Suppression of long non-coding RNA CCAT2 improves tamoxifen-resistant breast cancer cells’ response to tamoxifen

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• 作者：Y. Caia ; J. He ; D. Zhang
• 关键词：long non ; coding RNAs ; CCAT2 ; breast cancer ; tamoxifen resistance
• 刊名：Molecular Biology
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：50
• 期：5
• 页码：725-730
• 全文大小：545 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Life Sciences
  Biochemistry
  Human Genetics
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3245
• 卷排序：50

文摘

Breast cancer is one of the most common cancers in women worldwide. Tamoxifen (TAM) provided a successful treatment for ER-positive (ER+) breast cancer for many years. However, ER+ patients with metastatic diseases respond poorly to TAM therapy and many initial responders eventually relapse. Emerging evidence indicates that long non-coding RNAs (lncRNAs) may have a critical role in the regulation of cellular processes such as cancer progression and metastasis, though the function of lncRNAs in TAM-resistance is still unclear. To investigate the role of CCAT2 in the development of resistance to TAM treatment of breast cancer, we established TAM-resistant models in MCF-7 and T47D cells. The present study demonstrates that TAM-resistant cells show a higher level of CCAT2 expression compared with TAM-sensitive cells. Biologically, CCAT2 knockdown could inhibit proliferation and induce apoptosis in TAM-resistant cells exposed to TAM. Furthermore, knockdown of CCAT2 improves the sensitivity to TAM in TAM-resistant cells. Overall, the study results provide a novel therapeutic approach for TAM-resistant patients through depleting CCAT2 expression.