Cell Reports (Jun 2023)

Proteomic analysis of circulating immune cells identifies cellular phenotypes associated with COVID-19 severity

  • Martin Potts,
  • Alice Fletcher-Etherington,
  • Katie Nightingale,
  • Federica Mescia,
  • Laura Bergamaschi,
  • Fernando J. Calero-Nieto,
  • Robin Antrobus,
  • James Williamson,
  • Harriet Parsons,
  • Edward L. Huttlin,
  • Nathalie Kingston,
  • Berthold Göttgens,
  • John R. Bradley,
  • Paul J. Lehner,
  • Nicholas J. Matheson,
  • Kenneth G.C. Smith,
  • Mark R. Wills,
  • Paul A. Lyons,
  • Michael P. Weekes

Journal volume & issue
Vol. 42, no. 6
p. 112613

Abstract

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Summary: Certain serum proteins, including C-reactive protein (CRP) and D-dimer, have prognostic value in patients with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Nonetheless, these factors are non-specific, providing limited mechanistic insight into the peripheral blood mononuclear cell (PBMC) populations that drive the pathogenesis of severe COVID-19. To identify cellular phenotypes associated with disease, we performed a comprehensive, unbiased analysis of total and plasma-membrane PBMC proteomes from 40 unvaccinated individuals with SARS-CoV-2, spanning the whole disease spectrum. Combined with RNA sequencing (RNA-seq) and flow cytometry from the same donors, we define a comprehensive multi-omic profile for each severity level, revealing that immune-cell dysregulation progresses with increasing disease. The cell-surface proteins CEACAMs1, 6, and 8, CD177, CD63, and CD89 are strongly associated with severe COVID-19, corresponding to the emergence of atypical CD3+CD4+CEACAM1/6/8+CD177+CD63+CD89+ and CD16+CEACAM1/6/8+ mononuclear cells. Utilization of these markers may facilitate real-time patient assessment by flow cytometry and identify immune populations that could be targeted to ameliorate immunopathology.

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