iScience (May 2021)

Experimental and natural evidence of SARS-CoV-2-infection-induced activation of type I interferon responses

  • Arinjay Banerjee,
  • Nader El-Sayes,
  • Patrick Budylowski,
  • Rajesh Abraham Jacob,
  • Daniel Richard,
  • Hassaan Maan,
  • Jennifer A. Aguiar,
  • Wael L. Demian,
  • Kaushal Baid,
  • Michael R. D'Agostino,
  • Jann Catherine Ang,
  • Tetyana Murdza,
  • Benjamin J.-M. Tremblay,
  • Sam Afkhami,
  • Mehran Karimzadeh,
  • Aaron T. Irving,
  • Lily Yip,
  • Mario Ostrowski,
  • Jeremy A. Hirota,
  • Robert Kozak,
  • Terence D. Capellini,
  • Matthew S. Miller,
  • Bo Wang,
  • Samira Mubareka,
  • Allison J. McGeer,
  • Andrew G. McArthur,
  • Andrew C. Doxey,
  • Karen Mossman

Journal volume & issue
Vol. 24, no. 5
p. 102477

Abstract

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Summary: Type I interferons (IFNs) are our first line of defense against virus infection. Recent studies have suggested the ability of SARS-CoV-2 proteins to inhibit IFN responses. Emerging data also suggest that timing and extent of IFN production is associated with manifestation of COVID-19 severity. In spite of progress in understanding how SARS-CoV-2 activates antiviral responses, mechanistic studies into wild-type SARS-CoV-2-mediated induction and inhibition of human type I IFN responses are scarce. Here we demonstrate that SARS-CoV-2 infection induces a type I IFN response in vitro and in moderate cases of COVID-19. In vitro stimulation of type I IFN expression and signaling in human airway epithelial cells is associated with activation of canonical transcriptions factors, and SARS-CoV-2 is unable to inhibit exogenous induction of these responses. Furthermore, we show that physiological levels of IFNα detected in patients with moderate COVID-19 is sufficient to suppress SARS-CoV-2 replication in human airway cells.

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