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- W1519152316 abstract "The capacity of epinephrine alone and the combination of low dose epinephrine and ADP to support the binding of fibrinogen to washed human platelets has been examined, 125I-Fibrinogen was bound to epinephrine-stimulated platelets, but 90 min were required to achieve maximal binding at 22 degrees C in contrast to 20 to 30 min with ADP. The overall rate of interaction appeared to reflect the slow binding of fibrinogen to epinephrine-stimulated platelets as opposed to the rate of stimulation of the cell. Divalent ions were required for binding of fibrinogen to epinephrine-stimulated platelets, and both calcium and magnesium supported binding with a prolonged time course. Fibrinogen binding was maximally supported by 20 to 30 microM epinephrine. The combination of low dose epinephrine (5 microM) and low dose ADP (0.5 microM), which acted synergistically to induce platelet aggregation, supported the rapid (10 min) binding of fibrinogen to platelets. With 4 microM epinephrine, more fibrinogen bound per platelet at all ADP doses than with ADP alone. With all the stimuli, saturable binding of fibrinogen to the platelet was observed, and Scatchard plots were linear, yielding very similar apparent association constants. The number of molecules bound per cell was stimulus-dependent, with 30 microM epinephrine inducing the binding of fewer fibrinogen molecules per cell (mean = 20,400) than 10 microM ADP (mean = 35,900) or the combination of 5 microM epinephrine + 0.5 microM ADP (mean = 43,600). The participation of endogenous ADP in fibrinogen binding to epinephrine-stimulated platelets was suggested since enzymes which remove ADP, apyrase, and creatine phosphate/creatine phosphokinase, and the ADP analogue, 2-chloroadenosine, completely inhibited the binding of fibrinogen to the platelet." @default.
- W1519152316 created "2016-06-24" @default.
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- W1519152316 date "1980-11-01" @default.
- W1519152316 modified "2023-10-18" @default.
- W1519152316 title "Induction of the fibrinogen receptor on human platelets by epinephrine and the combination of epinephrine and ADP." @default.
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- W1519152316 doi "https://doi.org/10.1016/s0021-9258(19)70402-5" @default.
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