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Beclin1 overexpression suppresses tumor cell proliferation and survival via an autophagy‑dependent pathway in human synovial sarcoma cells

  • Authors:
    • Jialin Zhu
    • Yongsong Cai
    • Ke Xu
    • Xiaoyu Ren
    • Jian Sun
    • Shemin Lu
    • Jinghong Chen
    • Peng Xu
  • View Affiliations / Copyright

    Affiliations: Department of Joint Surgery, Xi'an Hong Hui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi 710054, P.R. China, Department of Joint Surgery, Xi'an Hong Hui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi 710054, P.R. China, Department of Genetics and Molecular Biology, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi 710061, P.R. China, Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, Institute of Endemic Diseases, School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi 710061, P.R. China
    Copyright: © Zhu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 1927-1936
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    Published online on: July 25, 2018
       https://doi.org/10.3892/or.2018.6599
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Abstract

Beclin1 is an important autophagy‑related prot­ein, which is involved in both autophagy and apoptosis. In recent years, the antitumor effect of Beclin1 has received increased attention. In the present study, we established a stable Beclin1‑overexpressing cell line with SW982 human synovial sarcoma cells. We found that Beclin1 overexpression decreased the cell viability, inhibited proliferation and induced apoptosis in SW982 cells. The expression levels of Bcl‑2 and PCNA were decreased, while the levels of cleaved‑caspase‑3 and cleaved‑PARP were increased. Beclin1 is closely related with autophagy, thus the autophagy‑related markers LC3 and p62 were detected by western blot analysis, and transmission electron microscopy was used to observe autophagosomes. The results showed that the expression level of LC3II was increased and that of p62 was decreased. Moreover, many double membrane‑enclosed autophagosomes were found in cells with Beclin1 overexpression, which indicated that the autophagic activity was enhanced. To explore the effect of autophagy on the viability of SW982 cells, Atg5 was knocked down using siRNA to inhibit the autophagic activity. We found that autophagy contributed to the decrease in cell viability. Knockdown of Atg5 increased the viability and decreased the apoptotic rate of SW982 cells with Beclin1 overexpression. The expression level of Bcl‑2 was increased, while the expression levels of cleaved‑caspase‑3 and cleaved‑PARP were decreased. We also found that the Akt/Bcl‑2/caspase‑9 pathway was involved. The phosphorylation of AKT was positively correlated with cell viability. The cleavage of caspase‑9 was increased by Beclin1 overexpression and decreased by inhibition of autophagy. Altogether, our results suggested that both autophagy and apoptosis contributed to the antitumor effect of Beclin1 in SW982 cells.
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Spandidos Publications style
Zhu J, Cai Y, Xu K, Ren X, Sun J, Lu S, Chen J and Xu P: Beclin1 overexpression suppresses tumor cell proliferation and survival via an autophagy‑dependent pathway in human synovial sarcoma cells. Oncol Rep 40: 1927-1936, 2018.
APA
Zhu, J., Cai, Y., Xu, K., Ren, X., Sun, J., Lu, S. ... Xu, P. (2018). Beclin1 overexpression suppresses tumor cell proliferation and survival via an autophagy‑dependent pathway in human synovial sarcoma cells. Oncology Reports, 40, 1927-1936. https://doi.org/10.3892/or.2018.6599
MLA
Zhu, J., Cai, Y., Xu, K., Ren, X., Sun, J., Lu, S., Chen, J., Xu, P."Beclin1 overexpression suppresses tumor cell proliferation and survival via an autophagy‑dependent pathway in human synovial sarcoma cells". Oncology Reports 40.4 (2018): 1927-1936.
Chicago
Zhu, J., Cai, Y., Xu, K., Ren, X., Sun, J., Lu, S., Chen, J., Xu, P."Beclin1 overexpression suppresses tumor cell proliferation and survival via an autophagy‑dependent pathway in human synovial sarcoma cells". Oncology Reports 40, no. 4 (2018): 1927-1936. https://doi.org/10.3892/or.2018.6599
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Spandidos Publications style
Zhu J, Cai Y, Xu K, Ren X, Sun J, Lu S, Chen J and Xu P: Beclin1 overexpression suppresses tumor cell proliferation and survival via an autophagy‑dependent pathway in human synovial sarcoma cells. Oncol Rep 40: 1927-1936, 2018.
APA
Zhu, J., Cai, Y., Xu, K., Ren, X., Sun, J., Lu, S. ... Xu, P. (2018). Beclin1 overexpression suppresses tumor cell proliferation and survival via an autophagy‑dependent pathway in human synovial sarcoma cells. Oncology Reports, 40, 1927-1936. https://doi.org/10.3892/or.2018.6599
MLA
Zhu, J., Cai, Y., Xu, K., Ren, X., Sun, J., Lu, S., Chen, J., Xu, P."Beclin1 overexpression suppresses tumor cell proliferation and survival via an autophagy‑dependent pathway in human synovial sarcoma cells". Oncology Reports 40.4 (2018): 1927-1936.
Chicago
Zhu, J., Cai, Y., Xu, K., Ren, X., Sun, J., Lu, S., Chen, J., Xu, P."Beclin1 overexpression suppresses tumor cell proliferation and survival via an autophagy‑dependent pathway in human synovial sarcoma cells". Oncology Reports 40, no. 4 (2018): 1927-1936. https://doi.org/10.3892/or.2018.6599
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