Open AccessMicroRNA-142-3p Negatively Regulates Canonical Wnt Signaling Pathway
Author(s) -
Tanyu Hu,
Krung Phiwpan,
James C. Y. Guo,
Wei Zhang,
Jie Guo,
Zhongmei Zhang,
Mangge Zou,
Xuejie Zhang,
Jianhua Zhang,
X. Y. Zhou
Publication year - 2016
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0158432
Subject(s) - wnt signaling pathway , microrna , adenomatous polyposis coli , lrp6 , microbiology and biotechnology , biology , signal transduction , downregulation and upregulation , axin2 , catenin , lrp5 , dkk1 , untranslated region , genetics , messenger rna , gene , colorectal cancer , cancer
Wnt/β-catenin signaling pathway plays essential roles in mammalian development and tissue homeostasis. MicroRNAs (miRNAs) are a class of regulators involved in modulating this pathway. In this study, we screened miRNAs regulating Wnt/β-catenin signaling by using a TopFlash based luciferase reporter. Surprisingly, we found that miR-142 inhibited Wnt/β-catenin signaling, which was inconsistent with a recent study showing that miR-142-3p targeted Adenomatous Polyposis Coli (APC) to upregulate Wnt/β-catenin signaling. Due to the discordance, we elaborated experiments by using extensive mutagenesis, which demonstrated that the stem-loop structure was important for miR-142 to efficiently suppress Wnt/β-catenin signaling. Moreover, the inhibitory effect of miR-142 relies on miR-142-3p rather than miR-142-5p. Further, we found that miR-142-3p directly modulated translation of Ctnnb1 mRNA (encoding β-catenin) through binding to its 3’ untranslated region (3’ UTR). Finally, miR-142 was able to repress cell cycle progression by inhibiting active Wnt/β-catenin signaling. Thus, our findings highlight the inhibitory role of miR-142-3p in Wnt/β-catenin signaling, which help to understand the complex regulation of Wnt/β-catenin signaling.