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Methylation-associated miR-193b silencing activates master drivers of aggressive prostate cancer.

Abstract：

:Epigenetic silencing of miRNA is a primary mechanism of aberrant miRNA expression in cancer, and hypermethylation of miRNA promoters has been reported to contribute to prostate cancer initiation and progression. Recent data have shown that the miR-193b promoter is hypermethylated in prostate cancer compared with normal tissue, but studies assessing its functional significance have not been performed. We aimed to elucidate the function of miR-193b and identify its critical targets in prostate cancer. We observed an inverse correlation between miR-193b level and methylation of its promoter in The Cancer Genome Atlas (TCGA) cohort. Overexpression of miR-193b in prostate cancer cell lines inhibited invasion and induced apoptosis. We found that a majority of the top 150 genes downregulated when miR-193b was overexpressed in liposarcoma are overexpressed in metastatic prostate cancer and that 41 miR-193b target genes overlapped with the 86 genes in the aggressive prostate cancer subtype 1 (PCS1) signature. Overexpression of miR-193b led to the inhibition of the majority of the 41 genes in prostate cancer cell lines. High expression of the 41 genes was correlated with recurrence of prostate cancer. Knockdown of miR-193b targets FOXM1 and RRM2 in prostate cancer cells phenocopied overexpression of miR-193b. Dual treatment with DNA methyltransferase (DNMT) and histone deacetylase (HDAC) inhibitors decreased miR-193b promoter methylation and restored inhibition of FOXM1 and RRM2. Our data suggest that silencing of miR-193b through promoter methylation may release the inhibition of PCS1 genes, contributing to prostate cancer progression and suggesting a possible therapeutic strategy for aggressive prostate cancer.

journal_name

Mol Oncol

journal_title

Molecular oncology

authors

Mazzu YZ,Yoshikawa Y,Nandakumar S,Chakraborty G,Armenia J,Jehane LE,Lee GM,Kantoff PW

doi

10.1002/1878-0261.12536

subject

Has Abstract

pub_date

2019-09-01 00:00:00

pages

1944-1958

issue

9

eissn

1574-7891

issn

1878-0261

journal_volume

13

pub_type

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