Regulation of ITGA3 by the dual-stranded microRNA-199 family as a potential prognostic marker in bladder cancer.

Abstract:

BACKGROUND:Based on the microRNA (miRNA) signature of bladder cancer (BC) by deep sequencing, we recently found that several double-stranded mature miRNAs derived from the same pre-miRNAs were sufficiently expressed and acted as tumour suppressors by regulating common target genes in BC. Our deep-sequencing signature of BC showed that all miR-199 family members (miR-199a-3p/-5p and miR-199b-3p/-5p) were also downregulated. We hypothesised that these miRNAs may function as tumour suppressors by regulating common target genes. METHODS:Functional assays of BC cells were performed using transfection of mature miRNA. In silico analyses and luciferase reporter analyses were applied to identify target genes of these miRNAs. The overall survival of patients with BC in The Cancer Genome Atlas (TCGA) database was evaluated by the Kaplan-Meier method. RESULTS:Restoration of these miRNAs significantly inhibited cell migration and invasion in BC cells. Integrin α3 (ITGA3) was directly regulated by these miRNAs. The Cancer Genome Atlas database showed that patients with low pre-miR-199 family (miR-199a-1/-2 and miR-199b) expression exhibited significantly poorer overall survival compared with patients with high pre-miR-199 family expression. CONCLUSIONS:miR-199 family miRNAs functioned as tumour suppressors in BC cells by targeting ITGA3 and might be good prognostic markers for predicting survival in patients with BC.

journal_name

Br J Cancer

authors

Sakaguchi T,Yoshino H,Yonemori M,Miyamoto K,Sugita S,Matsushita R,Itesako T,Tatarano S,Nakagawa M,Enokida H

doi

10.1038/bjc.2017.43

subject

Has Abstract

pub_date

2017-04-11 00:00:00

pages

1077-1087

issue

8

eissn

0007-0920

issn

1532-1827

pii

bjc201743

journal_volume

116

pub_type

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