Blood:FcγRIIA表达加重狼疮肾炎、促进血小板活化

2021-01-05 Nebula MedSci原创

系统性红斑狼疮(SLE)是一种自身免疫性炎症性疾病,其特征是免疫复合物(IC)在器官和组织中沉积。FcγRIIA是免疫球蛋白G抗体的特异性受体,在人血小板中表达;FcγRIIA

系统性红斑狼疮(SLE)是一种自身免疫性炎症性疾病,其特征是免疫复合物(IC)在器官和组织中沉积。FcγRIIA是免疫球蛋白G抗体的特异性受体,在人血小板中表达;FcγRIIA的表达可使血小板对循环中的IC做出理想的反应。

虽然慢性血小板活化和血栓形成是公认的人SLE的特征,但血小板活化在SLE中的确切机制仍不清楚。在本研究中,Imene等评估了FcγRIIA在SLE和血小板活化过程中的作用。

表达人FcγRIIA的SLE小鼠模型

在SLE患者中,IC水平与血小板活化有关。由于FcγRIIA基因在小鼠体内缺失,且在现有的任何狼疮小鼠模型中,小鼠血小板对IC均无反应,研究人员将FcγRIIA(FCGR2A)基因导入了NZB/NZWF1红斑狼疮小鼠模型中。

IC-FcγRIIA介导人SLE的血小板激活

在新建立的小鼠模型中,骨髓细胞表达FcγRIIA可明显加重狼疮性肾炎,加速小鼠死亡。狼疮发作可引起血小板转录组发生明显改变,无论是表达还是不表达FcγRIIA的小鼠,但在FcγRIIA小鼠中特异性地观察到I型干扰素反应基因发生富集变化。此外,在表达FcγRIIA的狼疮小鼠中,观察到循环血小板脱颗粒,并与中性粒细胞相互作用。狼疮小鼠的FcγRIIA表达也可导致肺和肾脏血栓形成。

总之,该模型概括了人SLE的特征,可用于识别不同细胞系在SLE表现中的作用。该研究进一步揭示了FcγRIIA在肾炎和SLE血小板活化中的作用。

原始出处:

Melki Imene,Allaeys Isabelle,Tessandier Nicolas et al. FcγRIIA expression accelerates nephritis and increases platelet activation in systemic lupus erythematosus. Blood, 2020, 136: 2933-2945.

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    2021-04-30 MedSciZeng

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    2021-01-28 ms6000000683288641

    医学

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    2021-01-07 villahu

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