Blood:MKL1缺陷型重度免疫功能障碍!

2020-03-05 不详 MedSci原创

中心点:MKL1缺陷中性粒细胞因肌动蛋白聚合障碍和肌动蛋白相关蛋白下调表现出严重的功能障碍。MKL1缺陷不影响原代成纤维细胞的形态、丝状肌动蛋白的含量和迁移行为。摘要:巨幼细胞白血病1 (MKL1)通过联合激活血清反应因子促进基本细胞过程的调节,包括肌动蛋白细胞骨架动力学。近期,发现了导致一种新的原发性免疫缺陷的首例MKL1缺陷人类患者。Sprenkeler等人报道了第二个家庭,兄弟俩均携带MKL

中心点:

MKL1缺陷中性粒细胞因肌动蛋白聚合障碍和肌动蛋白相关蛋白下调表现出严重的功能障碍。

MKL1缺陷不影响原代成纤维细胞的形态、丝状肌动蛋白的含量和迁移行为。

摘要:

巨幼细胞白血病1 (MKL1)通过联合激活血清反应因子促进基本细胞过程的调节,包括肌动蛋白细胞骨架动力学。近期,发现了导致一种新的原发性免疫缺陷的首例MKL1缺陷人类患者。

Sprenkeler等人报道了第二个家庭,兄弟俩均携带MKL1基因纯合移码变异。哥哥在婴儿时死于进行性重症肺炎合并铜绿假单胞菌感染和创面愈合不良。弟弟在出生后不久就预先进行了移植。

免疫缺陷表现为明显的肌动蛋白聚合缺陷、MKL1缺陷中性粒细胞对运动和趋化反应的明显减弱。

除了缺乏MKL1外,研究人员对患者中性粒细胞的蛋白质组学和转录组学分析发现,肌动蛋白和几个与肌动蛋白相关蛋白下调,证实了MKL1作为转录协同调节因子的作用。

次优中性粒细胞激活时脱颗粒作用增强,活性氧生成正常。中性粒细胞黏附正常,但未见适当扩散。后者可以解释在流动条件下观察到的黏附和跨内皮迁移失败。未观察到明显的吞噬和细菌杀灭障碍。单核细胞来源的巨噬细胞也表现出正常的吞噬作用;淋巴细胞计数和增殖能力正常。

非造血原代患者成纤维细胞表现出肌成纤维细胞分化障碍,但其迁移和丝样肌动蛋白(F-actin)含量正常,这可能与MKL2的代偿机制有关,而MKL2在中性粒细胞中不表达。

本研究发现扩展了目前对以细胞骨架功能障碍和中性粒细胞外渗障碍为最突出特征的MKL1缺陷型重度免疫功能障碍的认识。

原始出处:


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    2020-03-27 yangjxjc
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