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首页> 外文期刊>The FEBS journal >Dual P2Y(12) receptor signaling in thrombin-stimulated platelets - involvement of phosphoinositide 3-kinase beta but not gamma isoform in Ca2+ mobilization and procoagulant activity
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Dual P2Y(12) receptor signaling in thrombin-stimulated platelets - involvement of phosphoinositide 3-kinase beta but not gamma isoform in Ca2+ mobilization and procoagulant activity

机译:凝血酶刺激的血小板中的双重P2Y(12)受体信号传导-磷酸肌醇3激酶β参与但Ca2 +动员和促凝活性不参与γ亚型

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摘要

During thrombus formation, thrombin, which is abundantly present at sites of vascular injury, activates platelets in part via autocrine-produced ADP. We investigated the signaling pathways by which thrombin and ADP in synergy induced platelet Ca2+ elevation and procoagulant activity, and we monitored the consequences for the coagulation process. Even at high thrombin concentration, autocrine and added ADP enhanced and prolonged Ca2+ depletion from internal stores via stimulation of the P2Y(12) receptors. This P2Y(12)-dependent effect was mediated via two distinct signaling pathways. The first is enhanced Ca2+ mobilization by the inositol 1,4,5-trisphosphate receptors due to inhibition of protein kinase A. The second pathway concerns prolonged activation of phosphoinositide 3-kinase (PI3-K) and phospholipase C. Experiments with phosphoinositide 3-kinase isoform-selective inhibitors and p110 gamma deficient platelets demonstrated that the phosphoinositide 3-kinase beta and not the phosphoinositide 3-kinase gamma isoform is responsible for the prolonged Ca2+ response and for the subsequent increases in procoagulant activity and coagulation. Taken together, these results demonstrate a dual P2Y(12)-dependent signaling mechanism, which increases the platelet-activating effect of thrombin by prolongation of Ca2+ elevation, thereby facilitating the coagulation process.
机译:在血栓形成过程中,大量存在于血管损伤部位的凝血酶会部分通过自分泌产生的ADP激活血小板。我们调查了凝血酶和ADP在协同作用下诱导血小板Ca2 +升高和促凝血活性的信号传导途径,并监测了凝血过程的后果。即使在高凝血酶浓度下,自分泌和添加的ADP也会通过刺激P2Y(12)受体增强和延长内部存储中的Ca2 +消耗。这种P2Y(12)依赖效应是通过两个不同的信号传导途径介导的。第一个是由于蛋白激酶A的抑制,肌醇1,4,5-三磷酸受体增强了Ca2 +的动员。第二个途径涉及磷酸肌醇3-激酶(PI3-K)和磷脂酶C的延长活化。磷酸肌醇3-激酶同工型选择性抑制剂和p110γ缺陷型血小板证明,磷酸肌醇3激酶β而不是磷酸肌醇3激酶γ亚型是导致Ca2 +延长反应以及促凝活性和凝血功能随后增加的原因。综上所述,这些结果证明了双重的P2Y(12)依赖性信号传导机制,该机制通过延长Ca2 +升高来提高凝血酶的血小板活化作用,从而促进凝血过程。

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