Abstract
Liver-resident NK cells are distinct from conventional NK cells and play an important role in the maintenance of liver homeostasis. How liver-resident NK cells participate in autoimmune cholangitis remains unclear. Here, we extensively investigated the impact of NK cells in the pathogenesis of autoimmune cholangitis utilizing the well-established dnTGFβRII cholangitis model, NK cell-deficient (Nfil3−/−) mice, adoptive transfer and in vivo antibody-mediated NK cell depletion. Our data demonstrated that disease progression was associated with a significantly reduced frequency of hepatic NK cells. Depletion of NK cells resulted in exacerbated autoimmune cholangitis in dnTGFβRII mice. We further confirmed that the DX5−CD11chi liver-resident NK cell subset colocalized with CD4+ T cells and inhibited CD4+ T cell proliferation. Gene expression microarray analysis demonstrated that liver-resident NK cells had a distinct gene expression pattern consisting of the increased expression of genes involved in negative regulatory functions in the context of the inflammatory microenvironment.
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Acknowledgements
This study was supported by the Program for Guangdong Introducing Innovative and Entrepreneurial Teams (2017ZT07S054), the National Natural Science Foundation of China (81601416, 81430034, 91542123), the National Key R&D Program of China (2017YFA0205600) and a National Institutes of Health grant (DK090019).
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Zhao, ZB., Lu, FT., Ma, HD. et al. Liver-resident NK cells suppress autoimmune cholangitis and limit the proliferation of CD4+ T cells. Cell Mol Immunol 17, 178–189 (2020). https://doi.org/10.1038/s41423-019-0199-z
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DOI: https://doi.org/10.1038/s41423-019-0199-z
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