The disulfide isomerase ERp57 is required for fibrin deposition in vivo.

The disulfide isomerase ERp57 is required for fibrin deposition in vivo.
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DOI:
10.1111/jth.12709
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发表时间:
2014-11
期刊:
Journal of thrombosis and haemostasis : JTH
影响因子:
--
通讯作者:
Essex DW
Essex DW
中科院分区:
其他
文献类型:
--
作者:
Zhou J;Wu Y;Wang L;Rauova L;Hayes VM;Poncz M;Essex DW

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ERp57 是血小板功能所必需的;然而,ERp57 是否有助于纤维蛋白的生成尚不清楚。使用抑制性抗 ERp57 抗体 (Mab1)、Pf4-Cre/ERp57fl/fl 小鼠、Tie2-Cre/ERp57fl/fl 小鼠和 ERp57 突变体,我们分析了 ERp57 在激光诱导血栓形成中的功能。 Pf4-Cre/ERp57fl/fl 小鼠中纤维蛋白沉积减少,与血小板 ERp57 在纤维蛋白生成中的作用一致。随着 Mab1 的输注,纤维蛋白沉积进一步减少,在 Tie2-Cre/ERp57fl/fl 小鼠中,与内皮细胞也有助于纤维蛋白沉积一致。依替比法肽的输注抑制了血小板和纤维蛋白沉积,证实了血小板在纤维蛋白沉积中的作用。重组ERp57的输注纠正了纤维蛋白沉积的缺陷,但没有纠正血小板积累的缺陷,表明ERp57对凝血有直接影响。 Mab1 在体外抑制凝血酶的产生,这与凝血中 ERp57 的要求一致。在 Pf4-Cre/ERp57fl/fl 小鼠、Tie2-Cre/ERp57fl/fl 小鼠和输注 Mab1 的正常小鼠中,血小板积累减少到类似程度。输注完全失活的ERp57或具有非功能性第二活性位点的ERp57可抑制纤维蛋白沉积和血小板积累,表明第二活性位点的异构酶活性是这些过程所必需的。 ERp57 通过多个靶点调节血栓形成。
ERp57 is required for platelet function; however, whether ERp57 contributes to fibrin generation is unknown. Using an inhibitory anti-ERp57 antibody (Mab1), Pf4-Cre/ERp57fl/fl mice, Tie2-Cre/ERp57fl/fl mice, and mutants of ERp57, we analyzed the function of ERp57 in laser-induced thrombosis. Fibrin deposition was decreased in Pf4-Cre/ERp57fl/fl mice consistent with a role for platelet ERp57 in fibrin generation. Fibrin deposition was further decreased with infusion of Mab1 and in Tie2-Cre/ERp57fl/fl mice consistent with endothelial cells also contributing to fibrin deposition. Infusion of eptibifatide inhibited platelet and fibrin deposition, confirming a role for platelets in fibrin deposition. Infusion of recombinant ERp57 corrected the defect in fibrin deposition but not platelet accumulation suggesting a direct effect of ERp57 on coagulation. Mab1 inhibited thrombin generation in vitro consistent with a requirement for ERp57 in coagulation. Platelet accumulation was decreased to a similar extent in Pf4-Cre/ERp57fl/fl mice, Tie2-Cre/ERp57fl/fl mice and normal mice infused with Mab1. Infusion of completely inactivated ERp57 or ERp57 with a nonfunctional second active site inhibited fibrin deposition and platelet accumulation, indicating that the isomerase activity of the second active site is required for these processes. ERp57 regulates thrombosis via multiple targets.
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