Blood:酸性鞘磷脂酶在LPS和细胞因子诱导组织因子促凝活性中的作用

2019-07-04 MedSci MedSci原创

组织因子(TF)是VIIa因子的辅因子,是凝血的主要细胞诱发因子。通常情况下,细胞表面的TF大多以一种神秘的、凝血不活跃状态存在,但在细胞活化后会转化为促凝状态(解码/解密)。

中心点:

在体内,LPS诱导的单核细胞TF促凝活性依赖于IPS诱导的酸性鞘磷脂酶(ASMase)的激活。

ASMase抑制剂可在不影响TF蛋白合成的情况下减弱LPS-和细胞因子-诱导的TF促凝活性。

摘要:

组织因子(TF)是VIIa因子的辅因子,是凝血的主要细胞诱发因子。通常情况下,细胞表面的TF大多以一种神秘的、凝血不活跃状态存在,但在细胞活化后会转化为促凝状态(解码/解密)。

近期,Jue Wang等人通过细胞模型系统发现,在静息细胞中,细胞质膜外小叶中的鞘磷脂(SM)负责维持TF处于加密状态,SM水解则导致TF解密。

Jue Wang等人进一步对这一新机制在病理生理状态下调控TF促凝活性的相关性进行研究。结果发现,与在细胞系统中观察到的一样,给予小鼠ATP,可增强单核细胞LPS诱导的TF促凝活性。用药物(去甲丙咪嗪和丙咪嗪)抑制小鼠的ASMase,可缓解ATP诱导的TF解密。

有趣地是,ASMase抑制剂还可以在不影响LPS诱导的合成新的TF蛋白的情况下阻断LPS诱导的TF促凝活性。其他研究表明,LPS诱导ASMase向质膜外小叶转移,进而降低单核细胞的SM水平。人单核细胞来源的巨噬细胞和内皮细胞的研究也证实了ASMase在LPS-和细胞因子-诱导的TF促凝活性中的作用。

总体上,本研究表明LPS-和细胞因子-诱导的TF促凝活性需要通过ASMase介导水解SM来对新合成的TF蛋白解密。ASMase抑制剂能够减弱TF诱导的凝血这一发现增加了它们在治疗与TF异常表达相关的血栓性疾病中的应用潜能。

原始出处:

Jue Wang,et al.Acid sphingomyelinase plays a critical role in LPS- and cytokine-induced tissue factor procoagulant activity. Blood 2019 :blood.2019001400; doi: https://doi.org/10.1182/blood.2019001400

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    2019-07-25 kcb069
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    2019-07-04 百草

    666

    0

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