Interrelation of androgen receptor and miR‑30a and miR‑30a function in ER‑, PR‑, AR+ MDA‑MB‑453 breast cancer cells

Lyu,Shuhua; Liu,Han; Liu,Xia; Liu,Shan; Wang,Yahong; Yu,Qi; Niu,Yun

doi:10.3892/ol.2017.6781

Interrelation of androgen receptor and miR‑30a and miR‑30a function in ER‑, PR‑, AR+ MDA‑MB‑453 breast cancer cells

Authors:
- Shuhua Lyu
- Han Liu
- Xia Liu
- Shan Liu
- Yahong Wang
- Qi Yu
- Yun Niu
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Affiliations: Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy of Tianjin, Key Laboratory of Breast Cancer Prevention and Therapy, Tianjin Medical University, Ministry of Education, Ti Yuan Bei, Hexi, Tianjin 300060, P.R. China, Department of Oncology, Jinghai Hospital, Tianjin 301600, P.R. China
Published online on: August 21, 2017 https://doi.org/10.3892/ol.2017.6781
Pages: 4930-4936

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Abstract

The association between androgen‑induced androgen receptor (AR) activating signal and microRNA (miR)‑30a was investigated, as well as the function of miR‑30a in estrogen receptor‑negative (ER‑), progesterone receptor‑negative (PR‑), and AR‑positive (AR+) MDA‑MB‑453 breast cancer cells. Androgen‑induced AR activating signal upregulated the expression of AR, and downregulated the expression of miR‑30a, b and c. Bioinformatics analysis indicated a putative miR‑30a, b and c binding site in the 3'‑untranslated region of AR mRNA. It was confirmed that the AR gene is a direct target of miR‑30a, whereas AR does not target the miR‑30a promoter, and AR activating signal may indirectly downregulate miR‑30a through other cell signaling pathways. In this positive feedback mechanism AR is then upregulated through miR‑30a. Overexpression of miR‑30a inhibited cell proliferation, whereas inhibition of miR‑30a expression by specific antisense oligonucleotides, increased cell growth. Previously, androgen‑induced AR activating signal was demonstrated to inhibit cell proliferation in ER‑, PR‑ and AR+ MDA‑MB‑453 breast cancer cells, but AR activating signal downregulated the expression of miR‑30a, relieving the inhibition of MDA‑MB‑453 cell growth. Therefore, in MDA‑MB‑453 breast cancer cells, miR‑30a has two different functions regarding cell growth: Inhibition of cell proliferation through a positive feedback signaling pathway; and the relative promotion of cell proliferation through downregulation of miR‑30a. Thus, the association between AR activating signal and microRNAs is complex, and microRNAs may possess different functions due to different signaling pathways. Although the results of the present study were obtained in one cell line, they contribute to subsequent studies on ER‑, PR‑ and AR+ breast cancer.

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