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Actin-related protein 2/3 complex subunit 2-enriched extracellular vesicles drive liver cancer metastasis

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Abstract

Background

Extracellular vesicles (EVs) play pivotal roles in tumor growth, cancer metastasis and angiogenesis. Here, we aimed to identify proteins that contribute to the functionality of EVs derived from metastatic hepatocellular carcinoma (HCC) cells.

Methods

Proteins of EVs derived from metastatic HCC cells and normal liver cells were analyzed by mass spectrometry. Proteomic profiling identified actin-related protein 2/3 complex subunit 2 (ARPC2) to be highly expressed in EVs of metastatic HCC cells. The expression of ARPC2 in EVs and HCC tissues was examined using immunoblotting and TCGA database, respectively. The functional roles of EV-ARPC2 were investigated by knockout approach and various in vitro and in vivo assays.

Results

ARPC2 was highly expressed in EVs of metastatic cells but barely detected in non-metastatic HCC cells and normal liver cells. Immunogold labeling showed the presence of APRC2 on the surface of EVs. Analysis of TCGA database of liver cancer revealed ARPC2 overexpression was correlated with poor prognosis of patients. ARPC2 was knockout in metastatic HCC cells. EVs derived from knockout cells displayed compromised activity in enhancing cell growth, motility and metastasis compared to EVs of control cells. Pimozide, an inhibitor of APRC2, also inhibited the promoting effect of EVs of metastatic cells in lung colonization of tumor cells in mice.

Conclusion

This study reveals previously unreported expression and function of ARPC2 in EVs. EVs with highly expressed ARPC2 enhance cancer cell growth and metastasis. ARPC2 may provide a prospective target for the novel treatment of HCC patients.

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Availability of data and material

The data that support the findings of this study are available from the corresponding author, upon reasonable request.

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Acknowledgements

The authors thank The University of Hong Kong, Li Ka Shing Faculty of Medicine, Centre for PanorOmic Sciences Imaging and Flow Cytometry Core for providing facility for animal imaging. The authors also thank Centre for Comparative Medicine Research for providing facility for animal experiments and the Electron Microscope Unit for providing service and support needed for experiments involving electron microscope.

Funding

The work was supported by National Natural Science Foundation of China (NSFC) General Program (Grant number: 81872340 and 82072626).

Author information

Authors and Affiliations

Authors

Contributions

PM, SKT, XM and JWPY designed the study. PM, SWKW, THN, CLSY, YX, LY, QH and PC conducted investigation and collected data. PM drafted the manuscript. JWPY, SKT and YG contributed to the critical revision of the manuscript. JWPY obtained funding. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Judy Wai Ping Yam or Yi Gao.

Ethics declarations

Conflict of interest

Piaorong Mei, Sze Keong Tey, Samuel Wan Ki Wong, Tung Him Ng, Xiaowen Mao, Cherlie Lot Sum Yeung, Yi Xu, Liang Yu, Qianhua Huang, Peihua Cao, Judy Wai Ping Yam, Yi Gao have nothing to disclose.

Ethics approval

All animal studies were approved by the Committee of the Use of Live Animals in Teaching and Research (CULATR), The University of Hong Kong. All animal work and procedures were followed strictly according to the Animals (Control of Experiments) Ordinance (Hong Kong) and the Institute’s guidance from Centre for Comparative Medical Research (CCMR), Li Ka Shing Faculty of Medicine, The University of Hong Kong.

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Mei, P., Tey, S.K., Wong, S.W.K. et al. Actin-related protein 2/3 complex subunit 2-enriched extracellular vesicles drive liver cancer metastasis. Hepatol Int 16, 603–613 (2022). https://doi.org/10.1007/s12072-022-10338-3

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  • DOI: https://doi.org/10.1007/s12072-022-10338-3

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