首页> 外文期刊>Cardiovascular pathology: the official journal of the Society for Cardiovascular Pathology >Clearance of plasmin–PN-1 complexes by vascular smooth muscle cells in human aneurysm of the ascending aorta
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Clearance of plasmin–PN-1 complexes by vascular smooth muscle cells in human aneurysm of the ascending aorta

机译:升压主动脉血管平滑肌细胞血浆-PN-1复合物的清除

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Abstract Plasminogen is a circulating zymogen which enters the arterial wall by radial, transmural hydraulic conductance, where it is converted to plasmin by tissue plasminogen activator t-PA on an activation platform involving S100A4 on the vascular smooth muscle cell (vSMC) membrane. Plasmin is involved in the progression of human thoracic aneurysm of the ascending aorta (TAA). vSMCs protect the TAA wall from plasmin-induced proteolytic injury by expressing high levels of antiproteases. Protease nexin-1 (PN-1) is a tissue antiprotease belonging to the serpin superfamily, expressed in the vascular wall, and is able to form a covalent complex with plasmin. LDL receptor-related protein-1 (LRP-1) is a scavenger receptor implicated in protease–antiprotease complex internalization. In this study, we investigated whether PN-1 and LRP-1 are involved in the inhibition and clearance of plasminogen by the SMCs of human TAA. We demonstrated an overexpression of S100A4, PN-1, and LRP-1 in the medial layer of human TAA. Plasminogen activation taking place in the media of TAA was revealed by immunohistochemical staining and plasmin activity analyses. We showed by cell biology studies that plasmin–PN-1 complexes are internalized via LRP-1 in vSMCs from healthy and TAA media. Thus, two complementary mechanisms are involved in the protective role of PN-1 in human TAA: one involving plasmin inhibition and the other involving tissue clearance of plasmin-PN1 complexes via the scavenger receptor LRP-1. Highlights ? Protection of the arterial wall from the proteases injury. ? The mechanism involved is the clearance of proteases–antiproteases complexes. ? The smooth muscle cells are implicated in protection of arterial wall from protease injury especially in thoracic aneurism.
机译:摘要纤溶酶原是一种循环酶原,其通过径向透射液压传导,通过组织纤溶酶原激活剂T-PA在涉及血管平滑肌细胞(VSMC)膜上的S100a4上的激活平台上转化为纤溶酶。纤溶酶参与了升性主动脉(TAA)的人胸部动脉瘤的进展。 VSMCS通过表达高水平的防滴释放酶保护来自肝素诱导的蛋白水解损伤的Taa壁。蛋白酶Nexin-1(PN-1)是属于血管壁表达的蛇素超家族的组织抗脂肪酶,并且能够与纤溶酶形成共价络合物。 LDL受体相关的蛋白-1(LRP-1)是一种清除剂,其涉及蛋白酶 - 抗磷脂酶复合物内化。在这项研究中,我们研究了PN-1和LRP-1是否参与了人TAA的SMC的抗纤溶酶原的抑制和清除。我们证明了在人为TAA的内侧层中的S100A4,PN-1和LRP-1的过表达。通过免疫组织化学染色和纤溶酶活性分析揭示了TAA培养基中发生的纤溶酶原激活。我们通过细胞生物学研究表明,纤溶酶-PN-1复合物通过来自健康和TAA介质的VSMC中的LRP-1内化。因此,两种互补机制参与人TAA中PN-1的保护作用:一种涉及抗纤溶酶抑制的一种,另一个涉及通过清除剂受体LRP-1的纤溶酶-PN1配合物的组织清除。强调 ?保护动脉壁免受蛋白酶损伤。还所涉及的机制是蛋白酶 - 抗滴鼻酶复合物的间隙。还平滑肌细胞涉及免受蛋白酶损伤的动脉壁,尤其是在胸部动脉中的血液损伤。

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