Abstract
Severe influenza A virus (IAV) infection is associated with immune dysfunction. Here, we show circulating CD8+ T-cell profiles from patients hospitalized with avian H7N9, seasonal IAV, and influenza vaccinees. Patient survival reflects an early, transient prevalence of highly activated CD38+HLA-DR+PD-1+ CD8+ T cells, whereas the prolonged persistence of this set is found in ultimately fatal cases. Single-cell T cell receptor (TCR)-αβ analyses of activated CD38+HLA-DR+CD8+ T cells show similar TCRαβ diversity but differential clonal expansion kinetics in surviving and fatal H7N9 patients. Delayed clonal expansion associated with an early dichotomy at a transcriptome level (as detected by single-cell RNAseq) is found in CD38+HLA-DR+CD8+ T cells from patients who succumbed to the disease, suggesting a divergent differentiation pathway of CD38+HLA-DR+CD8+ T cells from the outset during fatal disease. Our study proposes that effective expansion of cross-reactive influenza-specific TCRαβ clonotypes with appropriate transcriptome signatures is needed for early protection against severe influenza disease.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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ADP-ribosyl Cyclase 1 / genetics
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ADP-ribosyl Cyclase 1 / immunology
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CD8-Positive T-Lymphocytes / immunology*
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CD8-Positive T-Lymphocytes / pathology
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CD8-Positive T-Lymphocytes / virology
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Clonal Selection, Antigen-Mediated / genetics*
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Cohort Studies
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Critical Illness
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Gene Expression Regulation
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HLA-DR Antigens / genetics
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HLA-DR Antigens / immunology
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Hospitalization
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Humans
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Influenza A Virus, H7N9 Subtype / immunology
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Influenza A Virus, H7N9 Subtype / pathogenicity*
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Influenza, Human / genetics
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Influenza, Human / immunology*
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Influenza, Human / mortality
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Influenza, Human / virology
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Lymphocyte Activation
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Membrane Glycoproteins / genetics
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Membrane Glycoproteins / immunology
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Programmed Cell Death 1 Receptor / genetics
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Programmed Cell Death 1 Receptor / immunology
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Receptors, Antigen, T-Cell, alpha-beta / genetics
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Receptors, Antigen, T-Cell, alpha-beta / immunology*
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Survival Analysis
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T-Lymphocyte Subsets / immunology*
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T-Lymphocyte Subsets / pathology
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T-Lymphocyte Subsets / virology
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Transcriptome / immunology*
Substances
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HLA-DR Antigens
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Membrane Glycoproteins
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PDCD1 protein, human
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Programmed Cell Death 1 Receptor
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Receptors, Antigen, T-Cell, alpha-beta
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CD38 protein, human
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ADP-ribosyl Cyclase 1