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Molecular Cancer
Published in: Molecular Cancer 1/2015

Open Access 01-12-2015 | Research

MicroRNA-31 controls G protein alpha-13 (GNA13) expression and cell invasion in breast cancer cells

Authors: Suhail Ahmed Kabeer Rasheed, Cui Rong Teo, Emmanuel Jean Beillard, P Mathijs Voorhoeve, Wei Zhou, Sujoy Ghosh, Patrick J Casey

Published in: Molecular Cancer | Issue 1/2015

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Abstract

Background

Gα13 (GNA13) is the α subunit of a heterotrimeric G protein that mediates signaling through specific G protein-coupled receptors (GPCRs). Our recent study showed that control of GNA13 expression by specific microRNAs (miRNAs or miRs) is important for prostate cancer cell invasion. However, little is known about the control of GNA13 expression in breast cancers. This project was carried out to determine (i) whether enhanced GNA13 expression is important for breast cancer cell invasion, and (ii) if so, the mechanism of deregulation of GNA13 expression in breast cancers.

Methods

To determine the probable miRNAs regulating GNA13, online miRNA target prediction tool Targetscan and Luciferase assays with GNA13-3′-UTR were used. Effect of miRNAs on GNA13 mRNA, protein and invasion was studied using RT-PCR, western blotting and in vitro Boyden chamber assay respectively. Cell proliferation was done using MTT assays.

Results

Overexpression of GNA13 in MCF-10a cells induced invasion, whereas knockdown of GNA13 expression in MDA-MB-231 cells inhibited invasion. Expression analysis of miRNAs predicted to bind the 3′-UTR of GNA13 revealed that miR-31 exhibited an inverse correlation to GNA13 protein expression in breast cancer cells. Ectopic expression of miR-31 in MDA-MB-231 cells significantly reduced GNA13 mRNA and protein levels, as well as GNA13-3′-UTR-reporter activity. Conversely, blocking miR-31 activity in MCF-10a cells induced GNA13 mRNA, protein and 3′-UTR reporter activity. Further, expression of miR-31 significantly inhibited MDA-MB-231 cell invasion, and this effect was partly rescued by ectopic expression of GNA13 in these cells. Examination of 48 human breast cancer tissues revealed that GNA13 mRNA levels were inversely correlated to miR-31 levels.

Conclusions

These data provide strong evidence that GNA13 expression in breast cancer cells is regulated by post-transcriptional mechanisms involving miR-31. Additionally our data shows that miR-31 regulates breast cancer cell invasion partially via targeting GNA13 expression in breast cancer cells. Loss of miR-31 expression and increased GNA13 expression could be used as biomarkers of breast cancer progression.
Appendix
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Metadata
Title
MicroRNA-31 controls G protein alpha-13 (GNA13) expression and cell invasion in breast cancer cells
Authors
Suhail Ahmed Kabeer Rasheed
Cui Rong Teo
Emmanuel Jean Beillard
P Mathijs Voorhoeve
Wei Zhou
Sujoy Ghosh
Patrick J Casey
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2015
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/s12943-015-0337-x

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