[The antifibrinolytic action of the D-dimer fragment]

The effect of D-dimer on the process of plasmin hydrolysis of unstabilized and crosslinked fibrin has been studied. Less degraded early, intermediate, and late products of fibrin cleavage have been revealed by electrophoresis of reduced and nonreduced samples. The molecular mechanism of antifibrinolytic effect of the D-dimer is supposed to be determined by shielding of peptide regions of monomer fibrin, localized both in N-terminal area of beta chain and in alpha, beta, and gamma chains between D and E domains. A notion has been proposed of autoinhibition of fibrinolytic reaction as a phenomenon related to the physical-chemical regulation of fibrinogen transformation into fibrin.