Real-time functional imaging for monitoring miR-133 during myogenic differentiation.

Real-time functional imaging for monitoring miR-133 during myogenic differentiation.
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DOI:
10.1016/j.biocel.2009.04.018
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发表时间:
2009-11
影响因子:
4
通讯作者:
Asahara, Hiroshi
Asahara, Hiroshi
中科院分区:
生物学2区
文献类型:
--
作者:
Kato, Yoshio;Miyaki, Shigeru;Yokoyama, Shigetoshi;Omori, Shin;Inoue, Atsushi;Horiuchi, Machiko;Asahara, Hiroshi

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MicroRNA (miRNA) 是一类非编码小 RNA,通过与目标 mRNA 的 3' 非翻译区 (UTR) 进行序列特异性相互作用,充当基因表达的负调节因子,并发挥各种生物学作用。 miR-133 被鉴定为肌肉特异性 miRNA,可在肌原分化过程中增强成肌细胞的增殖,尽管其在肌发生中的活性尚未完全表征。在这里,我们开发了一种新型逆转录病毒载体系统,通过使用通过 UTR 连接到 miR-133 靶序列的绿色荧光蛋白 (GFP) 和用于标准化的红色荧光蛋白来监测活细胞中的肌肉特异性 miRNA。我们证明,通过携带 miR-133 靶序列的 GFP 的减少,可以观察到 miR-133 在肌生成过程中的功能促进,这表明 miR-133 在肌生成过程中根据其表达特异性下调其靶标。我们基于细胞的 miRNA 功能测定监测 miR-133 活性应该是阐明 miRNA 在各种生物事件中的作用的有用工具。
MicroRNAs (miRNAs) are a class of non-coding small RNAs that act as negative regulators of gene expression through sequence-specific interactions with the 3′ untranslated regions (UTRs) of target mRNA and play various biological roles. miR-133 was identified as a muscle-specific miRNA that enhanced the proliferation of myoblasts during myogenic differentiation, although its activity in myogenesis has not been fully characterized. Here, we developed a novel retroviral vector system for monitoring muscle-specific miRNA in living cells by using a green fluorescent protein (GFP) that is connected to the target sequence of miR-133 via the UTR and a red fluorescent protein for normalization. We demonstrated that the functional promotion of miR-133 during myogenesis is visualized by the reduction of GFP carrying the miR-133 target sequence, suggesting that miR-133 specifically down-regulates its targets during myogenesis in accordance with its expression. Our cell-based miRNA functional assay monitoring miR-133 activity should be a useful tool in elucidating the role of miRNAs in various biological events.
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