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Article Open Access

Downregulation of SM22α protein by hypermethylation of its promoter in colorectal cancer

  • Authors:
    • Yabin Liu
    • Erqiang Wei
    • Jian Zhao
    • Dexian Kong
    • Binghui Li
  • View Affiliations / Copyright

    Affiliations: Department of General Surgery, The Fourth Affiliated Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China, Department of Obstetrics and Gynaecology, The Fourth Affiliated Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China, Department of Endocrinology, The Fourth Affiliated Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China
    Copyright: © Liu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 7675-7680
    |
    Published online on: March 26, 2018
       https://doi.org/10.3892/ol.2018.8350
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Abstract

Silencing of tumor suppressor genes by hypermethylation in gene promoter regions is a crucial mechanism in carcinogenesis. Gene methylation may be reversible and evaluated easily, thus providing a promising substrate for the development of biomarkers for the detection and prevention of cancer, including colorectal cancer (CRC). In the present study, the protein expression and methylation status of smooth muscle protein 22α (SM22α) was investigated in 78 cases of CRC and adjacent normal tissue. The aim of the study was to investigate the function of SM22α in the pathogenesis of CRC and to identify a candidate biomarker for the early detection of CRC. The methylation status of promoter of SM22α gene was detected using methylation‑specific polymerase chain reaction. The protein expression of SM22α was evaluated using western blot analysis. The results demonstrated a significant decrease of SM22α protein expression in 50 (68.5%) cases of CRC compared with that in adjacent normal tissues (P<0.001). The methylation status of SM22α promoter in CRC was significantly increased compared with that in adjacent normal tissues (P<0.001). Additionally, there was a negative correlation between the expression of SM22α protein and methylation levels of SM22α gene in CRC (P<0.001). Kaplan‑Meier curves revealed that patients with CRC with an unmethylated promoter of SM22α gene exhibited an increased survival time (34.8±0.6 vs. 30.9±1.3 months; P=0.025) compared with that in patients with a methylated promoter of SM22α gene. The present study demonstrated that the protein expression of SM22α is downregulated in CRC tissues by hypermethylation of its promoter, and that the methylation of SM22 α promoter may be used as a biomarker for early detection, prognosis and prediction of CRC.
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Copy and paste a formatted citation
Spandidos Publications style
Liu Y, Wei E, Zhao J, Kong D and Li B: Downregulation of SM22α protein by hypermethylation of its promoter in colorectal cancer. Oncol Lett 15: 7675-7680, 2018.
APA
Liu, Y., Wei, E., Zhao, J., Kong, D., & Li, B. (2018). Downregulation of SM22α protein by hypermethylation of its promoter in colorectal cancer. Oncology Letters, 15, 7675-7680. https://doi.org/10.3892/ol.2018.8350
MLA
Liu, Y., Wei, E., Zhao, J., Kong, D., Li, B."Downregulation of SM22α protein by hypermethylation of its promoter in colorectal cancer". Oncology Letters 15.5 (2018): 7675-7680.
Chicago
Liu, Y., Wei, E., Zhao, J., Kong, D., Li, B."Downregulation of SM22α protein by hypermethylation of its promoter in colorectal cancer". Oncology Letters 15, no. 5 (2018): 7675-7680. https://doi.org/10.3892/ol.2018.8350
Copy and paste a formatted citation
x
Spandidos Publications style
Liu Y, Wei E, Zhao J, Kong D and Li B: Downregulation of SM22α protein by hypermethylation of its promoter in colorectal cancer. Oncol Lett 15: 7675-7680, 2018.
APA
Liu, Y., Wei, E., Zhao, J., Kong, D., & Li, B. (2018). Downregulation of SM22α protein by hypermethylation of its promoter in colorectal cancer. Oncology Letters, 15, 7675-7680. https://doi.org/10.3892/ol.2018.8350
MLA
Liu, Y., Wei, E., Zhao, J., Kong, D., Li, B."Downregulation of SM22α protein by hypermethylation of its promoter in colorectal cancer". Oncology Letters 15.5 (2018): 7675-7680.
Chicago
Liu, Y., Wei, E., Zhao, J., Kong, D., Li, B."Downregulation of SM22α protein by hypermethylation of its promoter in colorectal cancer". Oncology Letters 15, no. 5 (2018): 7675-7680. https://doi.org/10.3892/ol.2018.8350
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