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Small molecular weight heat shock-related protein, HSP20, exhibits an anti-platelet activity by inhibiting receptor-mediated calcium influx.

机译:小分子热休克相关蛋白HSP20通过抑制受体介导的钙内流表现出抗血小板活性。

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We have shown that Hsp20, one of small molecular weight heat shock protein, which is present at a high concentration both in vascular smooth muscle cells and in circulating blood in patient with vascular disease, strongly inhibits platelet aggregation in vitro and ex vivo. To clarify the mechanism, we investigated the effect of Hsp20 on free calcium concentration in human platelet cytoplasm using fura 2. Hsp20 inhibited thrombin-induced calcium influx without affecting calcium release from intracellular calcium stores. The degree of inhibition is well-correlated with that of suppression of thrombin-induced platelet aggregation by this substance. Hsp20 also inhibited the elevation of cytoplasmic free calcium level triggered by collagen, but not that by A-23187. In contrast, Hsp28, another type of small molecular weight Hsp, failed to affect the cytoplasmic free calcium level. These findings suggest that Hsp20 inhibits the receptor-mediated calcium influx of platelets without affecting calcium release from intracellular calcium stores, leading to its anti-platelet activity.
机译:我们已经证明,Hsp20是一种小分子热休克蛋白,在血管疾病患者的血管平滑肌细胞和循环血液中均以高浓度存在,它在体外和离体细胞中均强烈抑制血小板聚集。为了阐明机理,我们使用呋喃2研究了Hsp20对人血小板细胞质中游离钙浓度的影响。Hsp20抑制了凝血酶诱导的钙内流,而没有影响细胞内钙库中钙的释放。抑制程度与该物质抑制凝血酶诱导的血小板凝集程度密切相关。 Hsp20还抑制胶原蛋白触发的细胞质游离钙水平升高,但不抑制A-23187。相反,另一种小分子Hsp Hsp28不能影响细胞质游离钙水平。这些发现表明,Hsp20抑制了血小板介导的钙受体内流而不影响钙从细胞内钙存储中的释放,从而导致其抗血小板活性。

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