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Blood:miR-125a-5p通过肌动蛋白结合蛋白L-Plastin调节血小板前体的形成

2020-07-17 MedSci原创 MedSci原创

巨核细胞miR-125a-5p通过靶向肌动蛋白结合蛋白L-plastin正向调节血小板前体的形成和血小板数量。L-plastin调节巨核细胞迁移、血小板分支、足突形成和内陷膜系统发育。

个体间血小板计数存在遗传变异,更好理解其调控遗传因素或可解析血小板的生成过程。MicroRNAs (miRs)参与调控正常情况和多种疾病的基因表达,miRs缺乏的巨核细胞(MKs)和血小板计数较低,但是关于miRs在正常人MK和血小板生成中的作用尚不明确。

通过全基因组miR谱分析,Bhatlekar等观察到人骨髓MK、血小板和分化的脐带血来源的MK培养物之间存在很强的相关性,并明确MK的miR-125a-5p与人的血小板数量有关,但与白细胞或血红蛋白水平无关。

过表达和敲低试验显示,在体外,miR-125a-5p可正性调控人MK血小板前体(PP)的形成。抑制体内的miR-125a-5p可降低小鼠血小板计数。

对MK和血小板的转录组进行分析发现,LCP1是miR-125a-5p的靶点。LCP1编码肌动蛋白结合蛋白,L-plastin,既往未在MK中研究过。研究人员发现miR-125a-5p直接靶向并降低MK L-plastin的表达。

过表达和敲低试验显示,L-plastin可促进MK前体细胞迁移,但与人血小板计数负相关,L-plastin还可抑制MK PP形成。

本研究表明,miR-125a-5p与血小板计数密切相关,并首次证明了肌动蛋白结合蛋白L-plastin,是人MK PP形成的调节因子。miR-125a-5p和L-plastin可能是增加体外血小板生成及治疗血小板缺陷相关疾病的靶标。

原始出处:

Seema Bhatlekar,et al. miR-125a-5p Regulates Megakaryocyte Proplatelet Formation Via the Actin Bundling Protein L-Plastin. Blood. July 7,2020

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