...
首页> 外文期刊>Ukrainian Biochemical Journal >Plasminogen modulates formation and release of platelet angiogenic regulators
【24h】

Plasminogen modulates formation and release of platelet angiogenic regulators

机译:纤溶酶原调节血小板血管生成调节剂的形成和释放

获取原文
           

摘要

Platelets store, produce and release a variety of angiogenesis regulators, which can contribute to both normal tissue repair and angiopathy-associated pathologies. Plasminogen has been earlier shown to regulate some platelet functions, but if it is able to modulate angiogenic capacities of platelets is still poorly studied. Thus, the aim of the present study was to evaluate the effects of different plasminogen forms on the formation and secretion of angiogenic protein regulators by platelets. Human washed platelets were obtained by gel-filtration on Sepharose-2B. The levels of P-selectin (CD-62P) exposed on the plasma membrane of untreated and activated platelets was monitored by flow cytometry. Secretion of platelet-derived vascular endothelial growth factor (VEGF) as well as plasminogen fragmentation and angiostatin formation by intact platelets and platelet plasma membranes were analyzed by immunoblotting. It was shown that thrombin or collagen exposure resulted in enhanced P-selectin surface expression by platelets, while Lys-form of plasminogen reduced agonist-induced platelet secretion. Lys-plasminogen, but not Glu-form, inhibited agonist-induced VEGF release from platelets. Activation of platelets significantly accelerated plasminogen cleavage and angiostatin formation. Anti-actin antibodies inhibited plasminogen fragmentation during incubation with platelet plasma membranes indicating surface-exposed actin participation in plasminogen conversion to angiostatins. The present study uncovers a novel function of plasminogen to limit angiogenic potential of platelets via angiostatin formation and inhibition of VEGF secretion.
机译:血小板储存,生产和释放各种血管生成调节剂,这可能有助于正常组织修复和血管病相关病理学。纤溶酶原较早显示调节一些血小板功能,但如果它能够调节血小板的血管生成能力仍然很差。因此,本研究的目的是评估不同纤溶酶原形式对血小板血管生成蛋白调节剂的形成和分泌的影响。通过凝胶过滤在Sepharose-2b上获得人洗的血小板。通过流式细胞术监测暴露在未处理和活化的血小板的质膜上暴露的p-选择素(CD-62P)的水平。通过免疫印迹分析血小板衍生的血管内皮生长因子(VEGF)以及通过完整血小板和血小板血浆膜的纤溶酶原碎片和血管抑制素形成。结果表明,血浆或胶原蛋白暴露导致血小板增强的P-选择蛋白表面表达,而Lys-形式的纤溶酶原诱导的血小板分泌。 Lys-纤溶酶原,但不粘合,抑制血小板的激动剂诱导的VEGF释放。血小板激活显着加速纤溶酶原裂解和血管抑制素形成。抗肌动蛋白抗体在与血小板血浆膜孵育期间抑制纤溶酶原碎片,所述血小板膜表明表面暴露的肌动蛋白参与血浆素转化为血管抑素。本研究揭示了纤溶酶原的新功能,以通过血管素形成和VEGF分泌抑制来限制血小板的血管生成潜力。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号