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Kaplonek, Paulina; Cizmeci, Deniz; Kwatra, Gaurav; Izu, Alane; Lee, Jessica Shih-Lu; Bertera, Harry L; Fischinger, Stephanie; Mann, Colin; Amanat, Fatima; Wang, Wenjun; Koen, Anthonet L; Fairlie, Lee; Cutland, Clare L; Ahmed, Khatija; Dheda, Keertan; Barnabas, Shaun L; Bhorat, Qasim Ebrahim; Briner, Carmen; Krammer, Florian; Saphire, Erica Ollman; Gilbert, Sarah C; Lambe, Teresa; Pollard, Andrew J; Nunes, Marta; Wuhrer, Manfred; Lauffenburger, Douglas A; Madhi, Shabir A; Alter, Galit
Nature immunology, 07/2023, Letnik: 24, Številka: 7Journal Article
Despite the success of COVID-19 vaccines, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern have emerged that can cause breakthrough infections. Although protection against severe disease has been largely preserved, the immunological mediators of protection in humans remain undefined. We performed a substudy on the ChAdOx1 nCoV-19 (AZD1222) vaccinees enrolled in a South African clinical trial. At peak immunogenicity, before infection, no differences were observed in immunoglobulin (Ig)G1-binding antibody titers; however, the vaccine induced different Fc-receptor-binding antibodies across groups. Vaccinees who resisted COVID-19 exclusively mounted FcγR3B-binding antibodies. In contrast, enhanced IgA and IgG3, linked to enriched FcγR2B binding, was observed in individuals who experienced breakthrough. Antibodies unable to bind to FcγR3B led to immune complex clearance and resulted in inflammatory cascades. Differential antibody binding to FcγR3B was linked to Fc-glycosylation differences in SARS-CoV-2-specific antibodies. These data potentially point to specific FcγR3B-mediated antibody functional profiles as critical markers of immunity against COVID-19.
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in: SICRIS
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