iScience (Mar 2023)

Tocilizumab-treated convalescent COVID-19 patients retain the cross-neutralization potential against SARS-CoV-2 variants

  • Camille Chauvin,
  • Laurine Levillayer,
  • Mathilde Roumier,
  • Hubert Nielly,
  • Claude Roth,
  • Anupama Karnam,
  • Srinivasa Reddy Bonam,
  • Anne Bourgarit,
  • Clément Dubost,
  • Aurore Bousquet,
  • Sébastien Le Burel,
  • Raphaële Mestiri,
  • Damien Sene,
  • Joris Galland,
  • Marc Vasse,
  • Matthieu Groh,
  • Mathilde Le Marchand,
  • Camille Vassord-Dang,
  • Jean-François Gautier,
  • Nhan Pham-Thi,
  • Christiane Verny,
  • Bruno Pitard,
  • Cyril Planchais,
  • Hugo Mouquet,
  • Richard Paul,
  • Etienne Simon-Loriere,
  • Jagadeesh Bayry,
  • Laurent Gilardin,
  • Anavaj Sakuntabhai

Journal volume & issue
Vol. 26, no. 3
p. 106124

Abstract

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Summary: Although tocilizumab treatment in severe and critical coronavirus disease 2019 (COVID-19) patients has proven its efficacy at the clinical level, there is little evidence supporting the effect of short-term use of interleukin-6 receptor blocking therapy on the B cell sub-populations and the cross-neutralization of SARS-CoV-2 variants in convalescent COVID-19 patients. We performed immunological profiling of 69 tocilizumab-treated and non-treated convalescent COVID-19 patients in total. We observed that SARS-CoV-2-specific IgG1 titers depended on disease severity but not on tocilizumab treatment. The plasma of both treated and non-treated patients infected with the ancestral variant exhibit strong neutralizing activity against the ancestral virus and the Alpha, Beta, and Delta variants of SARS-CoV-2, whereas the Gamma and Omicron viruses were less sensitive to seroneutralization. Overall, we observed that, despite the clinical benefits of short-term tocilizumab therapy in modifying the cytokine storm associated with COVID-19 infections, there were no modifications in the robustness of B cell and IgG responses to Spike antigens.

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