MiR-124 suppresses growth of human colorectal cancer by inhibiting STAT3.

MiR-124 suppresses growth of human colorectal cancer by inhibiting STAT3.
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MiR-124 通过抑制 STAT3 抑制人结直肠癌的生长

DOI:
10.1371/journal.pone.0070300
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Wan J
Wan J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhang J;Lu Y;Yue X;Li H;Luo X;Wang Y;Wang K;Wan J

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新的证据表明 microRNA (miRNA) 可能在癌症中发挥重要作用。 miRNA 的异常表达经常在不同的人类恶性肿瘤中被发现,包括结直肠癌 (CRC)。然而,解除管制的 miRNA 影响 CRC 发展的机制仍然很大程度上难以捉摸。在这项研究中,我们发现与邻近的非肿瘤结直肠组织相比,miR-124 在 CRC 中显着下调。 MiR-124 通过直接结合 STAT3 的 3'-非翻译区 (3'-UTR) 来抑制 STAT3 的表达。 miR-124 的过度表达导致 CRC 细胞凋亡增加,并在体外和体内减少肿瘤生长。通过特异性 siRNA 敲低 STAT3 表达,可在体外和体内抑制 CRC 细胞的生长,类似于 miR-124 过表达。此外,转染miR-124的CRC细胞中STAT3的过表达有效地挽救了miR-124引起的细胞增殖抑制。这些数据表明 miR-124 通过靶向 STAT3 作为肿瘤抑制因子,并呼吁使用 miR-124 作为 CRC 的潜在治疗工具,其中 STAT3 经常被过度激活。
Emerging evidence indicate that microRNAs (miRNAs) may play important roles in cancer. Aberrant expression of miRNAs has been frequently identified in different human malignancies, including colorectal cancer (CRC). However, the mechanism by which deregulated miRNAs impact the development of CRC remains largely elusive. In this study, we show that miR-124 is significantly down-regulated in CRC compared to adjacent non-tumor colorectal tissues. MiR-124 suppresses the expression of STAT3 by directly binding to its 3′-untranslated region (3′-UTR). Overexpression of miR-124 led to increased apoptosis of CRC cells and reduced tumor growth in vitro and in vivo. Knocking down STAT3 expression by specific siRNA suppressed the growth of CRC cells in vitro and in vivo, resembling that of miR-124 overexpression. Moreover, overexpression of STAT3 in miR-124-transfected CRC cells effectively rescued the inhibition of cell proliferation caused by miR-124. These data suggest that miR-124 serves as a tumor suppressor by targeting STAT3, and call for the use of miR-124 as a potential therapeutic tool for CRC, where STAT3 is often hyper-activated.
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