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Analysis of the combined action of miR-143 and miR-145 on oncogenic pathways in colorectal cancer cells reveals a coordinate program of gene repression

Oncogene volume 32, pages 4806–4813 (2013)Cite this article

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Abstract

MicroRNAs (miRNAs) from the gene cluster miR-143–145 are diminished in cells of colorectal tumor origin when compared with normal colon epithelia. Until now, no report has addressed the coordinate action of these miRNAs in colorectal cancer (CRC). In this study, we performed a comprehensive molecular and functional analysis of the miRNA cluster regulatory network. First, we evaluated proliferation, migration, anchorage-independent growth and chemoresistance in the colon tumor cell lines after miR-143 and miR-145 restoration. Then, we assessed the contribution of single genes targeted by miR-143 and miR-145 by reinforcing their expression and checking functional recovery. Restoring miR-143 and miR-145 in colon cancer cells decreases proliferation, migration and chemoresistance. We identified cluster of differentiation 44 (CD44), Kruppel-like factor 5 (KLF5), Kirsten rat sarcoma 2 viral oncogene homolog (KRAS) and v-Raf murine sarcoma viral oncogene homolog B1 (BRAF) as proteins targeted by miR-143 and miR-145. Their re-expression can partially revert a decrease in transformation properties caused by the overexpression of miR-143 and miR-145. In addition, we determined a set of mRNAs that are diminished after reinforcing miR-143 and miR-145 expression. The whole transcriptome analysis ascertained that downregulated transcripts are enriched in predicted target genes in a statistically significant manner. A number of additional genes, whose expression decreases as a direct or indirect consequence of miR-143 and miR-145, reveals a complex regulatory network that affects cell signaling pathways involved in transformation. In conclusion, we identified a coordinated program of gene repression by miR-143 and miR-145, in CRC, where either of the two miRNAs share a target transcript, or where the target transcripts share a common signaling pathway. Major mediators of the oncosuppression by miR-143 and miR-145 are genes belonging to the growth factor receptor–mitogen-activated protein kinase network and to the p53 signaling pathway.

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Acknowledgements

This work was supported by grant from Associazione Italiana per la Ricerca sul Cancro, AIRC (Start-up 6326 to LR-V and Regional Fellowship to CV). We thank Tania Merlino for contribution in editing the manuscript.

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Authors and Affiliations

  1. Department of Hematology, Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy

    A Pagliuca, E Fabrizi, S di Martino, M Biffoni, D Runci & L Ricci-Vitiani

  2. Italian National Cancer Institute ‘Regina Elena’, Rome, Italy

    C Valvo, S di Martino & R De Maria

  3. IOM Ricerca Srl, Viagrande (CT), Italy

    S Forte

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  1. A Pagliuca
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Correspondence to A Pagliuca.

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Pagliuca, A., Valvo, C., Fabrizi, E. et al. Analysis of the combined action of miR-143 and miR-145 on oncogenic pathways in colorectal cancer cells reveals a coordinate program of gene repression. Oncogene 32, 4806–4813 (2013). https://doi.org/10.1038/onc.2012.495

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