Abstract
Background
Portal vein tumour thrombus (PVTT) is the main pathway of HCC intrahepatic metastasis and is responsible for the poor prognosis of patients with HCC. However, the molecular mechanisms underlying PVTT vascular metastases have not been fully elucidated.
Methods
NDRG1 expression was assessed by immunohistochemistry and immunoblotting in clinical specimens obtained from curative surgery. The functional relevance of NDRG1 was evaluated using sphere formation and animal models of tumorigenicity and metastasis. The relationship between NDRG1 and EpCAM was explored using molecular biological techniques.
Results
NDRG1 protein was upregulated in HCC samples compared to non-tumorous tissues. Furthermore, NDRG1 expression was enhanced in the PVTT samples. Our functional study showed that NDRG1 was required for the self-renewal of tumour-initiating/cancer stem cells (CSCs). In addition, NDRG1 knockdown inhibited the proliferation and migration of PVTT-1 cells in vitro and in vivo. NDRG1 was found to stabilise the functional tumour-initiating cell marker EpCAM through protein–protein interactions and inhibition of EpCAM ubiquitination.
Conclusion
Our findings suggest that NDRG1 enhances CSCs expansion, PVTT formation and growth capability through the regulation of EpCAM stability. NDRG1 may be a promising target for the treatment of patients with HCC and PVTT.
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Data availability
All results presented in the article are available upon request from the corresponding author.
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Acknowledgements
We would like to thank the Prof. Hongyang Wang (Shanghai Eastern Hepatobiliary Surgery Hospital) for providing technical support.
Funding
This work was supported by National Natural Science Foundation of China (81502581, 82172693, 81872508) and the China Postdoctoral Science Foundation (2022M711911).
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QC and JZ designed the work and provided material support. QC and SN acquired the main data. LZ performed several molecular biology experiments. CZ and SJ performed several cell experiments. YH provided bioinformatics analysis. QC, LZ and SN drafted the manuscript. JZ revised the manuscript.
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The experiments involved in clinical specimens were performed in accordance with the Declaration of Helsinki and were approved by the Research Ethics Committee of Peking University People’s Hospital. Informed consent was obtained from all participants. In addition, the animal studies were approved by the Institutional Animal Welfare and Ethics Committee of Peking University People’s Hospital.
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Cheng, Q., Ning, S., Zhu, L. et al. NDRG1 facilitates self-renewal of liver cancer stem cells by preventing EpCAM ubiquitination. Br J Cancer 129, 237–248 (2023). https://doi.org/10.1038/s41416-023-02278-y
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DOI: https://doi.org/10.1038/s41416-023-02278-y