Impaired alpha(IIb)beta(3) integrin activation and shear-dependent thrombus formation in mice lacking phospholipase D1.

Impaired alpha(IIb)beta(3) integrin activation and shear-dependent thrombus formation in mice lacking phospholipase D1.
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缺乏磷脂酶D1的小鼠中的α(IIB)β(3)整联蛋白活化和剪切依赖性血栓形成。

DOI:
10.1126/scisignal.2000551
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发表时间:
2010-01-05
期刊:
影响因子:
7.3
通讯作者:
Nieswandt B
Nieswandt B
中科院分区:
生物学1区
文献类型:
--
作者:
Elvers M;Stegner D;Hagedorn I;Kleinschnitz C;Braun A;Kuijpers ME;Boesl M;Chen Q;Heemskerk JW;Stoll G;Frohman MA;Nieswandt B

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血小板聚集对止血至关重要,但也可导致心肌梗死和中风。血小板活化中一个关键但了解甚少的步骤是主要黏附受体αIIbβ3整合素功能增强,这使得黏附和聚集得以发生。磷脂酶(PL)在激动剂受体刺激下,裂解膜磷脂以产生脂质第二信使。已确定磷脂酶C(PLC)在血小板活化中起重要作用,但磷脂酶D(PLD)及其产物磷脂酸的作用尚未确定。在此,我们报道了Pld1 - / - 小鼠的产生,并表明它们的血小板在对经典激动剂作出反应时,αIIbβ3整合素活化受损,且在高剪切流条件下糖蛋白Ib依赖性聚集体形成存在缺陷。这种缺陷导致对血栓形成和缺血性脑梗死具有保护作用,而不影响尾部出血时间。这些结果表明,PLD1可能是缺血性心血管和脑血管事件中血小板活性的关键调节因子。
Platelet aggregation is essential for hemostasis, but can also cause myocardial infarction and stroke. A key but poorly understood step in platelet activation is increased function of the major adhesive receptor, αIIbβ3 integrin, which enables adhesion and aggregation. Phospholipases (PL), in response to agonist receptor stimulation, cleave membrane phospholipids to generate lipid second messengers. An essential role in platelet activation has been established for PLC, but not for PLD and its product phosphatidic acid. Here, we report the generation of Pld1−/− mice and show that their platelets display impaired αIIbβ3 integrin activation in response to classic agonists, and defective glycoprotein Ib-dependent aggregate formation under high shear flow conditions. This defect resulted in protection from thrombosis and ischemic brain infarction, without affecting tail bleeding times. These results indicate that PLD1 may be a critical regulator of platelet activity in the setting of ischemic cardiovascular and cerebrovascular events.
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