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:
影响因子:
--
通讯作者:
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
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.
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影响因子:
3.5
作者:
A. Yamaguchi;N. Yamamoto;H. Kitagawa;K. Tanoue;H. Yamazaki
通讯作者:
H. Yamazaki
DOI:
--
发表时间:
1986
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Sweatt,JD;Blair,IA;Cragoe,EJ;Limbird,LE
通讯作者:
Limbird,LE
影响因子:
20.3
作者:
T. Hato;K. Ikeda;Masaki Yasukawa;A. Watanabe;Yuzuru Kobayashi
通讯作者:
Yuzuru Kobayashi
影响因子:
64.8
作者:
A. Zschauer;C. Breemen;F. Bühler;M. Nelson
通讯作者:
M. Nelson
影响因子:
20.3
作者:
Michael H. Kroll;Andrew I. Schafer
通讯作者:
Michael H. Kroll;Andrew I. Schafer