Abstract
The role of adaptive immunity in early cancer development is controversial. Here we show that chronic inflammation and fibrosis in humans and mice with non-alcoholic fatty liver disease is accompanied by accumulation of liver-resident immunoglobulin-A-producing (IgA+) cells. These cells also express programmed death ligand 1 (PD-L1) and interleukin-10, and directly suppress liver cytotoxic CD8+ T lymphocytes, which prevent emergence of hepatocellular carcinoma and express a limited repertoire of T-cell receptors against tumour-associated antigens. Whereas CD8+ T-cell ablation accelerates hepatocellular carcinoma, genetic or pharmacological interference with IgA+ cell generation attenuates liver carcinogenesis and induces cytotoxic T-lymphocyte-mediated regression of established hepatocellular carcinoma. These findings establish the importance of inflammation-induced suppression of cytotoxic CD8+ T-lymphocyte activation as a tumour-promoting mechanism.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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B7-H1 Antigen / metabolism
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CD8 Antigens / deficiency
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Carcinoma, Hepatocellular / etiology
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Carcinoma, Hepatocellular / immunology*
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Carcinoma, Hepatocellular / pathology
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Cell Proliferation
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Clone Cells / cytology
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Clone Cells / immunology
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Disease Progression
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Female
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Gastrointestinal Microbiome
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Humans
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Immune Tolerance / immunology*
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Immunoglobulin A / immunology*
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Immunoglobulin A / metabolism
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Inflammation / etiology
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Inflammation / immunology*
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Inflammation / pathology
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Interleukin-10 / metabolism
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Liver Cirrhosis / complications
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Liver Cirrhosis / immunology
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Liver Cirrhosis / metabolism
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Liver Cirrhosis / pathology
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Liver Neoplasms / etiology
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Liver Neoplasms / immunology*
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Liver Neoplasms / pathology
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Lymphocyte Activation
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Male
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Mice
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Non-alcoholic Fatty Liver Disease / complications*
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Non-alcoholic Fatty Liver Disease / immunology*
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Non-alcoholic Fatty Liver Disease / metabolism
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Non-alcoholic Fatty Liver Disease / pathology
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Plasma Cells / immunology
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Plasma Cells / metabolism
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T-Lymphocytes, Cytotoxic / cytology
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T-Lymphocytes, Cytotoxic / immunology
Substances
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B7-H1 Antigen
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CD8 Antigens
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CD8 antigen, alpha chain
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Immunoglobulin A
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Interleukin-10