In our study of the effect of proline-containing linear di- and tri-peptides (Pro-Gly, Pro-Gly-Pro) and cyclic peptide cPro-Gly in vitro, we have found that they show depolymerizing activity towards the nonstabilized form of fibrin in the presence and in the absence of sigma-aminocapronic acid, an inhibitor of enzymatic fibrinolysis. The peptides have an inhibitory effect on platelet aggregation in platelet-enriched blood plasma, when the process is induced by ADP, they also diminish the activity of factor XIIIa in blood plasma.
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