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TCRP1 induces tamoxifen resistance by promoting the activation of SGK1 in MCF‑7 cells

  • Authors:
    • Shuai Zhao
    • Xiaohua Li
    • Lei Yin
    • Lili Hou
    • Jing Lan
    • Xun Zhu
  • View Affiliations / Copyright

    Affiliations: Department of Breast and Thyroid Surgery, Wuzhong People's Hospital of Suzhou City, Suzhou, Jiangsu 215128, P.R. China, Department of General Surgery, The First Hospital Affiliated of Suzhou University, Suzhou, Jiangsu 215006, P.R. China, Department of Breast and Thyroid Surgery, The Second Affiliated Hospital of Suzhou University, Suzhou, Jiangsu 215004, P.R. China
    Copyright: © Zhao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 2017-2027
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    Published online on: April 3, 2020
       https://doi.org/10.3892/or.2020.7577
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Abstract

Tamoxifen is widely used as a highly effective drug for treating estrogen‑receptor (ER) alpha‑positive breast cancer. However, tamoxifen resistance developed during cancer treatment remains a significant challenge. Tongue cancer resistance‑related protein1 (TCRP1), which is recognized as a novel drug target, is related to chemo‑resistance in human cancers, moreover, it is often overexpressed in various cancer cells, such as in lung cancer, breast cancer, and tongue cancer. However, the effects of TCRP1 on tamoxifen‑resistant breast cancer cells and tissues are far from clear. The present study revealed that TCRP1 induced tamoxifen resistance in breast cancer cells. Western blotting, quantitative real‑time polymerase chain reaction (RT‑PCR) and immunohistochemical staining were performed to detect the expression level of TCRP1 in vivo and in vitro between primary breast cancer tissues and tamoxifen‑resistant breast cancer tissues. The data revealed that the expression of TCRP1 was upregulated in the tamoxifen‑resistant breast cancer tissues and human breast cancer cell line, MCF‑7. Further study revealed that knocking down TCRP1 inhibited the growth of MCF‑7 cells with tamoxifen‑resistance (MCF7‑R cells) and induced cell apoptosis. Moreover, TCRP1 promoted serum‑ and glucocorticoid‑inducible kinase 1 (SGK1) activation via phosphorylation of phosphoinositide‑dependent kinase 1 (PDK1) in MCF7‑R cells. In addition, it was also observed that knocking down TCRP1 inhibited tumorigenesis of MCF‑7 cells in nude mice. In conclusion, these data indicated that TCRP1 could induce tamoxifen resistance by regulating the PDK1/SGK1 signaling pathway. Thus, TCRP1 could be explored as a promising candidate for treating tamoxifen‑resistant breast cancer in the future.
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Copy and paste a formatted citation
Spandidos Publications style
Zhao S, Li X, Yin L, Hou L, Lan J and Zhu X: TCRP1 induces tamoxifen resistance by promoting the activation of SGK1 in MCF‑7 cells. Oncol Rep 43: 2017-2027, 2020.
APA
Zhao, S., Li, X., Yin, L., Hou, L., Lan, J., & Zhu, X. (2020). TCRP1 induces tamoxifen resistance by promoting the activation of SGK1 in MCF‑7 cells. Oncology Reports, 43, 2017-2027. https://doi.org/10.3892/or.2020.7577
MLA
Zhao, S., Li, X., Yin, L., Hou, L., Lan, J., Zhu, X."TCRP1 induces tamoxifen resistance by promoting the activation of SGK1 in MCF‑7 cells". Oncology Reports 43.6 (2020): 2017-2027.
Chicago
Zhao, S., Li, X., Yin, L., Hou, L., Lan, J., Zhu, X."TCRP1 induces tamoxifen resistance by promoting the activation of SGK1 in MCF‑7 cells". Oncology Reports 43, no. 6 (2020): 2017-2027. https://doi.org/10.3892/or.2020.7577
Copy and paste a formatted citation
x
Spandidos Publications style
Zhao S, Li X, Yin L, Hou L, Lan J and Zhu X: TCRP1 induces tamoxifen resistance by promoting the activation of SGK1 in MCF‑7 cells. Oncol Rep 43: 2017-2027, 2020.
APA
Zhao, S., Li, X., Yin, L., Hou, L., Lan, J., & Zhu, X. (2020). TCRP1 induces tamoxifen resistance by promoting the activation of SGK1 in MCF‑7 cells. Oncology Reports, 43, 2017-2027. https://doi.org/10.3892/or.2020.7577
MLA
Zhao, S., Li, X., Yin, L., Hou, L., Lan, J., Zhu, X."TCRP1 induces tamoxifen resistance by promoting the activation of SGK1 in MCF‑7 cells". Oncology Reports 43.6 (2020): 2017-2027.
Chicago
Zhao, S., Li, X., Yin, L., Hou, L., Lan, J., Zhu, X."TCRP1 induces tamoxifen resistance by promoting the activation of SGK1 in MCF‑7 cells". Oncology Reports 43, no. 6 (2020): 2017-2027. https://doi.org/10.3892/or.2020.7577
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