Synergism of platelet-aggregating agents. Role of elevation of cytoplasmic calcium.

Synergism of platelet-aggregating agents. Role of elevation of cytoplasmic calcium.
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血小板聚集剂的协同作用。

DOI:
10.1172/jci113058
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发表时间:
1987
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Salzman,EW
Salzman,EW
中科院分区:
--
文献类型:
--
作者:
Ware,JA;Smith,M;Salzman,EW

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当一对血小板激动剂,每一个在亚阈值浓度,一起或顺序加入到血小板悬浮液,血小板反应增强。如果两种激动剂在20 s内相互加入,则向装载有水母发光蛋白的血小板中加入两种激动剂也增强了所观察到的细胞质离子钙([Ca 2 +]i)响应于第二种激动剂的升高。聚集和分泌的增强需要在第一激动剂之后[Ca 2 +]i增加(如水母发光蛋白所示,但不一定是indo-1),但不需要[Ca 2 +]i保持升高直到添加第二激动剂。增强没有阻止阿司匹林,ADP清除剂,或螯合剂的细胞外Ca 2+。我们得出结论,第一种激动剂诱导的[Ca 2 +]i升高“引发”血小板对第二种激动剂的增强功能反应,然而,这并不是由加入第二种激动剂时的[Ca 2 +]i决定的。图片
When a pair of platelet agonists, each in subthreshold concentration, is added together or in sequence to a platelet suspension, the platelet response is enhanced. Addition of two agonists to platelets loaded with aequorin also enhanced the observed rise in cytoplasmic ionized calcium ([Ca2+]i) in response to the second agonist if the agonists were added within 20 s of each other. Enhancement of aggregation and secretion required that an increase in [Ca2+]i (as indicated by aequorin but not necessarily indo-1) followed the first agonist, but not that the [Ca2+]i remain elevated until addition of the second agonist. Enhancement was not prevented by aspirin, ADP scavengers, or chelators of extracellular Ca2+. We conclude that a rise in [Ca2+]i induced by a first agonist "primes" platelets for an augmented functional response to a second agonist, which is not, however, determined by the [Ca2+]i at the time of addition of the second agonist.Images
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DOI: 10.1016/0161-4630(80)90090-7
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