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YTHDF2 promotes the liver cancer stem cell phenotype and cancer metastasis by regulating OCT4 expression via m6A RNA methylation

Oncogene volume 39, pages 4507–4518 (2020)Cite this article

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Abstract

N6-methyladenosine (m6A) RNA methylation contributes to the cancer stem cell (CSC) phenotype through regulating gene expression. YTHDF2, an m6A reader, was shown to be associated with hepatocellular carcinoma (HCC) patient prognosis. However, the effect of YTHDF2 on liver CSC and cancer metastasis and the molecular mechanism of this effect have not been documented. Here, we show that YTHDF2 expression is negatively correlated with HCC patient survival in both data from the Cancer Genome Atlas (TCGA) database and clinical data from our center. By detecting CD133+ cells and carrying out sphere culture assays, we found that knockdown of YTHDF2 led to impaired stemness in Hep3B and Huh7 cells. In contrast, overexpression of YTHDF2 increased the CSC phenotype. Mechanistically, the knockdown and overexpression of YTHDF2 in liver cancer cells resulted in decreased and increased m6A levels in the 5′-untranslated region (UTR) of OCT4 mRNA, respectively, leading to decreased and increased OCT4 protein expression, respectively. A luciferase activity assay showed that mutation of the corresponding m6A methylation sequence in the 5′-UTR of OCT4 mRNA caused significantly decreased gene expression, suggesting a role for YTHDF2-dependent m6A methylation in protein translation. Polysome profiling results also indicated the knockdown and overexpression of YTHDF2 could decrease and increase OCT4 translation, respectively. In particular, overexpression of OCT4 rescued the impaired stemness caused by YTHDF2 depletion, which confirmed the effect of YTHDF2 on CSC phenotype is dependent on OCT4. In vivo, the loss of YTHDF2 reduced tumor burden and inhibited lung metastasis following orthotopic transplantation in nude mice. Last, we demonstrated that YTHDF2 expression is positively correlated with OCT4 expression and m6A levels in the 5′-UTR of OCT4 mRNA in clinical HCC specimens. In conclusion, YTHDF2 promotes the CSC liver phenotype and cancer metastasis by modulating the m6A methylation of OCT4 mRNA.

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Fig. 1: YTHDF2 expression is associated with patients’ survival.
Fig. 2: YTHDF2 is required for liver cancer stem cell phenotype.
Fig. 3: Loss of YTHDF2 decreases OCT4 protein level but not mRNA level.
Fig. 4: YTHDF2 is required for OCT4 mRNA m6A methylation and protein translation.
Fig. 5: Polysome profiling identifies the effect of YTHDF2 on OCT4 translation.
Fig. 6: YTHDF2 overexpression promotes liver cancer stem cell phenotype.
Fig. 7: Knockdown of YTHDF2 decreases tumor burden in orthotopic liver tumors and inhibits lung metastasis.

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Funding

This study was supported by the National Natural Science Foundation of China (project Nos.: 81702783 and 81672475), the Natural Science Foundation of Guangdong Province (project No.: 2017A030310574), and Guangdong Medical Science and Technology Research Fund (A2019494 and A2019252).

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  1. These authors contributed equally: Chuanzhao Zhang, Shanzhou Huang

Authors and Affiliations

  1. Department of General Surgery, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, School of Medicine, South China University of Technology, Guangzhou, 510080, China

    Chuanzhao Zhang, Shanzhou Huang, Hongkai Zhuang, Shiye Ruan, Zixuan Zhou, Kaijun Huang, Fei Ji, Zuyi Ma & Baohua Hou

  2. Shantou University of Medical College, Shantou, 515000, Guangdong Province, China

    Hongkai Zhuang & Zuyi Ma

  3. Organ Transplant Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080, China

    Xiaoshun He

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Zhang, C., Huang, S., Zhuang, H. et al. YTHDF2 promotes the liver cancer stem cell phenotype and cancer metastasis by regulating OCT4 expression via m6A RNA methylation. Oncogene 39, 4507–4518 (2020). https://doi.org/10.1038/s41388-020-1303-7

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