Early IFN-α signatures and persistent dysfunction are distinguishing features of NK cells in severe COVID-19.
Publication Title
Immunity
Document Type
Article
Publication Date
11-9-2021
Keywords
washington; seattle; swedish; isb; Base Sequence; COVID-19; Humans; Immunity, Innate; Inflammation; Interferon-alpha; Killer Cells, Natural; Pulmonary Fibrosis; RNA-Seq; SARS-CoV-2; Severity of Illness Index; Transcriptome; Tumor Necrosis Factor-alpha; United Kingdom; United States
Abstract
Longitudinal analyses of the innate immune system, including the earliest time points, are essential to understand the immunopathogenesis and clinical course of coronavirus disease (COVID-19). Here, we performed a detailed characterization of natural killer (NK) cells in 205 patients (403 samples; days 2 to 41 after symptom onset) from four independent cohorts using single-cell transcriptomics and proteomics together with functional studies. We found elevated interferon (IFN)-α plasma levels in early severe COVD-19 alongside increased NK cell expression of IFN-stimulated genes (ISGs) and genes involved in IFN-α signaling, while upregulation of tumor necrosis factor (TNF)-induced genes was observed in moderate diseases. NK cells exert anti-SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) activity but are functionally impaired in severe COVID-19. Further, NK cell dysfunction may be relevant for the development of fibrotic lung disease in severe COVID-19, as NK cells exhibited impaired anti-fibrotic activity. Our study indicates preferential IFN-α and TNF responses in severe and moderate COVID-19, respectively, and associates a prolonged IFN-α-induced NK cell response with poorer disease outcome.
Specialty/Research Institute
Infectious Diseases
Specialty/Research Institute
Institute for Systems Biology
