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首页> 外文期刊>Ukrainian Biochemical Journal >Study of the sites of plasminogen molecule which are responsible for inhibitory effect of Lys-plasminogen on platelet aggregation
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Study of the sites of plasminogen molecule which are responsible for inhibitory effect of Lys-plasminogen on platelet aggregation

机译:研究纤溶酶原分子位点对Lys-纤溶酶原抑制血小板聚集的作用

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Plasminogen/plasmin system is involved in such important processes as thrombosis, inflammation and cancer. Plasmin and plasminogen mediate their action through plasminogen-binding proteins on the cell surface. Lys-plasminogen, but not Glu-plasminogen, shows inhibitory effect on platelet aggregation induced by ADP, collagen and thrombin in preparations of both: platelet-rich plasma and washed platelets. We have shown that the kringle domains of Lys-plasminogen mediate interaction of this proenzyme with platelet-surface proteins. The aim of the work is to study the role of certain kringle domains in the inhibitory effect of Lys-plasminogen and to determine possible plasminogen-binding proteins on the platelet surface. All studied plasminogen fragments (K1-3, K4 and K5) abolished the inhibitory effect of Lys-plasminogen on platelet aggregation. We observed that K5 was more effective than K1-3 and K4. Biotin-labeled Lys-plasminogen, Glu-plasminogen and plasminogen fragment K1-3 possessed the highest affinity for actin, whereas the binding of biotin-labeled mini-plasminogen and K4 to actin was negligible. We have suggested that inhibitory effect of Lys-plasminogen is due to the interaction of kringle domains of this proenzyme with membrane-bound proteins which are exposed on the platelet surface during activation and are involved in thrombus formation.
机译:纤溶酶原/纤溶酶系统参与血栓形成,炎症和癌症等重要过程。纤溶酶和纤溶酶原通过细胞表面上的纤溶酶原结合蛋白介导其作用。 Lys-纤溶酶原,而不是Glu-纤溶酶原,对富含血小板的血浆和洗涤过的血小板的制剂均显示出对ADP,胶原蛋白和凝血酶诱导的血小板聚集的抑制作用。我们已经显示,Lys-纤溶酶原的kringle结构域介导该酶与血小板表面蛋白的相互作用。这项工作的目的是研究某些kringle域在Lys-纤溶酶原的抑制作用中的作用,并确定血小板表面可能存在的纤溶酶原结合蛋白。所有研究的纤溶酶原片段(K1-3,K4和K5)都取消了Lys-纤溶酶原对血小板聚集的抑制作用。我们观察到,K5比K1-3和K4更有效。生物素标记的Lys-纤溶酶原,Glu-纤溶酶原和纤溶酶原片段K1-3对肌动蛋白具有最高的亲和力,而生物素标记的微纤溶酶原和K4与肌动蛋白的结合可以忽略不计。我们已经提出,Lys-纤溶酶原的抑制作用是由于该酶的kringle结构域与在活化过程中暴露于血小板表面并参与血栓形成的膜结合蛋白相互作用所致。

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