Abstract
The liver is an immunologically tolerant organ and a common metastatic site of multiple cancer types. Although a role for cancer cell invasion programs has been well characterized, whether and how liver-intrinsic factors drive metastatic spread is incompletely understood. Here, we show that aberrantly activated hepatocyte-intrinsic cell cycle-related kinase (CCRK) signaling in chronic liver diseases is critical for cancer metastasis by reprogramming an immunosuppressive microenvironment. Using an inducible liver-specific transgenic model, we found that CCRK overexpression dramatically increased both B16F10 melanoma and MC38 colorectal cancer (CRC) metastasis to the liver, which was highly infiltrated by polymorphonuclear-myeloid-derived suppressor cells (PMN-MDSCs) and lacking natural killer T (NKT) cells. Depletion of PMN-MDSCs in CCRK transgenic mice restored NKT cell levels and their interferon gamma production and reduced liver metastasis to 2.7% and 0.7% (metastatic tumor weights) in the melanoma and CRC models, respectively. Mechanistically, CCRK activated nuclear factor-kappa B (NF-κB) signaling to increase the PMN-MDSC-trafficking chemokine C-X-C motif ligand 1 (CXCL1), which was positively correlated with liver-infiltrating PMN-MDSC levels in CCRK transgenic mice. Accordingly, CRC liver metastasis patients exhibited hyperactivation of hepatic CCRK/NF-κB/CXCL1 signaling, which was associated with accumulation of PMN-MDSCs and paucity of NKT cells compared to healthy liver transplantation donors. In summary, this study demonstrates that immunosuppressive reprogramming by hepatic CCRK signaling undermines antimetastatic immunosurveillance. Our findings offer new mechanistic insights and therapeutic targets for liver metastasis intervention.
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Acknowledgements
We acknowledge Prof. Andrew M.L. Chan for his kind gift of the B16F10 melanoma cell line. This project is supported by the University Grants Committee through the Collaborative Research Fund (C4045-18W), Theme-based Research Scheme (T11-706/18-N), General Research Fund (14108219, 14105419), the Li Ka Shing Foundation and the Terry Fox Foundation.
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Study concept and design: X.Z., J.Z., and A.S.L.C.; acquisition of data: X.Z., Z.X., H.S., W.Y., M.T.S.M., J.W., J.L., M.L., W.T., Y.F., H.K.S.W., S.W.T., and K.L.C.; analysis and interpretation of the data: X.Z., J.Z., and A.S.L.C.; acquisition of patient specimens: H.S., P.C.Y., J.W., P.B.S.L., A.W.H.C., K.F.T., and Q.X.; drafting of the manuscript: X.Z., J.Z., and A.S.L.C.; critical revision of the manuscript: J.Z., K.L.C., A.W.H.C., K.F.T., S.L.C., J.X., X.C., J.Y., S.P., J.J.Y.S., M.K., and A.S.L.C.; obtained funding: J.Z., J.J.Y.S., M.K., and A.S.L.C.; and study supervision: J.Z. and A.S.L.C.
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Zeng, X., Zhou, J., Xiong, Z. et al. Cell cycle-related kinase reprograms the liver immune microenvironment to promote cancer metastasis. Cell Mol Immunol 18, 1005–1015 (2021). https://doi.org/10.1038/s41423-020-00534-2
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DOI: https://doi.org/10.1038/s41423-020-00534-2
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