Tumor suppressive microRNA-137 negatively regulates Musashi-1 and colorectal cancer progression.

Tumor suppressive microRNA-137 negatively regulates Musashi-1 and colorectal cancer progression.
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DOI:
10.18632/oncotarget.3726
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发表时间:
2015-05-20
期刊:
影响因子:
--
通讯作者:
Xu L
Xu L
中科院分区:
其他
文献类型:
--
作者:
Smith AR;Marquez RT;Tsao WC;Pathak S;Roy A;Ping J;Wilkerson B;Lan L;Meng W;Neufeld KL;Sun XF;Xu L

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干细胞标志物 Musashi-1 (MSI1) 在许多癌症类型中过度表达;然而,MSI1 过度表达所涉及的分子机制尚不清楚。我们研究了 MSI1 的 microRNA (miRNA) 调控以及该调控在结直肠癌中的影响。通过免疫印迹和荧光素酶报告基因检测,MicroRNA miR-137 被鉴定为靶向 MSI1 的 microRNA。与配对的正常粘膜样本相比,MSI1 蛋白在 79% 的原发性直肠肿瘤组织 (n=146) 中高表达,而 miR-137 表达在 84% 的直肠肿瘤组织 (n=68) 中降低。除了减少 MSI1 蛋白外,miR-137 的外源表达还抑制结肠癌细胞的细胞生长、集落形成和肿瘤球生长。最后,体内研究表明,miR-137 的诱导可以减少人类结肠癌异种移植物的生长。我们的结果表明,miR-137 在结直肠癌中充当肿瘤抑制 miRNA,并负向调节致癌 MSI1。
Stem cell marker, Musashi-1 (MSI1) is over-expressed in many cancer types; however the molecular mechanisms involved in MSI1 over-expression are not well understood. We investigated the microRNA (miRNA) regulation of MSI1 and the implications this regulation plays in colorectal cancer. MicroRNA miR-137 was identified as a MSI1-targeting microRNA by immunoblotting and luciferase reporter assays. MSI1 protein was found to be highly expressed in 79% of primary rectal tumors (n=146), while miR-137 expression was decreased in 84% of the rectal tumor tissues (n=68) compared to paired normal mucosal samples. In addition to reduced MSI1 protein, exogenous expression of miR-137 inhibited cell growth, colony formation, and tumorsphere growth of colon cancer cells. Finally, in vivo studies demonstrated that induction of miR-137 can decrease growth of human colon cancer xenografts. Our results demonstrate that miR-137 acts as a tumor-suppressive miRNA in colorectal cancers and negatively regulates oncogenic MSI1.
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