Blood:血小板坏死介导缺血性卒中脑损伤!

2019-12-07 QQY MedSci原创

血小板功能失调导致缺血性脑卒中的发生和发展。通过血小板特异性缺失环亲素D(CypD)的小鼠,Denorme等人发现血小板坏死可调节体内组织损伤和缺血性卒中的预后。血小板缺失CypD(CypDplt-/-)可明显增加小鼠脑缺血-再灌注损伤后的脑血流量、改善神经功能和运动功能、减少缺血性脑梗死体积。这些效应至少部分可归因于血小板与中性粒细胞的相互作用。卒中24小时后,CypDplt+/+小鼠的循环血小

中心点:

环亲素D调控的血小板坏死介导血小板与中性粒细胞的相互作用,进而加重缺血性卒中负担。

靶向环亲素D介导的血小板坏死可改善卒中预后

摘要:

血小板功能失调导致缺血性脑卒中的发生和发展。通过血小板特异性缺失环亲素D(CypD)的小鼠,Denorme等人发现血小板坏死可调节体内组织损伤和缺血性卒中的预后。血小板缺失CypD(CypDplt-/-)可明显增加小鼠脑缺血-再灌注损伤后的脑血流量、改善神经功能和运动功能、减少缺血性脑梗死体积。这些效应至少部分可归因于血小板与中性粒细胞的相互作用。卒中24小时后,CypDplt+/+小鼠的循环血小板中性粒细胞聚集物(PNAs)明显增多。

为了进一步解析血小板坏死在PNA形成中的作用,研究人员在CypDplt+/+小鼠中观察到PNA中存在大量的磷脂酰丝氨酸阳性(PS+)血小板。相反,在配对的CypDplt-/-小鼠中,发现PNAs中的PS+血小板明显减少。

因此,CypD缺陷型血小板的小鼠在卒中后招募到其大脑的中性粒细胞和PNAs较野生型小鼠的明显减少。耗竭野生型小鼠的中性粒细胞对缺血性卒中的保护作用与血小板CypD缺陷小鼠的相似。耗竭CypDplt-/-小鼠的中性粒细胞不会进一步减少梗死面积。对体外形成的PNAs进行透射电镜发现,坏死的血小板有与中性粒细胞相互作用的倾向。

综上所述,本研究表明坏死性血小板与中性粒细胞相互作用,恶化缺血性卒中后的脑损伤。鉴于抑制血小板坏死并不影响止血,因此靶向血小板CypD可能是限制缺血性脑卒中后脑损伤的一种潜在治疗策略。

原始出处:

Frederik Denorme, et al.Platelet necrosis mediates ischemic stroke outcome in mice.Blood. December 04, 2019.

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    2019-12-09 millore
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    2019-12-07 健健

    卒中虽然是临床上常见病,溶栓,取栓等血管内治疗也很成熟,但是仍然有很多未知问题有待认知!

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