Blood:miR-144/451通过调控Cox10的表达抑制线粒体呼吸

2019-04-13 MedSci MedSci原创

中心点:miR-144/451只抑制小鼠有核红细胞中一小部分的结合mRNAs。在红细胞生成过程中,miR-451可抑制线粒体呼吸。摘要:miR-144/451在红细胞前体中大量表达,促进其终末成熟,保护机体免受氧化应激。但是红细胞miR-144/451的靶mRNAs谱和相关的细胞信号通路尚不明确。一般来说,miRNA的预测靶mRNA的数量在数百到数千不等,与实验方法相关。为全面、准确地识别红系细胞

中心点:

miR-144/451只抑制小鼠有核红细胞中一小部分的结合mRNAs。

在红细胞生成过程中,miR-451可抑制线粒体呼吸。

摘要:

miR-144/451在红细胞前体中大量表达,促进其终末成熟,保护机体免受氧化应激。但是红细胞miR-144/451的靶mRNAs谱和相关的细胞信号通路尚不明确。一般来说,miRNA的预测靶mRNA的数量在数百到数千不等,与实验方法相关。

为全面、准确地识别红系细胞miR-144/451的靶mRNAs,研究人员通过RNA测序、定量蛋白质组学和Argonaute (Ago,RNA诱导沉默复合体[RISC]的组成成分,可结合miRNAs附合到靶mRNAs上)的RNA免疫沉淀技术对基因敲除(KO)和野生型的胎儿肝红细胞进行对比。

通过miR-144/451依赖性方式,Argonaute大约可结合1400个红系细胞mRNAs,约占Ago结合mRNAs的三分之一。但miR-144/451缺失后,仅约100个mRNAs是稳定的。因此,miR-144和miR-451可解除大约10%的它们结合的mRNAs的调控,这一特征可能普遍适用于其他miRNA。

采用严格的选择标准,最终确定了53个miR-144/451的新靶mRNAs。其中,Cox10可促进线粒体电子转运复合物IV的组装。缺失miR-144/451可增加Cox10的mRNA和蛋白水平、促进复合物IV积累并可增强线粒体膜电位,且不改变线粒体质量。

总而言之,在红细胞生成过程中,miR-144/451可通过抑制Cox10的合成来抑制线粒体呼吸。

原始出处:

Peng Xu, et al. Regulation of gene expression by miR-144/451 during mouse erythropoiesis. Blood 2019 :blood.2018854604; doi: https://doi.org/10.1182/blood.2018854604 

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    2020-01-17 smallant2002
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    2019-12-20 俅侠