Monoclonal antibody AG-1 initiates platelet activation by a pathway dependent on glycoprotein IIb-IIIa and extracellular calcium.

Monoclonal antibody AG-1 initiates platelet activation by a pathway dependent on glycoprotein IIb-IIIa and extracellular calcium.
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单克隆抗体 AG-1 通过依赖于糖蛋白 IIb-IIIa 和细胞外钙的途径启动血小板活化。

DOI:
10.1016/0167-4889(92)90144-z
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发表时间:
1992
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Schafer,AI
Schafer,AI
中科院分区:
--
文献类型:
--
作者:
Kroll,MH;Mendelsohn,ME;Miller,JL;Ballen,KK;Hrbolich,JK;Schafer,AI

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研究了完整人血小板对单克隆抗体AG-1的生化反应。AG-1是一种小鼠IgG单抗,可识别mr21000至29000的一系列血小板膜糖蛋白(Gp),其中之一是抗cd9单抗的mr24000 (p24)受体。AG-1引起血小板聚集和分泌。血小板结合AG-1表现出剂量和时间依赖的磷脂酰肌醇4,5-二磷酸(PIP2)分解,二酰基甘油的产生和磷脂酸(PA)的生成。这些事件与蛋白激酶C (PKC)的激活、细胞内钙的增加和纤维蛋白原结合有关。血小板GpIIb-IIIa单克隆抗体或细胞外EGTA可抑制血小板PA生成和PKC对AG-1的激活,但血小板GpIb单克隆抗体或抑制血小板与5-(n -乙基- n -异丙基)酰胺的Na+/H+交换不能抑制血小板PA生成和PKC激活。血小板胞质游离钙([Ca2+]i)在AG-1的作用下升高,这种升高可被抗GpIIb-IIIa的单克隆抗体(RGDS肽)或螯合细胞外钙抑制。这些结果表明AG-1结合一种独特的血小板表面糖蛋白,通过激活pip2特异性磷脂酶C启动血小板反应,这是通过依赖GpIIb-IIIa和细胞外钙的信号通路发生的。
The biochemical responses of intact human platelets to the monoclonal antibody (mAb) AG-1 were investigated. AG-1 is a murine IgG mAb that recognizes a series of platelet membrane glycoproteins (Gp) fromMr21 000 to 29 000, one of which is theMr24 000 (p24) receptor for anti-CD9 mAbs. AG-1 causes platelet aggregation and secretion. Platelets binding AG-1 demonstrate a dose- and time-dependent breakdown of phosphatidylinositol 4,5-bisphosphate (PIP2), production of diacylglycerol, and generation of phosphatidic acid (PA). These events are associated with the activation of protein kinase C (PKC), an increase in intracellular calcium, and fibrinogen binding. Platelet PA generation and PKC activation in response to AG-1 are inhibited by mAbs to platelet GpIIb-IIIa or by extracellular EGTA, but not by a mAb to platelet GpIb or by inhibiting platelet Na+/H+exchange with 5-(N-ethyl-N-isopropyl)amiloride. Platelet cytoplasmic free calcium ([Ca2+]i) is elevated in response to AG-1, and this elevation is inhibited by mAbs to GpIIb-IIIa, an RGDS peptide or by chelating extracellular calcium. These results suggest that AG-1 binding to a unique platelet-surface glycoprotein initiates platelet responses through the activation of PIP2-specific phospholipase C, and that this occurs through a signal pathway that is dependent on GpIIb-IIIa and extracellular calcium.
血小板活化过程中通过 GPIIb/IIIa 复合物介导的 Ca2 流入
DOI: --
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