Genomic loss of miR-486 regulates tumor progression and the OLFM4 antiapoptotic factor in gastric cancer

Hue Kian Oh, Angie Lay Keng Tan, Kakoli Das, Chia Huey Ooi, Nian Tao Deng, Iain Bee Huat Tan, Emmanuel Beillard, Julian Lee, Kalpana Ramnarayanan, Sun Young Rha, Nallasivam Palanisamy, P. Mathijs Voorhoeve, Patrick Tan

Research output: Contribution to journalArticle

150 Citations (Scopus)

Abstract

Purpose: MicroRNAs (miRNA) play pivotal oncogenic and tumor-suppressor roles in several human cancers. We sought to discover novel tumor-suppressor miRNAs in gastric cancer (GC). Experimental Design: Using Agilent miRNA microarrays, we compared miRNA expression profiles of 40 primary gastric tumors and 40 gastric normal tissues, identifying miRNAs significantly downregulated in gastric tumors. Results: Among the top 80 miRNAs differentially expressed between gastric tumors and normals (false discovery rate < 0.01), we identified hsa-miR-486 (miR-486) as a significantly downregulated miRNA in primary GCs and GC cell lines. Restoration of miR-486 expression in GC cell lines (YCC3, SCH and AGS) caused suppression of several pro-oncogenic traits, whereas conversely inhibiting miR-486 expression in YCC6 GC cells enhanced cellular proliferation. Array-CGH analysis of 106 primary GCs revealed genomic loss of the miR-486 locus in approximately 25% to 30% of GCs, including two tumors with focal genomic losses specifically deleting miR-486, consistent with miR-486 playing a tumor-suppressive role. Bioinformatic analysis identified the secreted antiapoptotic glycoprotein OLFM4 as a potential miR-486 target. Restoring miR-486 expression in GC cells decreased endogenous OLFM4 transcript and protein levels, and also inhibited expression of luciferase reporters containing an OLFM4 3′ untranslated region with predicted miR-486 binding sites. Supporting the biological relevance of OLFM4 as a miR-486 target, proliferation in GC cells was also significantly reduced by OLFM4 silencing. Conclusions: miR-486 may function as a novel tumor-suppressor miRNA in GC. Its antioncogenic activity may involve the direct targeting and inhibition of OLFM4.

Original languageEnglish
Pages (from-to)2657-2667
Number of pages11
JournalClinical Cancer Research
Volume17
Issue number9
DOIs
Publication statusPublished - 2011 May 1

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

Fingerprint Dive into the research topics of 'Genomic loss of miR-486 regulates tumor progression and the OLFM4 antiapoptotic factor in gastric cancer'. Together they form a unique fingerprint.

  • Cite this

    Oh, H. K., Tan, A. L. K., Das, K., Ooi, C. H., Deng, N. T., Tan, I. B. H., Beillard, E., Lee, J., Ramnarayanan, K., Rha, S. Y., Palanisamy, N., Voorhoeve, P. M., & Tan, P. (2011). Genomic loss of miR-486 regulates tumor progression and the OLFM4 antiapoptotic factor in gastric cancer. Clinical Cancer Research, 17(9), 2657-2667. https://doi.org/10.1158/1078-0432.CCR-10-3152