Frontiers in Immunology (Jun 2021)

Differential Cytokine Responses in Hospitalized COVID-19 Patients Limit Efficacy of Remdesivir

  • Yi-Hao Chan,
  • Yi-Hao Chan,
  • Barnaby E. Young,
  • Barnaby E. Young,
  • Barnaby E. Young,
  • Siew-Wai Fong,
  • Siew-Wai Fong,
  • Ying Ding,
  • Yun Shan Goh,
  • Yun Shan Goh,
  • Rhonda Sin-Ling Chee,
  • Rhonda Sin-Ling Chee,
  • Seow-Yen Tan,
  • Shirin Kalimuddin,
  • Shirin Kalimuddin,
  • Paul A. Tambyah,
  • Yee-Sin Leo,
  • Yee-Sin Leo,
  • Yee-Sin Leo,
  • Yee-Sin Leo,
  • Yee-Sin Leo,
  • Lisa F. P. Ng,
  • Lisa F. P. Ng,
  • Lisa F. P. Ng,
  • Lisa F. P. Ng,
  • David Chien Lye,
  • David Chien Lye,
  • David Chien Lye,
  • David Chien Lye,
  • Laurent Renia,
  • Laurent Renia

DOI
https://doi.org/10.3389/fimmu.2021.680188
Journal volume & issue
Vol. 12

Abstract

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A significant proportion of COVID-19 patients will progress to critical illness requiring invasive mechanical ventilation. This accentuates the need for a therapy that can reduce the severity of COVID-19. Clinical trials have shown the effectiveness of remdesivir in shortening recovery time and decreasing progression to respiratory failure and mechanical ventilation. However, some studies have highlighted its lack of efficacy in patients on high-flow oxygen and mechanical ventilation. This study uncovers some underlying immune response differences between responders and non-responders to remdesivir treatment. Immunological analyses revealed an upregulation of tissue repair factors BDNF, PDGF-BB and PIGF-1, as well as an increase in ratio of Th2-associated cytokine IL-4 to Th1-associated cytokine IFN-γ. Serological profiling of IgG subclasses corroborated this observation, with significantly higher magnitude of increase in Th2-associated IgG2 and IgG4 responses. These findings help to identify the mechanisms of immune regulation accompanying successful remdesivir treatment in severe COVID-19 patients.

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