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Article

Inhibition of ubiquitin‑specific protease 14 promotes connexin 32 internalization and counteracts cisplatin cytotoxicity in human ovarian cancer cells

  • Authors:
    • Huimin Luo
    • Xiyan Wang
    • Hui Ge
    • Ningze Zheng
    • Fuhua Peng
    • Yile Fu
    • Liang Tao
    • Qin Wang
  • View Affiliations / Copyright

    Affiliations: Department of Pharmacology, Zhongshan School of Medicine, Sun Yat‑Sen University, Guangzhou, Guangdong 510080, P.R. China, Tumor Research Institute, Xinjiang Medical University Affiliated Tumor Hospital and State Key Laboratory Jointly Established by The Province and Ministry, Urumqi, Xinjiang Uygur Autonomous Region 830000, P.R. China
  • Pages: 1237-1247
    |
    Published online on: July 15, 2019
       https://doi.org/10.3892/or.2019.7232
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Abstract

Although cisplatin is one of the most accepted therapies for ovarian cancer, recurrence and drug resistance remain problematic. Both the ubiquitin‑proteasome system (UPS) and connexin (Cx) are closely related to tumor progression. However, the role of ubiquitin‑specific protease 14 (USP14) and Cx in mediating drug resistance remains unclear. In the present study, we aimed to determine whether USP14 is involved in cisplatin resistance and modulates the internalization of connexin 32 (Cx32) in ovarian cancer. The results of the deubiquitinase (DUB) trap assay and western blot analysis revealed that the expression and activity levels of USP14 were downregulated in A2780 cisplatin‑resistant cells (A2780‑CDDP) relative to these levels in A2780 cisplatin‑sensitive cells (A2780). CCK‑8 assay results showed that inhibition of USP14 by a specific inhibitor or siRNA decreased cisplatin cytotoxicity in A2780 cells. Additionally, USP14 inhibition increased the expression of Cx32 without changing its mRNA and ubiquitination levels, as showed by Real‑time qPCR and immunoprecipitation assay respectively. Cisplatin resistance induced by USP14 inhibition was counteracted by Cx32 knockdown. Moreover, USP14 inhibition contributed to Cx32 internalization, as determined by western blot analysis and a reduction in gap junction intercellular communication (GJIC), as showed by parachute dye‑coupling assay. Collectively, these data suggest that Cx32 internalization by USP14 inhibition modulates the cisplatin resistance in ovarian cancer cells, thus serving as a potential drug target to challenge chemotherapy failure. In addition, USP14 can also be used as a marker to monitor the development of cisplatin resistance in ovarian cancer treatment.
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Copy and paste a formatted citation
Spandidos Publications style
Luo H, Wang X, Ge H, Zheng N, Peng F, Fu Y, Tao L and Wang Q: Inhibition of ubiquitin‑specific protease 14 promotes connexin 32 internalization and counteracts cisplatin cytotoxicity in human ovarian cancer cells. Oncol Rep 42: 1237-1247, 2019.
APA
Luo, H., Wang, X., Ge, H., Zheng, N., Peng, F., Fu, Y. ... Wang, Q. (2019). Inhibition of ubiquitin‑specific protease 14 promotes connexin 32 internalization and counteracts cisplatin cytotoxicity in human ovarian cancer cells. Oncology Reports, 42, 1237-1247. https://doi.org/10.3892/or.2019.7232
MLA
Luo, H., Wang, X., Ge, H., Zheng, N., Peng, F., Fu, Y., Tao, L., Wang, Q."Inhibition of ubiquitin‑specific protease 14 promotes connexin 32 internalization and counteracts cisplatin cytotoxicity in human ovarian cancer cells". Oncology Reports 42.3 (2019): 1237-1247.
Chicago
Luo, H., Wang, X., Ge, H., Zheng, N., Peng, F., Fu, Y., Tao, L., Wang, Q."Inhibition of ubiquitin‑specific protease 14 promotes connexin 32 internalization and counteracts cisplatin cytotoxicity in human ovarian cancer cells". Oncology Reports 42, no. 3 (2019): 1237-1247. https://doi.org/10.3892/or.2019.7232
Copy and paste a formatted citation
x
Spandidos Publications style
Luo H, Wang X, Ge H, Zheng N, Peng F, Fu Y, Tao L and Wang Q: Inhibition of ubiquitin‑specific protease 14 promotes connexin 32 internalization and counteracts cisplatin cytotoxicity in human ovarian cancer cells. Oncol Rep 42: 1237-1247, 2019.
APA
Luo, H., Wang, X., Ge, H., Zheng, N., Peng, F., Fu, Y. ... Wang, Q. (2019). Inhibition of ubiquitin‑specific protease 14 promotes connexin 32 internalization and counteracts cisplatin cytotoxicity in human ovarian cancer cells. Oncology Reports, 42, 1237-1247. https://doi.org/10.3892/or.2019.7232
MLA
Luo, H., Wang, X., Ge, H., Zheng, N., Peng, F., Fu, Y., Tao, L., Wang, Q."Inhibition of ubiquitin‑specific protease 14 promotes connexin 32 internalization and counteracts cisplatin cytotoxicity in human ovarian cancer cells". Oncology Reports 42.3 (2019): 1237-1247.
Chicago
Luo, H., Wang, X., Ge, H., Zheng, N., Peng, F., Fu, Y., Tao, L., Wang, Q."Inhibition of ubiquitin‑specific protease 14 promotes connexin 32 internalization and counteracts cisplatin cytotoxicity in human ovarian cancer cells". Oncology Reports 42, no. 3 (2019): 1237-1247. https://doi.org/10.3892/or.2019.7232
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