Abstract
We found a HLA class II histocompatibility antigen gene, DQ alpha 1 chain (HLA-DQA1), that was expressed more than 9-fold higher in high-load hepatitis C virus (HCV) livers than low-load HCV livers using transcriptomics of chronic HCV-infected livers. To further investigate this finding, we examined which cells were positive for HLA-DQA1 and what liver immune responses were different between HCV-high and -low livers. HLA-DQA1-positive cells were significantly increased in the HCV-high group, and most positive cells were identified as non-parenchymal sinusoid cells and lymphocytic infiltrates in the portal area. Parenchymal hepatocytes were negative for HLA-DQA1. HLA-DQA1-positive cells in the liver sinusoid were positive for CD68 (macrophages or Kupffer cells); those in the lymphocytic infiltrates were positive for CD20 (B cells) or CD3 (T cells). mRNA levels of antigen-presenting cell (APC) markers such as CD68 and CD11c were significantly upregulated in the HCV-high group and were correlated with HLA-DQA mRNA levels. CD8B mRNA (CD8+ T cells) was upregulated in both HCV-positive livers compared with HCV-negative livers, whereas CD154 mRNA (CD4+ T helper cell) was upregulated in the HCV-high group compared with the HCV-low group. The immune regulatory molecules FOXP3 mRNA (regulatory T cell, T reg) and programmed cell death ligand-1 (PD-L1) mRNA were significantly increased in the HCV-high group. HCV-high livers had two molecular immune responses: increased APC numbers and adaptive immunity and the induction of immune tolerance. The local hepatic imbalance of contradictory immune responses might be responsible for high HCV loads.
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Acknowledgements
This work was supported by a grant from the “Open Research Center” Project for Private Universities: matching fund subsidy from MEXT (2005), Nihon University Joint Research Grant for 2006, Grants-in-Aid for Scientific Research (C) 22590350 (2010) and 25430142 (2013) from MEXT, and Nihon University Multidisciplinary Research Grant for 2014. The authors thank Drs. Keiko Takagi, Takuichi Oikawa, and Takao Mamiya, Nihon University Itabashi Hospital, Japan, for providing clinical data of patients.
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Ishibashi, M., Yamaguchi, H., Hirotani, Y. et al. Contradictory intrahepatic immune responses activated in high-load hepatitis C virus livers compared with low-load livers. Arch Virol 163, 855–865 (2018). https://doi.org/10.1007/s00705-017-3675-8
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DOI: https://doi.org/10.1007/s00705-017-3675-8