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Knockdown of eukaryotic translation initiation factor 5A2 enhances the therapeutic efficiency of doxorubicin in hepatocellular carcinoma cells by triggering lethal autophagy

  • Authors:
    • Yuexiao Tang
    • Ke Chen
    • Xiaorui Luan
    • Jinyan Zhang
    • Rongrong Liu
    • Xiaoxiao Zheng
    • Shangzhi Xie
    • Haiping Ke
    • Xianning Zhang
    • Wei Chen
  • View Affiliations / Copyright

    Affiliations: Department of Genetics, Zhejiang Provincial Key Laboratory of Genetic and Developmental Disorders, Institute of Cell Biology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China, Department of General Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310016, P.R. China, Division of Hematology‑Oncology, Children's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, P.R. China, Cancer Institute of Integrated Traditional Chinese and Western Medicine, Zhejiang Academy of Traditional Chinese Medicine, Tongde Hospital of Zhejiang Province, Hangzhou, Zhejiang 310012, P.R. China, Department of Biology, Ningbo College of Health Sciences, Ningbo, Zhejiang 315100, P.R. China
    Copyright: © Tang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 1368-1380
    |
    Published online on: November 2, 2020
       https://doi.org/10.3892/ijo.2020.5143
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Abstract

Hepatocellular carcinoma (HCC) is an invasive malignant neoplasm with a poor prognosis. The development of chemoresistance severely obstructs the chemotherapeutic efficiency of HCC treatment. Therefore, understanding the mechanisms of chemoresistance is important for improving the outcomes of patients with HCC. Eukaryotic translation initiation factor 5A2 (eIF5A2), which is considered to be an oncogene, has been reported to mediate chemoresistance in various types of cancer; however, its precise role in HCC remains unclear. Accumulating evidence has suggested that autophagy serves a dual role in cancer chemotherapy. The present study aimed to investigate the role of autophagy in eIF5A2‑mediated doxorubicin resistance in HCC. High expression levels of eIF5A2 in human HCC tissues were observed by immunohistochemistry using a tissue microarray, which was consistent with the results of reverse transcription‑quantitative PCR analysis in paired HCC and adjacent healthy tissues. HCC patient‑derived tumor xenograft mouse model was used for the in vivo study, and knockdown of eIF5A2 effectively enhanced the efficacy of doxorubicin chemotherapy compared with that in the control group. Notably, eIF5A2 served as a repressor in regulating autophagy under chemotherapy. Silencing of eIF5A2 induced doxorubicin sensitivity in HCC cells by triggering lethal autophagy. In addition, 5‑ethynyl‑2'‑deoxyuridine, lactate dehydrogenase release assay and calcein‑AM/PI staining were used to determine the enhanced autophagic cell death induced by the silencing of eIF5A2 under doxorubicin treatment. Suppression of autophagy attenuated the sensitivity of HCC cells to doxorubicin induced by eIF5A2 silencing. The results also demonstrated that knockdown of the Beclin 1 gene, which is an autophagy regulator, reversed the enhanced autophagic cell death and doxorubicin sensitivity induced by eIF5A2 silencing. Taken together, these results suggested eIF5A2 may mediate the chemoresistance of HCC cells by suppressing autophagic cell death under chemotherapy through a Beclin 1‑dependent pathway, and that eIF5A2 may be a novel potential therapeutic target for HCC treatment.
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Copy and paste a formatted citation
Spandidos Publications style
Tang Y, Chen K, Luan X, Zhang J, Liu R, Zheng X, Xie S, Ke H, Zhang X, Chen W, Chen W, et al: Knockdown of eukaryotic translation initiation factor 5A2 enhances the therapeutic efficiency of doxorubicin in hepatocellular carcinoma cells by triggering lethal autophagy. Int J Oncol 57: 1368-1380, 2020.
APA
Tang, Y., Chen, K., Luan, X., Zhang, J., Liu, R., Zheng, X. ... Chen, W. (2020). Knockdown of eukaryotic translation initiation factor 5A2 enhances the therapeutic efficiency of doxorubicin in hepatocellular carcinoma cells by triggering lethal autophagy. International Journal of Oncology, 57, 1368-1380. https://doi.org/10.3892/ijo.2020.5143
MLA
Tang, Y., Chen, K., Luan, X., Zhang, J., Liu, R., Zheng, X., Xie, S., Ke, H., Zhang, X., Chen, W."Knockdown of eukaryotic translation initiation factor 5A2 enhances the therapeutic efficiency of doxorubicin in hepatocellular carcinoma cells by triggering lethal autophagy". International Journal of Oncology 57.6 (2020): 1368-1380.
Chicago
Tang, Y., Chen, K., Luan, X., Zhang, J., Liu, R., Zheng, X., Xie, S., Ke, H., Zhang, X., Chen, W."Knockdown of eukaryotic translation initiation factor 5A2 enhances the therapeutic efficiency of doxorubicin in hepatocellular carcinoma cells by triggering lethal autophagy". International Journal of Oncology 57, no. 6 (2020): 1368-1380. https://doi.org/10.3892/ijo.2020.5143
Copy and paste a formatted citation
x
Spandidos Publications style
Tang Y, Chen K, Luan X, Zhang J, Liu R, Zheng X, Xie S, Ke H, Zhang X, Chen W, Chen W, et al: Knockdown of eukaryotic translation initiation factor 5A2 enhances the therapeutic efficiency of doxorubicin in hepatocellular carcinoma cells by triggering lethal autophagy. Int J Oncol 57: 1368-1380, 2020.
APA
Tang, Y., Chen, K., Luan, X., Zhang, J., Liu, R., Zheng, X. ... Chen, W. (2020). Knockdown of eukaryotic translation initiation factor 5A2 enhances the therapeutic efficiency of doxorubicin in hepatocellular carcinoma cells by triggering lethal autophagy. International Journal of Oncology, 57, 1368-1380. https://doi.org/10.3892/ijo.2020.5143
MLA
Tang, Y., Chen, K., Luan, X., Zhang, J., Liu, R., Zheng, X., Xie, S., Ke, H., Zhang, X., Chen, W."Knockdown of eukaryotic translation initiation factor 5A2 enhances the therapeutic efficiency of doxorubicin in hepatocellular carcinoma cells by triggering lethal autophagy". International Journal of Oncology 57.6 (2020): 1368-1380.
Chicago
Tang, Y., Chen, K., Luan, X., Zhang, J., Liu, R., Zheng, X., Xie, S., Ke, H., Zhang, X., Chen, W."Knockdown of eukaryotic translation initiation factor 5A2 enhances the therapeutic efficiency of doxorubicin in hepatocellular carcinoma cells by triggering lethal autophagy". International Journal of Oncology 57, no. 6 (2020): 1368-1380. https://doi.org/10.3892/ijo.2020.5143
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