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Cancer Cell International
Published in: Cancer Cell International 1/2017

Open Access 01-12-2017 | Primary Research

miR-1296-5p decreases ERBB2 expression to inhibit the cell proliferation in ERBB2-positive breast cancer

Authors: Gang Chen, Mingfeng He, Yin Yin, Ting Yan, Wenfang Cheng, Zebo Huang, Lan Zhang, Huo Zhang, Ping Liu, Wei Zhu, Yichao Zhu

Published in: Cancer Cell International | Issue 1/2017

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Abstract

Background

The tumor suppressive role of miR-1296 is observed in triple negative breast cancer (TNBC). However, the effect of miR-1296-5p in ERBB2-positive breast cancers remains obscure.

Methods

Whether ERBB2 was the target gene of the miR-1296-5p was predicted by online software, and determined by dual-luciferase activity assay. miR-1296-5p expression levels were determined in breast cancer samples (114 breast cancer tissues and 30 adjacent normal tissues) by using qRT-PCR. The effect of miR-1296-5p and inhibition of ERBB2/mTORC1 signaling on the downstream target was assessed by Western blot. SK-BR-3 and BT-474 breast cancer cell line was transfected with miR-1296-5p mimic after which cell proliferation and apoptosis were determined by the clonogenic assay and the flow cytometry system, respectively. In addition, the chemotherapeutic drug sensitivity of SK-BR-3 and BT-474 cells transfected with miR-1296-5p mimic were determined by MTT assay.

Results

The luciferase assay carrying ERBB2 3′-untranslated region-based reporters expressed in SK-BR-3 and BT-474 cells suggested that ERBB2 was the target gene of miR-1296-5p. MiR-1296-5p was significantly decreased in breast cancer tissues compared to adjacent normal tissues. Moreover, it was declined in ERBB2-positive breast cancer samples compared with that in ERBB2-negative breast cancer tissues. Overexpressed miR-1296-5p reduced its target protein level and mTORC1/S6 activation, inhibited the proliferation of ERBB2-positive breast cancer cells and sensitized these cells to cisplatin and 5-fluorouracil-induced apoptosis.

Conclusions

Our findings suggest that miR-1296-5p is involved in the regulation of proliferation in breast cancer cells via targeting ERBB2/mTORC1 signaling pathway.
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Metadata
Title
miR-1296-5p decreases ERBB2 expression to inhibit the cell proliferation in ERBB2-positive breast cancer
Authors
Gang Chen
Mingfeng He
Yin Yin
Ting Yan
Wenfang Cheng
Zebo Huang
Lan Zhang
Huo Zhang
Ping Liu
Wei Zhu
Yichao Zhu
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Cancer Cell International / Issue 1/2017
Electronic ISSN: 1475-2867
DOI
https://doi.org/10.1186/s12935-017-0466-y

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