Ukr.Biochem.J. 2017; Volume 89, Issue 5, Sep-Oct, pp. 21-31


Ca(2+)-dependent regulation of fibrinolytic system activation on fibrin(ogen) D-domains

T. A. Yatsenko, V. M. Rybachuk, S. M. Kharchenko, T. V. Grinenko

Palladin Instiute of Biochemistry, National Academy of Sciences of Ukraine, Kyiv;

In the present study, we investigated whether calcium content modulation in D-domains of fibrin(ogen) was involved in fibrinolytic process activation. To investigate the effect of Ca2+-dependent changes in D-domains two types of fibrinogen fragments D and cross-linked fibrin fragments DD were obtained from plasmin hydrolysate of human fibrin(ogen): chelator-treated and without chelating agents. The study of plasminogen activation by tissue-type plasminogen activator on D- and DD-fragments had shown the intensification of plasmin formation in case of EDTA pretreatment of fragments. The proenzyme activation rate on DD also increased in the presence of EGTA in concentration-dependent manner. Potentiating effect of EGTA-pretreated DD-fragment on plasminogen activation by tPA was decreased in the presence of Ca2+. Activation rate reduction was observed according to the increase of CaCl2 concentration in the reaction medium. The intensification of plasminogen activation potentiation by chelator-treated fibrin(ogen) D-domain containing fragments and subsequent potentiation decrease in the presence of Ca2+ indicated the requirement of Ca2+-dependent changes in D-domains for plasminogen activation sites exposure and initiation of fibrinolysis.

Keywords: , , , , ,


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