Journal
INTERNATIONAL JOURNAL OF CANCER
Volume 127, Issue 6, Pages 1363-1372Publisher
WILEY
DOI: 10.1002/ijc.25162
Keywords
prostatic carcinoma; neoplasia; CpG; methylation; miRNA
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Funding
- European Community [FP7/2007-2013, HEALTH-F2-2007-201438]
- Academy of Finland
- Cancer Society of Finland
- Reino Lahtikari Foundation
- Sigrid Juselius Foundation
- Pirkanmaa Hospital District
- Finnish Cultural Foundation
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miRNAs have proven to be key regulators of gene expression and are differentially expressed in various diseases, including cancer. Our aim was to identify epigenetically dysregulated genes in prostate cancer. We performed miRNA expression profiling after relieving epigenetic modifications in 6 prostate cancer cell lines and nonmalignant prostate epithelial cells. Thirty-eight miRNAs showed increased expression in any prostate cancer cell line after 5-aza-2 '-deoxycytidine (5azadC) and trichostatin A (TSA) treatments. Six of these also had decreased expression in clinical prostate cancer samples compared to benign prostatic hyperplasia. Among these, miR-193b was methylated in 22Rv1 cell line at a CpG island similar to 1 kb upstream of the miRNA locus. Expressing miR-193b in 22Rv1 cells using pre-miR-193b oligonucleotides caused a significant growth reduction (p < 0.001) resulting from a decrease of cells in S-phase of the cell cycle (p < 0.01). In addition, the anchorage independent growth was partially inhibited in transiently miR-193b-expressing 22Rv1 cells (p < 0.01). Altogether, our data suggest that miR-193b is an epigenetically silenced putative tumor suppressor in prostate cancer.
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