 hasPublicationYear "1986" @default.
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