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CircTFF1 Promotes Proliferation, Migration and Invasion of Lung Cancer Cells by Facilitating Methylation of BCL6B Promoter via miR-29c-3p/DNMT3A Axis

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Abstract

Lung cancer exists as a major risk of cancer-related death worldwide. As a novel circular RNA (circRNA), circTFF1 has not been explored in lung cancer thoroughly. This study aims to probe into the function and mechanism of circTFF1 in lung cancer. RT-qPCR and western blot were used to detect expression of RNAs and proteins. The influence of circTFF1 and BCL6B on cells behavior was explored via CCK-8 assay, colony formation assay, wound healing assay and transwell assay. Methylation of BCL6B was detected via MSP assay. Bioinformatics analysis and mechanism assays were conducted for investigating the interaction among genes. CircTFF1 was found to be upregulated in lung cancer cell lines used in this study. Functional experiments revealed circTFF1 facilitated cell proliferation, migration and invasion. BCL6B was downregulated in lung cancer cell lines used in this study, and the downregulation of BCL6B was mainly mediated by methylation. Additionally, BCL6B exerted suppressive impacts on lung cancer cell line malignant behavior. Moreover, circTFF1 acted as the miR-29c-3p sponge to upregulate DNMT3A, which facilitated the methylation of BCL6B. In all, circTFF1 promoted proliferation, migration and invasion of lung cancer cell lines by facilitating methylation of BCL6B promoter via miR-29c-3p/DNMT3A axis.

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Acknowledgements

We appreciate the supports of all laboratory staff.

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Authors and Affiliations

  1. Department of Thoracic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, 215006, Jiangsu, China

    Lantao Zhao, Peng Li & Bin Ni

  2. Department of Thoracic Surgery, The Second People’s Hospital of Lianyungang City, Lianyungang, 222002, Jiangsu, China

    Lantao Zhao, Liang Wang & Yonghong Wang

  3. Department of Thoracic Surgery, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, 215008, Jiangsu, China

    Hongya Xie

  4. Department of Thoracic Surgery, The Affiliated Haian Hospital of Nantong University, Nantong, 226699, Jiangsu, China

    Haisheng Chen

  5. Department of Thoracic Surgery, Wuzhong People’s Hospital of Suzhou City, Suzhou, 215128, Jiangsu, China

    Jiang He

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  1. Lantao Zhao
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Correspondence to Bin Ni.

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12033_2022_594_MOESM1_ESM.tif

Fig. S1 Online prediction of target genes. (A) Potential downstream miRNAs of circTFF1 were predicted via starBase. (B) Potential downstream mRNAs of miR-29c-3p were predicated via miRDB. Supplementary file1 (TIF 29746 kb)

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Zhao, L., Xie, H., Li, P. et al. CircTFF1 Promotes Proliferation, Migration and Invasion of Lung Cancer Cells by Facilitating Methylation of BCL6B Promoter via miR-29c-3p/DNMT3A Axis. Mol Biotechnol 65, 942–952 (2023). https://doi.org/10.1007/s12033-022-00594-x

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  • DOI: https://doi.org/10.1007/s12033-022-00594-x

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