miR-544a induces epithelial-mesenchymal transition through the activation of WNT signaling pathway in gastric cancer

被引:88
作者
Yanaka, Yoshimitsu [1 ,2 ]
Muramatsu, Tomoki [1 ]
Uetake, Hiroyuki [2 ]
Kozaki, Ken-ichi [1 ,3 ,4 ]
Inazawa, Johji [1 ,3 ,5 ]
机构
[1] Tokyo Med & Dent Univ, Grad Sch, Dept Mol Cytogenet, Med Res Inst,Bunkyo Ku, Tokyo 1138510, Japan
[2] Tokyo Med & Dent Univ, Grad Sch, Dept Surg Oncol, Bunkyo Ku, Tokyo 1138510, Japan
[3] Tokyo Med & Dent Univ, Grad Sch, Bioresource Res Ctr, Bunkyo Ku, Tokyo 1138510, Japan
[4] Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Dept Dent Pharmacol, Okayama 7008525, Japan
[5] Tokyo Med & Dent Univ, Grad Sch, Hard Tissue Genome Res Ctr, Tokyo 1138510, Japan
关键词
DNA HYPERMETHYLATION; ORAL-CANCER; MICRORNA; CELLS; TRANSCRIPTION;
D O I
10.1093/carcin/bgv106
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
The epithelial-mesenchymal transition (EMT) contributes to cancer progression, as well as the development of normal organs, wound healing and organ fibrosis. We established a cell-based reporter system for identifying EMT-inducing microRNAs (miRNAs) with a gastric cancer (GC) cell line, MKN1, transfected with a reporter construct containing a promoter sequence of VIM in the 5' upstream region of the TurboRFP reporter gene. Function-based screening using this reporter system was performed with a 328-miRNA library, and resulted in the identification miR-544a as an EMT-inducing miRNA. Although miR-544a is already known to be involved in the regulation of CDH1, the mechanism by which EMT occurs remains poorly understood. Herein, we demonstrated that overexpression of miR-544a induces VIM, SNAI1 and ZEB1 expression, and reduces CDH1 expression, resulting in an EMT phenotype. In addition, we found that CDH1 and AXIN2, which are related to the degradation and the translocation of a-catenin, are direct targets of miR-544a. Subsequently, the reduction of CDH1 and AXIN2 by miR-544a induced the nuclear import of a-catenin, suggesting that miR-544a may activate the WNT signaling pathway through the stabilization of a-catenin in nucleus. Our findings raise the possibility that inhibition of miR-544a may be a therapeutic target of metastatic GC.
引用
收藏
页码:1363 / 1371
页数:9
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