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Erschienen in: Breast Cancer Research and Treatment 3/2013

01.06.2013 | Preclinical Study

MiR-181a enhances drug sensitivity in mitoxantone-resistant breast cancer cells by targeting breast cancer resistance protein (BCRP/ABCG2)

verfasst von: Xuyang Jiao, Lin Zhao, Mengtao Ma, Xuefeng Bai, Miao He, Yuanyuan Yan, Yan Wang, Qiuchen Chen, Xinnan Zhao, Mingyi Zhou, Zeshi Cui, Zhihong Zheng, Enhua Wang, Minjie Wei

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 3/2013

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Abstract

Breast cancer resistance protein (BCRP)/ATP-binding cassette subfamily G member 2 (ABCG2) mediates multidrug resistance (MDR) in breast cancers. In this study, we aimed to investigate the role of microRNAs in regulation of BCRP expression and BCRP-mediated drug resistance in breast cancer cells. Microarray analysis was performed to determine the differential expression patterns of miRNAs that target BCRP between the MX-resistant breast cancer cell line MCF-7/MX and its parental MX-sensitive cell line MCF-7. MiR-181a was found to be the most significantly down-regulated miRNA in MCF-7/MX cells. Luciferase activity assay showed that miR-181a mimics inhibited BCRP expression by targeting the 3′ untranslated region (UTR) of the BCRP mRNA. Overexpression of miR-181a down-regulated BCRP expression, and sensitized MX-resistant MCF-7/MX cells to MX. In a nude mouse xenograft model, intratumoral injection of miR-181a mimics inhibited BCRP expression, and enhanced the antitumor activity of MX. In addition, miR-181a inhibitors up-regulated BCRP expression, and rendered MX-sensitive MCF-7 cells resistant to MX. These findings suggest that miR-181a regulates BCRP expression via binding to the 3′-UTR of BCRP mRNA. MiR-181a is critical for regulation of BCRP-mediated resistance to MX. MiR-181a may be a potential target for preventing and reversing drug resistance in breast cancer.
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Metadaten
Titel
MiR-181a enhances drug sensitivity in mitoxantone-resistant breast cancer cells by targeting breast cancer resistance protein (BCRP/ABCG2)
verfasst von
Xuyang Jiao
Lin Zhao
Mengtao Ma
Xuefeng Bai
Miao He
Yuanyuan Yan
Yan Wang
Qiuchen Chen
Xinnan Zhao
Mingyi Zhou
Zeshi Cui
Zhihong Zheng
Enhua Wang
Minjie Wei
Publikationsdatum
01.06.2013
Verlag
Springer US
Erschienen in
Breast Cancer Research and Treatment / Ausgabe 3/2013
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-013-2607-x

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