Large-scale single-cell analysis reveals critical immune characteristics of COVID-19 patients
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SUMMARY
Dysfunctional immune response in the COVID-19 patients is a recurrent theme impacting symptoms and mortality, yet the detailed understanding of pertinent immune cells is not complete. We applied single-cell RNA sequencing to 284 samples from 205 COVID-19 patients and controls to create a comprehensive immune landscape. Lymphopenia and active T and B cell responses were found to coexist and associated with age, sex and their interactions with COVID-19. Diverse epithelial and immune cell types were observed to be virus-positive and showed dramatic transcriptomic changes. Elevation of ANXA1 and S100A9 in virus-positive squamous epithelial cells may enable the initiation of neutrophil and macrophage responses via the ANXA1-FPR1 and S100A8/9-TLR4 axes. Systemic upregulation of S100A8/A9, mainly by megakaryocytes and monocytes in the peripheral blood, may contribute to the cytokine storms frequently observed in severe patients. Our data provide a rich resource for understanding the pathogenesis and designing effective therapeutic strategies for COVID-19.
HIGHLIGHTS
Large-scale scRNA-seq analysis depicts the immune landscape of COVID-19
Lymphopenia and active T and B cell responses coexist and are shaped by age and sex
SARS-CoV-2 infects diverse epithelial and immune cells, inducing distinct responses
Cytokine storms with systemic S100A8/A9 are associated with COVID-19 severity
Competing Interest Statement
The authors have declared no competing interest.
Footnotes
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