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Proinflammatory IgG Fc structures in patients with severe COVID-19
Journal article   Peer reviewed

Proinflammatory IgG Fc structures in patients with severe COVID-19

Saborni Chakraborty, Joseph Gonzalez, Karlie Edwards, Vamsee Mallajosyula, Anthony S. Buzzanco, Robert Sherwood, Cindy Buffone, Nimish Kathale, Susan Providenza, Markus M. Xie, …
Nature immunology, Vol.22(1), pp.67-73
01/01/2021
DOI: 10.1038/s41590-020-00828-7
PMID: 33169014
url
https://doi.org/10.1038/s41590-020-00828-7View
Published (Version of record) Open Access

Abstract

COVID-19 is often characterized by a hyperinflammatory syndrome. Wang and colleagues show that low levels of IgG fucosylation enhance interactions with activating Fc gamma receptors, boosting the inflammatory cytokines associated with severe COVID-19. Severe acute respiratory syndrome coronavirus 2 infections can cause coronavirus disease 2019 (COVID-19), which manifests with a range of severities from mild illness to life-threatening pneumonia and multi-organ failure. Severe COVID-19 is characterized by an inflammatory signature, including high levels of inflammatory cytokines, alveolar inflammatory infiltrates and vascular microthrombi. Here we show that patients with severe COVID-19 produced a unique serologic signature, including an increased likelihood of IgG1 with afucosylated Fc glycans. This Fc modification on severe acute respiratory syndrome coronavirus 2 IgGs enhanced interactions with the activating Fc gamma receptor Fc gamma RIIIa; when incorporated into immune complexes, Fc afucosylation enhanced production of inflammatory cytokines by monocytes, including interleukin-6 and tumor necrosis factor. These results show that disease severity in COVID-19 correlates with the presence of proinflammatory IgG Fc structures, including afucosylated IgG1.
Immunology Life Sciences & Biomedicine Science & Technology

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