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Blood:T细胞缺陷是携带ARPC1B突变的联合型免疫缺陷患者的致病因素

2018-09-26 MedSci MedSci原创

中心点:ARPC1B缺陷可改变T细胞增殖、细胞骨架、细胞迁移和免疫突触组装。功能性缺陷在自然逆转和体外转导的T细胞中得到纠正。摘要:ARPC1B是组装和维护ARP2/3复合物的关键因子,而ARP2/3复合物参与肌动蛋白从现有的丝状体分支出来。近期在6位联合型免疫缺陷患者的生殖细胞中发现ARPC1B等位基因突变,其中性粒细胞和血小板均被研究过,但T淋巴细胞尚未被研究过。研究人员推测ARPC1B缺陷可

中心点:

ARPC1B缺陷可改变T细胞增殖、细胞骨架、细胞迁移和免疫突触组装。

功能性缺陷在自然逆转和体外转导的T细胞中得到纠正。

摘要:

ARPC1B是组装和维护ARP2/3复合物的关键因子,而ARP2/3复合物参与肌动蛋白从现有的丝状体分支出来。近期在6位联合型免疫缺陷患者的生殖细胞中发现ARPC1B等位基因突变,其中性粒细胞和血小板均被研究过,但T淋巴细胞尚未被研究过。研究人员推测ARPC1B缺陷可能也会导致T细胞细胞骨架和功能障碍。

研究人员在6个表现为严重感染、自身免疫混乱和血小板减少的不相关的早发型患者中检测到ARPC1B等位基因突变。免疫学特征包括T淋巴细胞减少症、幼稚T细胞数量少和IgE过高。通过流式细胞术和共聚焦显微镜观察发现ARPC1B蛋白结构改变导致表达量减少或缺失。该分子缺陷与患者来源的T细胞不能在TCR的刺激下扩展富含肌动蛋白的板状伪足和不能组装成免疫突触相关。

此外,ARPC1B缺陷型T细胞还表现出TCR介导的增殖和SDF1-α-导向的迁徙障碍。在体外,采用慢病毒载体向患者T细胞转染ARPC1B基因,可恢复ARPC1B的表达和T细胞增殖。

两位患者体细胞逆转恢复了其部分淋巴细胞的ARPC1B表达。一例逆转的患者的ARPC1B表达水平正常的CD8+记忆T细胞的迁移能力提高。遗传ARPC1B缺陷可改变T细胞的细胞骨架动力和功能,导致临床联合型免疫缺陷。

原始出处:

Immacolata Brigida, et al.T cell defects in patients with ARPC1B germline mutations account for their combined immunodeficiency. Blood  2018  :blood-2018-07-863431;  doi: https://doi.org/10.1182/blood-2018-07-863431

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