Complement activation induces excessive T cell cytotoxicity in severe COVID-19.

ABSTRACT: Severe COVID-19 is linked to both dysfunctional immune response and unrestrained immunopathology, and it remains unclear whether T cells contribute to disease pathology. Here, we combined single-cell transcriptomics and single-cell proteomics with mechanistic studies to assess pathogenic T cell functions and inducing signals. We identified highly activated CD16⁺ T cells with increased cytotoxic functions in severe COVID-19. CD16 expression enabled immune-complex-mediated, T cell receptor-independent degranulation and cytotoxicity not found in other diseases. CD16⁺ T cells from COVID-19 patients promoted microvascular endothelial cell injury and release of neutrophil and monocyte chemoattractants. CD16⁺ T cell clones persisted beyond acute disease maintainin

SUBMITTER: Georg P 

PROVIDER: S-EPMC8712270 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature