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Article

Ubenimex inhibits cell proliferation, migration and invasion in renal cell carcinoma: The effect is autophagy-associated

  • Authors:
    • Shuai Liu
    • Fang Xie
    • Hafeng Wang
    • Zheng Liu
    • Xiaowen Liu
    • Liang Sun
    • Zhihong Niu
  • View Affiliations / Copyright

    Affiliations: Department of Urology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250021, P.R. China, Department of Urology, Weihai Municipal Hospital, Weihai, Shandong 264200, P.R. China, Department of Urology, QiHe People's Hospital, Dezhou, Shandong 251100, P.R. China
  • Pages: 1372-1380
    |
    Published online on: December 23, 2014
       https://doi.org/10.3892/or.2014.3693
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Abstract

Ubenimex is a low-molecular-weight dipeptide with the ability to inhibit aminopeptidase N (APN) activity, enhance the function of immunocompetent cells and confer antitumor effects. We sought to characterize the effects of ubenimex on renal cell carcinoma (RCC). The 786-O and OS-RC-2 human RCC cell lines were positive for APN expression and ubenimex decreased APN activity without affecting the expression. Ubenimex suppressed the proliferation of both cell lines in a concentration‑dependent manner, as assessed by curve growth analysis and WST-8 proliferation assay. Wound healing and Matrigel invasion assays demonstrated that the migration and invasion of the RCC cells were also markedly suppressed by ubenimex. Furthermore, ubenimex increased the mortality of both RCC cell lines as determined by the LDH cytotoxicity assay. This affect was accompanied by increased levels of LC3B with no apparent effect on Caspase3; and we observed that autophagy increased significantly after ubenimex treatment in both RCC cell lines by electron microscopy. Moreover, rapamycin enhanced the cytotoxic effect of ubenimex, while 3-methyladenine reversed the effect, indicating that ubenimex cytotoxicity occured through an autophagy-related mechanism. To further assess the potential applicability of ubenimex in the treatment of RCC, we performed immunohistochemistry using tissue microarrays representing 76 RCC patients that underwent radical nephrectomy. The results showed that APN was expressed in most, but not all of the RCC tissues and that the expression was reduced in RCC as compared to the normal kidney tissues, suggesting a potential role for APN in RCC development. Collectively, these results indicated that ubenimex inhibits proliferation, migration and invasion of RCC cells. Ubenimex may induce autophagy, which may be associated with its effect on the growth arrest and the cell death of RCC cells.
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Copy and paste a formatted citation
Spandidos Publications style
Liu S, Xie F, Wang H, Liu Z, Liu X, Sun L and Niu Z: Ubenimex inhibits cell proliferation, migration and invasion in renal cell carcinoma: The effect is autophagy-associated. Oncol Rep 33: 1372-1380, 2015.
APA
Liu, S., Xie, F., Wang, H., Liu, Z., Liu, X., Sun, L., & Niu, Z. (2015). Ubenimex inhibits cell proliferation, migration and invasion in renal cell carcinoma: The effect is autophagy-associated. Oncology Reports, 33, 1372-1380. https://doi.org/10.3892/or.2014.3693
MLA
Liu, S., Xie, F., Wang, H., Liu, Z., Liu, X., Sun, L., Niu, Z."Ubenimex inhibits cell proliferation, migration and invasion in renal cell carcinoma: The effect is autophagy-associated". Oncology Reports 33.3 (2015): 1372-1380.
Chicago
Liu, S., Xie, F., Wang, H., Liu, Z., Liu, X., Sun, L., Niu, Z."Ubenimex inhibits cell proliferation, migration and invasion in renal cell carcinoma: The effect is autophagy-associated". Oncology Reports 33, no. 3 (2015): 1372-1380. https://doi.org/10.3892/or.2014.3693
Copy and paste a formatted citation
x
Spandidos Publications style
Liu S, Xie F, Wang H, Liu Z, Liu X, Sun L and Niu Z: Ubenimex inhibits cell proliferation, migration and invasion in renal cell carcinoma: The effect is autophagy-associated. Oncol Rep 33: 1372-1380, 2015.
APA
Liu, S., Xie, F., Wang, H., Liu, Z., Liu, X., Sun, L., & Niu, Z. (2015). Ubenimex inhibits cell proliferation, migration and invasion in renal cell carcinoma: The effect is autophagy-associated. Oncology Reports, 33, 1372-1380. https://doi.org/10.3892/or.2014.3693
MLA
Liu, S., Xie, F., Wang, H., Liu, Z., Liu, X., Sun, L., Niu, Z."Ubenimex inhibits cell proliferation, migration and invasion in renal cell carcinoma: The effect is autophagy-associated". Oncology Reports 33.3 (2015): 1372-1380.
Chicago
Liu, S., Xie, F., Wang, H., Liu, Z., Liu, X., Sun, L., Niu, Z."Ubenimex inhibits cell proliferation, migration and invasion in renal cell carcinoma: The effect is autophagy-associated". Oncology Reports 33, no. 3 (2015): 1372-1380. https://doi.org/10.3892/or.2014.3693
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