Abstract
Patients with severe COVID-19 develop acute respiratory distress syndrome (ARDS) that may progress to cytokine storm syndrome, organ dysfunction, and death. Considering that complement component 5a (C5a), through its cellular receptor C5aR1, has potent proinflammatory actions and plays immunopathological roles in inflammatory diseases, we investigated whether the C5a/C5aR1 pathway could be involved in COVID-19 pathophysiology. C5a/C5aR1 signaling increased locally in the lung, especially in neutrophils of critically ill patients with COVID-19 compared with patients with influenza infection, as well as in the lung tissue of K18-hACE2 Tg mice (Tg mice) infected with SARS-CoV-2. Genetic and pharmacological inhibition of C5aR1 signaling ameliorated lung immunopathology in Tg-infected mice. Mechanistically, we found that C5aR1 signaling drives neutrophil extracellular traps-dependent (NETs-dependent) immunopathology. These data confirm the immunopathological role of C5a/C5aR1 signaling in COVID-19 and indicate that antagonists of C5aR1 could be useful for COVID-19 treatment.
| Original language | English |
|---|---|
| Article number | e163105 |
| Journal | Journal of Clinical Investigation |
| Volume | 133 |
| Issue number | 12 |
| ISSN | 0021-9738 |
| DOIs | |
| Publication status | Published - 15.06.2023 |
Funding
The authors gratefully acknowledge the technical assistance of Ieda R. Schivo, Ana Katia dos Santos, Jenna M. Turner, Sergio R. Rosa, Diva A. Sousa, Eleni Tamburus, Marcella Daruge Grando, Soraya Jabur, Felipe Souza, and Andreia Nogueira. The research leading to these results received funding from a research grant from Dompé Farmaceutici s.p.a (USP/Dompé Farmaceutici s.p.a agreement), KU Leuven (C1 grant C16/17/010), and the São Paulo Research Foundation (FAPESP) under grant agreements no. 2020/04860-8 (COVID-19 project) and 2013/08216-2 (Center for Research in Inflammatory Disease), and a joint grant between FAPESP and Research Foundation Flanders (FWO Vlaanderen) (grant G0F7519N - 18/10990-1). SC is supported by a PhD fellowship from FWO-Vlaanderen.
Research Areas and Centers
- Academic Focus: Center for Infection and Inflammation Research (ZIEL)
DFG Research Classification Scheme
- 2.21-05 Immunology
- 2.22-22 Clinical Immunology and Allergology
Coronavirus related work
- Research on SARS-CoV-2 / COVID-19