miR-532-5p promotes breast cancer proliferation and migration by targeting RERG

Aberrant expression of microRNAs (miRNAs/miRs) mediates the initiation and progression of breast cancer. Therefore, it is important to investigate the molecular mechanisms of miRNAs and their effects on breast cancer progression. In the present study, miR-532-5p was highly expressed in breast cancer...

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Bibliographic Details
Published in:Experimental and therapeutic medicine 2020-01, Vol.19 (1), p.400-408
Main Authors: Huang, Lei, Tang, Xiaoqiao, Shi, Xianbiao, Su, Lei
Format: Article
Language:English
Subjects:
Analysis
Binding sites
Biotechnology industries
Breast cancer
Cancer cells
Cancer research
Cancer therapies
Cell adhesion & migration
Cell growth
Estrogens
Experiments
Genes
Immunoglobulins
Kinases
Luciferase
Messenger RNA
MicroRNA
MicroRNAs
Mitogens
Phenols (Class of compounds)
Protein kinases
Proteins
RNA
Scientific equipment industry
Tumors
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Summary:Aberrant expression of microRNAs (miRNAs/miRs) mediates the initiation and progression of breast cancer. Therefore, it is important to investigate the molecular mechanisms of miRNAs and their effects on breast cancer progression. In the present study, miR-532-5p was highly expressed in breast cancer tissues compared with normal tissues. In addition, expression of ras-related and estrogen-regulated growth inhibitor (RERG), a tumor suppressor in breast cancer, was negatively correlated with miR-532-5p expression. Inhibition of miR-532-5p significantly elevated RERG at both mRNA and protein levels and inactivated the mitogen-activated protein kinase (MAPK)/ERK signaling pathway. Overexpression of miR-532-5p decreased RERG expression and activated the MAPK/ERK signaling in breast cancer cell line MDA-MB-231. Bioinformatic analysis indicated that RERG 3'-untraslated region contained a putative binding site for miR-532-5p. Dual luciferase assay further validated RERG as a target gene of miR-532-5p. Notably, downregulation of miR-532-5p inhibited MDA-MB-231 cell proliferation and migration, which was partially attenuated upon RERG knockdown. In conclusion, the current study revealed an oncogenic role of miR-532-5p in breast cancer cells via direct targeting of RERG expression.
ISSN:1792-0981
1792-1015
DOI:10.3892/etm.2019.8186