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Article

Methylated +322-327 CpG site decreases hOGG1 mRNA expression in non-small cell lung cancer

  • Authors:
    • Yuanyuan Zeng
    • Jianjie Zhu
    • Hualong Qin
    • Dan Shen
    • Zhe Lei
    • Wei Li
    • Zongli Ding
    • Jian-An Huang
    • Zeyi Liu
  • View Affiliations / Copyright

    Affiliations: Department of Respiratory Medicine, the First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, P.R. China, Department of Cardiothoracic surgery, the First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, P.R. China, Suzhou Key Laboratory for Molecular Cancer Genetics, Suzhou, Jiangsu, P.R. China, Department of Oncology, the First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, P.R. China
  • Pages: 529-537
    |
    Published online on: June 1, 2017
       https://doi.org/10.3892/or.2017.5690
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Abstract

hOGG1 plays a role in several disease pathways, including various cancers. Despite such functional importance, how hOGG1 is regulated at the transcriptional level in human non-small cell lung cancer (NSCLC) remains unknown, particularly via DNA methylation changes. We obtained NSCLC tissues and adjacent non-cancerous tissues and examined hOGG1 mRNA expression levels. NSCLC cells were treated with 5-Aza to test whether DNA methylation can influence the expression of hOGG1. The MassARRAY EpiTYPER and luciferase reporter gene assays were used to define the functional region of the hOGG1 gene (including CpG sites). Finally, ChIP assay was utilized to verify transcription factor binding to the hOGG1 5'-UTR region. Our previous studies supported the idea that the methylation of the hOGG1 gene promoter region occurs frequently in NSCLC. Treatment with 5-Aza, a demethylating agent, led to a significant restoration of hOGG1 expression in NSCLC cell lines. Quantitative PCR and MassARRAY EpiTYPER assays demonstrated that methylation of the +322-327 CpG site in the 5'-UTR region of hOGG1 was higher in NSCLC tissues compared with adjacent non-cancerous tissues. Notably, the methylation level of +322-327 site (T/N) was inversely correlated with that of hOGG1 mRNA level (T/N) in 25 NSCLC tissues. ChIP assay and in silico prediction showed an association between the +322-327 CpG site and Sp1, which has been reported to be an activator of transcription. Importantly, luciferase reporter gene and ChIP assays showed that +322-327 CpG site methylation particularly reduced the recruitment of Sp1 to the 5'-UTR sequence in hOGG1 and reduced transcriptional activity ~50%. In summary, we have demonstrated that hOGG1 mRNA is downregulated in NSCLC tissues. Moreover, we identified that the methylated +322-327 CpG site in the hOGG1 5'-UTR is associated with reduced expression of hOGG1 by decreasing the recruitment of Sp1 to the 5'-UTR of hOGG1.
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Copy and paste a formatted citation
Spandidos Publications style
Zeng Y, Zhu J, Qin H, Shen D, Lei Z, Li W, Ding Z, Huang J and Liu Z: Methylated +322-327 CpG site decreases hOGG1 mRNA expression in non-small cell lung cancer. Oncol Rep 38: 529-537, 2017.
APA
Zeng, Y., Zhu, J., Qin, H., Shen, D., Lei, Z., Li, W. ... Liu, Z. (2017). Methylated +322-327 CpG site decreases hOGG1 mRNA expression in non-small cell lung cancer. Oncology Reports, 38, 529-537. https://doi.org/10.3892/or.2017.5690
MLA
Zeng, Y., Zhu, J., Qin, H., Shen, D., Lei, Z., Li, W., Ding, Z., Huang, J., Liu, Z."Methylated +322-327 CpG site decreases hOGG1 mRNA expression in non-small cell lung cancer". Oncology Reports 38.1 (2017): 529-537.
Chicago
Zeng, Y., Zhu, J., Qin, H., Shen, D., Lei, Z., Li, W., Ding, Z., Huang, J., Liu, Z."Methylated +322-327 CpG site decreases hOGG1 mRNA expression in non-small cell lung cancer". Oncology Reports 38, no. 1 (2017): 529-537. https://doi.org/10.3892/or.2017.5690
Copy and paste a formatted citation
x
Spandidos Publications style
Zeng Y, Zhu J, Qin H, Shen D, Lei Z, Li W, Ding Z, Huang J and Liu Z: Methylated +322-327 CpG site decreases hOGG1 mRNA expression in non-small cell lung cancer. Oncol Rep 38: 529-537, 2017.
APA
Zeng, Y., Zhu, J., Qin, H., Shen, D., Lei, Z., Li, W. ... Liu, Z. (2017). Methylated +322-327 CpG site decreases hOGG1 mRNA expression in non-small cell lung cancer. Oncology Reports, 38, 529-537. https://doi.org/10.3892/or.2017.5690
MLA
Zeng, Y., Zhu, J., Qin, H., Shen, D., Lei, Z., Li, W., Ding, Z., Huang, J., Liu, Z."Methylated +322-327 CpG site decreases hOGG1 mRNA expression in non-small cell lung cancer". Oncology Reports 38.1 (2017): 529-537.
Chicago
Zeng, Y., Zhu, J., Qin, H., Shen, D., Lei, Z., Li, W., Ding, Z., Huang, J., Liu, Z."Methylated +322-327 CpG site decreases hOGG1 mRNA expression in non-small cell lung cancer". Oncology Reports 38, no. 1 (2017): 529-537. https://doi.org/10.3892/or.2017.5690
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