Abstract

A kinetic scheme for agonist-induced aggregation of blood platelets was formulated in terms of the kinetics of agonist interaction with the nonaggregable, discoid platelets, formation of aggregable forms by shape-change reactions, and interactions among shape-changed forms. Taking into account the relative magnitudes of the rate constants of the different steps and assuming aggregation to be by hydrophobic forces, an equation similar in form to the Michaelis-Menten equation was derived to characterize aggregation kinetics. The kinetic formulation could account for several empirical observations and may be used to interpret kinetic effects of antiplatelet drugs more informatively than at present.

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