A potent 2'-O-methylated RNA-based microRNA inhibitor with unique secondary structures.

A potent 2'-O-methylated RNA-based microRNA inhibitor with unique secondary structures.
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DOI:
10.1093/nar/gkr1317
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发表时间:
2012-04
影响因子:
14.9
通讯作者:
Iba H
Iba H
中科院分区:
生物学2区
文献类型:
--
作者:
Haraguchi T;Nakano H;Tagawa T;Ohki T;Ueno Y;Yoshida T;Iba H

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microRNAs(miRNAs)参与多种生物学过程和人类疾病。因此,开发特异性miRNA的强低分子量抑制剂有望为基础研究提供工具或产生有前途的新治疗药物。我们之前已经描述了“坚韧诱饵(TuD)RNA”分子的开发,当从慢病毒载体表达时,其实现了哺乳动物细胞中特异性miRNA活性的长期抑制。在我们目前的研究中,我们描述了新的合成miRNA抑制剂,命名为S-TuD(合成TuD),它由两个完全2′-O-甲基化的RNA链组成。这些链中的每一条都包括miRNA结合位点。在成对链杂交后,所得的S-TuD形成具有两个茎的二级结构,其类似于相应的TuD RNA分子。通过分析S-TuD对miR-21、miR-200 c、miR-16和miR-106 b的作用,我们阐明了S-TuD分子的关键设计特征,这些特征将在转染到人细胞系中后提供最佳抑制作用。我们进一步表明,S-TuD-miR 200 c的单次转染的抑制作用是相当持久的(>7天),并诱导部分EMT,当使用连续表达TuD-miR 200 c的慢病毒载体时,其完全建立需要11天。
MicroRNAs (miRNAs) are involved in various biological processes and human diseases. The development of strong low-molecular weight inhibitors of specific miRNAs is thus expected to be useful in providing tools for basic research or in generating promising new therapeutic drugs. We have previously described the development of ‘Tough Decoy (TuD) RNA’ molecules, which achieve the long-term suppression of specific miRNA activity in mammalian cells when expressed from a lentivirus vector. In our current study, we describe new synthetic miRNA inhibitors, designated as S-TuD (Synthetic TuD), which are composed of two fully 2′-O-methylated RNA strands. Each of these strands includes a miRNA-binding site. Following the hybridization of paired strands, the resultant S-TuD forms a secondary structure with two stems, which resembles the corresponding TuD RNA molecule. By analyzing the effects of S-TuD against miR-21, miR-200c, miR-16 and miR-106b, we have elucidated the critical design features of S-TuD molecules that will provide optimum inhibitory effects following transfection into human cell lines. We further show that the inhibitory effects of a single transfection of S-TuD-miR200c are quite long-lasting (>7 days) and induce partial EMT, the full establishment of which requires 11 days when using a lentivirus vector that expresses TuD-miR200c continuously.
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