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Circulation:AnxA1可调控血小板功能、促进炎症消融!

2019-08-06 MedSci MedSci原创

缺血再灌注损伤(I/RI)是心血管疾病的常见并发症。处理好有害的I/ RI生成的血栓前和促炎症反应是恢复体内平衡的关键。血小板在血栓形成和炎症的整合中起着至关重要的作用。现研究人员利用药理和遗传学方法,结合小鼠和临床样本,来揭示血小板在血栓炎症中的重要作用。在野生型和AnxA1敲除(AnxA-/-)小鼠中进行大脑中动脉闭塞再灌注处理。用荧光显微镜观察细胞迁移监测光/染料诱导的血栓形成。用空载、An

缺血再灌注损伤(I/RI)是心血管疾病的常见并发症。处理好有害的I/ RI生成的血栓前和促炎症反应是恢复体内平衡的关键。血小板在血栓形成和炎症的整合中起着至关重要的作用。现研究人员利用药理和遗传学方法,结合小鼠和临床样本,来揭示血小板在血栓炎症中的重要作用。

在野生型和AnxA1敲除(AnxA-/-)小鼠中进行大脑中动脉闭塞再灌注处理。用荧光显微镜观察细胞迁移监测光/染料诱导的血栓形成。用空载、AnxA1(3.3mg/kg)、WRW4(1.8mg/kg)或三者来治疗小鼠,检测AnxA1的作用。

静脉镜显示,I/RI后血小板粘附和聚集能力增强,AnxA-/-小鼠表现的更严重。AnxA1直接调控血小板功能(如通过降低血栓素B2和调节磷脂酰丝氨酸表达),以促进I/RI后的大脑保护,并通过降低血小板的活化、聚集和脑血栓形成来有效预防中风。此外,研究人员还发现人和小鼠中风时,血浆AnxA1水平降低,AnxA1可以作用于人血小板,抑制经典的血栓诱导的由内向外的信号事件(如Akt激活),来减少αIIbβ3激活,而且不影响其表面表达。AnxA1还可以选择性的介导细胞表面决定簇(如磷脂酰丝氨酸),通过中性粒细胞来促进血小板吞噬,进而促进血栓分解。

总而言之,AnxA1可通过改变血小板表现来预防大脑I/RI,本研究展示了AnxA1的一个新的作用,即可作为治疗药物,又可作为预防药物,同时也推进了我们对血小板和血栓溶解生理的理解。

原始出处:

Elena Y. Senchenkova, et al.Novel Role for the AnxA1-Fpr2/ALX Signaling Axis as a Key Regulator of Platelet Function to Promote Resolution of Inflammation. https://doi.org/10.1161/CIRCULATIONAHA.118.039345Circulation. 2019;140:319–335

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    2020-01-04 119337457
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    2019-08-06 深海的鱼

    学习学习学习学习

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