Abstract
Aberrant activation of the Wnt signaling pathway is causally involved in the formation of most colorectal cancers (CRCs). Although detailed knowledge exists regarding Wnt-regulated protein-coding genes, much less is known about the possible involvement of non-coding RNAs. Here we used TaqMan Array MicroRNA Cards, capable of detecting 664 unique human microRNAs (miRNAs), to describe changes of the miRNA transcriptome following disruption of beta-catenin/TCF4 activity in DLD1 CRC cells. Most miRNAs appeared to respond independent of host gene regulation and proximal TCF4 chromatin occupancy as inferred from expression microarray and ChIP–chip data. A module of miRNAs induced by abrogated Wnt signaling in vitro was downregulated in two independent series of human primary CRCs (n=76) relative to normal adjacent mucosa (n=34). Several of these miRNAs (miR-145, miR-126, miR-30e-3p and miR-139-5p) markedly inhibited CRC cell growth in vitro when ectopically expressed. By using an integrative approach of proteomics and expression microarrays, we found numerous mRNAs and proteins to be affected by ectopic miR-30e-3p levels. This included HELZ and PIK3C2A that were directly repressed by several miRNA binding sites as confirmed by luciferase reporter assays in combination with mutational analyses. Finally, small interfering RNA-mediated downregulation of PIK3C2A, but not HELZ, was sufficient on its own to restrict CRC cell growth. Collectively, our study demonstrates that multiple miRNAs are upregulated as a consequence of forced attenuation of Wnt signaling in CRC cells, and some of these miRNAs inhibit cell growth with concomitant suppression of several growth-stimulatory cancer-related genes.
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Acknowledgements
We thank Misti Martinez, Hanne Steen, Inge-Lis Thorsen and Pamela Celis for technical assistance. TOPflash/FOPflash plasmids were kindly provided by Philippe Blache, and the CLINT1 luciferase reporter plasmid was generously provided by Jesper B Bramsen. This work was supported by the Desirée and Niels Yde's Foundation, the John and Birthe Meyer Foundation, the Lundbeck Foundation, the Danish Council for Independent Research Medical Sciences, the Danish Council for Strategic Research, the Danish Agency for Science, Technology and Innovation, and the Danish Ministry of the Interior and Health.
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Schepeler, T., Holm, A., Halvey, P. et al. Attenuation of the beta-catenin/TCF4 complex in colorectal cancer cells induces several growth-suppressive microRNAs that target cancer promoting genes. Oncogene 31, 2750–2760 (2012). https://doi.org/10.1038/onc.2011.453
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DOI: https://doi.org/10.1038/onc.2011.453
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