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Cancer Cell International
Published in: Cancer Cell International 1/2018

Open Access 01-12-2018 | Primary research

miR-506 attenuates methylation of lncRNA MEG3 to inhibit migration and invasion of breast cancer cell lines via targeting SP1 and SP3

Authors: Xin-Xing Wang, Guang-Cheng Guo, Xue-Ke Qian, Dong-Wei Dou, Zhe Zhang, Xiao-Dong Xu, Xin Duan, Xin-Hong Pei

Published in: Cancer Cell International | Issue 1/2018

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Abstract

Background

Breast cancer has been the first death cause of cancer in women all over the world. Metastasis is believed to be the most important process for treating breast cancer. There is evidence that lncRNA MEG3 functions as a tumor suppressor in breast cancer metastasis. However, upstream regulation of MEG3 in breast cancer remain elusive. Therefore, it is critical to elucidate the underlying mechanism upstream MEG3 to regulate breast cancer metastasis.

Methods

We employed RT-qPCR and Western blot to examine expression level of miR-506, DNMT1, SP1, SP3 and MEG3. Besides, methylation-specific PCR was used to determine the methylation level of MEG3 promoter. Wound healing assay and transwell invasion assay were utilized to measure migration and invasion ability of breast cancer cells, respectively.

Results

SP was upregulated while miR-506 and MEG3 were downregulated in breast tumor tissue compared to adjacent normal breast tissues. In addition, we found that miR-506 regulated DNMT1 expression in an SP1/SP3-dependent manner, which reduced methylation level of MEG3 promoter and upregulated MEG3 expression. SP3 knockdown or miR-506 mimic suppressed migration and invasion of MCF-7 and MDA-MB-231 cells whereas overexpression of SP3 compromised miR-506-inhibited migration and invasion.

Conclusions

Our data reveal a novel axis of miR-506/SP3/SP1/DNMT1/MEG3 in regulating migration and invasion of breast cancer cell lines, which provide rationales for developing effective therapies to treating metastatic breast cancers.
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Metadata
Title
miR-506 attenuates methylation of lncRNA MEG3 to inhibit migration and invasion of breast cancer cell lines via targeting SP1 and SP3
Authors
Xin-Xing Wang
Guang-Cheng Guo
Xue-Ke Qian
Dong-Wei Dou
Zhe Zhang
Xiao-Dong Xu
Xin Duan
Xin-Hong Pei
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Cancer Cell International / Issue 1/2018
Electronic ISSN: 1475-2867
DOI
https://doi.org/10.1186/s12935-018-0642-8

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