MiR-15b and miR-322 inhibit SETD3 expression to repress muscle cell differentiation

MiR-15b and miR-322 inhibit SETD3 expression to repress muscle cell differentiation
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miR-15b 和 miR-322 抑制 SETD3 表达以抑制肌细胞分化

DOI:
10.1038/s41419-019-1432-5
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发表时间:
2019-02
期刊:
Cell Death & Diseases
影响因子:
--
通讯作者:
Du Hai-Ning
Du Hai-Ning
中科院分区:
其他
文献类型:
--
作者:
Zhao Meng-Jie;Xie Jun;Shu Wen-Jie;Wang Hong-Yan;Bi Jianping;Jiang Wei;Du Hai-Ning

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SETD 3是SET结构域甲基转移酶家族的成员,在多种生物学事件中起着关键作用。研究表明,在C2 C12细胞分化过程中,SETD 3可以调控成肌调节基因的转录,促进成肌细胞的分化。然而,在成肌细胞分化过程中如何调节SETD 3仍然是未知的。在这里,我们报告了两种重要的microRNAs(miRNAs)可以抑制SETD 3,并对成肌细胞分化产生负面影响。利用microRNA(miRNA)预测引擎,我们鉴定并鉴定了miR-15 b和miR-322是通过直接靶向SETD 3基因3 '非翻译区抑制SETD 3表达的主要miRNA。在功能上,miR-15 b或miR-322的过表达导致内源性SETD 3表达的阻遏和成肌细胞分化的抑制,而miR-15 b或miR-322的抑制解除内源性SETD 3表达的阻遏并促进成肌细胞分化。此外,在miR-15 b或miR-322抑制的成肌细胞中敲低SETD 3能够拯救易化分化表型。更有趣的是,我们发现,在肌肉细胞分化过程中,转录因子E2 F1或FAM 3B分别正向或负向调节miR-15 b或miR-322的表达,这反过来又影响SETD 3的表达。因此,我们的研究结果建立了两个平行的级联调节途径,其中转录因子调节microRNA的命运,从而控制SETD 3表达并最终决定骨骼肌分化。
SETD3 is a member of SET-domain containing methyltransferase family, which plays critical roles in various biological events. It has been shown that SETD3 could regulate the transcription of myogenic regulatory genes in C2C12 differentiation and promote myoblast determination. However, how SETD3 is regulated during myoblast differentiation is still unknown. Here, we report that two important microRNAs (miRNAs) could repress SETD3 and negatively contribute to myoblast differentiation. Using microRNA (miRNA) prediction engines, we identify and characterize miR-15b and miR-322 as the primary miRNAs that repress the expression of SETD3 through directly targeting the 3’-untranslated region of SETD3 gene. Functionally, overexpression of miR-15b or miR-322 leads to the repression of endogenous SETD3 expression and the inhibition of myoblast differentiation, whereas inhibition of miR-15b or miR-322 derepresses endogenous SETD3 expression and facilitates myoblast differentiation. In addition, knockdown SETD3 in miR-15b or miR-322 repressed myoblasts is able to rescue the facilitated differentiation phenotype. More interestingly, we revealed that transcription factor E2F1 or FAM3B positively or negatively regulates miR-15b or miR-322 expression, respectively, during muscle cell differentiation, which in turn affects SETD3 expression. Therefore, our results establish two parallel cascade regulatory pathways, in which transcription factors regulate microRNAs fates, thereby controlling SETD3 expression and eventually determining skeletal muscle differentiation.
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