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Article Open Access

Mucin 1 gene silencing inhibits the growth of SMMC-7721 human hepatoma cells through Bax-mediated mitochondrial and caspase-8-mediated death receptor apoptotic pathways

  • Authors:
    • Hongyan Yuan
    • Juan Wang
    • Fengli Wang
    • Nannan Zhang
    • Qiongshu Li
    • Fei Xie
    • Tanxiu Chen
    • Ruiping Zhai
    • Fang Wang
    • Yingying Guo
    • Weihua Ni
    • Guixiang Tai
  • View Affiliations / Copyright

    Affiliations: Department of Immunology, College of Basic Medical Science, Jilin University, Changchun, Jilin 130021, P.R. China, Department of Clinical Laboratory, Dalian Municipal Central Hospital, Dalian, Liaoning 116033, P.R. China
    Copyright: © Yuan et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 6782-6788
    |
    Published online on: September 14, 2015
       https://doi.org/10.3892/mmr.2015.4323
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Abstract

Mucin 1 (MUC1) is an oncogene that has a crucial role in the pathogenesis and progression of the majority of epithelial malignant tumors. Our previous study demonstrated that MUC1 gene silencing inhibited the growth of SMMC‑7721 cells in vitro and in vivo, however, whether this growth inhibition is associated with apoptotic cell death remains to be elucidated. In the present study, it was found that MUC1 gene silencing not only resulted in the inhibition of SMMC‑7721 cell growth, determined using a clone formation assay in vitro and a tumor xenograft mouse model with an in vivo imaging system, but also induced apoptotic alterations in SMMC‑7721 cells, determined using Hoechst 33342 staining, flow cytometry with an Annexin V-PE staining and a DNA ladder assay. Further investigation using western blotting revealed that cytochrome c was released from the mitochondria into the cytoplasm, and caspase‑8 and caspase‑9 were activated in MUC1 gene‑silenced SMMC‑7721 cells. The pro‑apoptotic protein Bcl‑2‑associated X protein (Bax) and the tumor suppressor p53 were increased, while the anti‑apoptotic protein B‑cell lymphoma 2 was decreased in MUC1 gene‑silenced cells. In addition, results from the co‑immunoprecipitation experiments demonstrated that the MUC1 cytoplasmic tail can bind directly to Bax or caspase‑8 and these interactions were reduced upon MUC1 gene silencing in SMMC‑7721 cells. The above results indicate that MUC1 gene silencing induces growth inhibition in SMMC‑7721 cells through Bax‑mediated mitochondrial and caspase-8-mediated death receptor apoptotic pathways.
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Copy and paste a formatted citation
Spandidos Publications style
Yuan H, Wang J, Wang F, Zhang N, Li Q, Xie F, Chen T, Zhai R, Wang F, Guo Y, Guo Y, et al: Mucin 1 gene silencing inhibits the growth of SMMC-7721 human hepatoma cells through Bax-mediated mitochondrial and caspase-8-mediated death receptor apoptotic pathways. Mol Med Rep 12: 6782-6788, 2015.
APA
Yuan, H., Wang, J., Wang, F., Zhang, N., Li, Q., Xie, F. ... Tai, G. (2015). Mucin 1 gene silencing inhibits the growth of SMMC-7721 human hepatoma cells through Bax-mediated mitochondrial and caspase-8-mediated death receptor apoptotic pathways. Molecular Medicine Reports, 12, 6782-6788. https://doi.org/10.3892/mmr.2015.4323
MLA
Yuan, H., Wang, J., Wang, F., Zhang, N., Li, Q., Xie, F., Chen, T., Zhai, R., Wang, F., Guo, Y., Ni, W., Tai, G."Mucin 1 gene silencing inhibits the growth of SMMC-7721 human hepatoma cells through Bax-mediated mitochondrial and caspase-8-mediated death receptor apoptotic pathways". Molecular Medicine Reports 12.5 (2015): 6782-6788.
Chicago
Yuan, H., Wang, J., Wang, F., Zhang, N., Li, Q., Xie, F., Chen, T., Zhai, R., Wang, F., Guo, Y., Ni, W., Tai, G."Mucin 1 gene silencing inhibits the growth of SMMC-7721 human hepatoma cells through Bax-mediated mitochondrial and caspase-8-mediated death receptor apoptotic pathways". Molecular Medicine Reports 12, no. 5 (2015): 6782-6788. https://doi.org/10.3892/mmr.2015.4323
Copy and paste a formatted citation
x
Spandidos Publications style
Yuan H, Wang J, Wang F, Zhang N, Li Q, Xie F, Chen T, Zhai R, Wang F, Guo Y, Guo Y, et al: Mucin 1 gene silencing inhibits the growth of SMMC-7721 human hepatoma cells through Bax-mediated mitochondrial and caspase-8-mediated death receptor apoptotic pathways. Mol Med Rep 12: 6782-6788, 2015.
APA
Yuan, H., Wang, J., Wang, F., Zhang, N., Li, Q., Xie, F. ... Tai, G. (2015). Mucin 1 gene silencing inhibits the growth of SMMC-7721 human hepatoma cells through Bax-mediated mitochondrial and caspase-8-mediated death receptor apoptotic pathways. Molecular Medicine Reports, 12, 6782-6788. https://doi.org/10.3892/mmr.2015.4323
MLA
Yuan, H., Wang, J., Wang, F., Zhang, N., Li, Q., Xie, F., Chen, T., Zhai, R., Wang, F., Guo, Y., Ni, W., Tai, G."Mucin 1 gene silencing inhibits the growth of SMMC-7721 human hepatoma cells through Bax-mediated mitochondrial and caspase-8-mediated death receptor apoptotic pathways". Molecular Medicine Reports 12.5 (2015): 6782-6788.
Chicago
Yuan, H., Wang, J., Wang, F., Zhang, N., Li, Q., Xie, F., Chen, T., Zhai, R., Wang, F., Guo, Y., Ni, W., Tai, G."Mucin 1 gene silencing inhibits the growth of SMMC-7721 human hepatoma cells through Bax-mediated mitochondrial and caspase-8-mediated death receptor apoptotic pathways". Molecular Medicine Reports 12, no. 5 (2015): 6782-6788. https://doi.org/10.3892/mmr.2015.4323
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