Multicenter analysis of neutrophil extracellular trap dysregulation in adult and pediatric COVID-19

Carmelo Carmona-Rivera, Yu Zhang, Kerry Dobbs, Tovah E. Markowitz, Clifton L. Dalgard, Andrew J. Oler, Dillon R. Claybaugh, Deborah Draper, Meng Truong, Ottavia M. Delmonte, Francesco Licciardi, Ugo Ramenghi, Nicoletta Crescenzio, Luisa Imberti, Alessandra Sottini, Virginia Quaresima, Chiara Fiorini, Valentina Discepolo, Andrea Lo Vecchio, Alfredo GuarinoLuca Pierri, Andrea Catzola, Andrea Biondi, Paolo Bonfanti, Maria C.Poli Harlowe, Yasmin Espinosa, Camila Astudillo, Emma Rey-Jurado, Cecilia Vial, Javiera de la Cruz, Ricardo Gonzalez, Cecilia Pinera, Jacqueline W. Mays, Ashley Ng, Andrew Platt, Beth Drolet, John Moon, Edward W. Cowen, Heather Kenney, Sarah E. Weber, Riccardo Castagnoli, Mary Magliocco, Michael A. Stack, Gina Montealegre, Karyl Barron, Danielle L. Fink, Douglas B. Kuhns, Stephen M. Hewitt, Lisa M. Arkin, Daniel S. Chertow, Helen C. Su, Luigi D. Notarangelo, Mariana J. Kaplan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Dysregulation in neutrophil extracellular trap (NET) formation and degradation may play a role in the pathogenesis and severity of COVID-19; however, its role in the pediatric manifestations of this disease, including multisystem inflammatory syndrome in children (MIS-C) and chilblain-like lesions (CLLs), otherwise known as "COVID toes,"remains unclear. Studying multinational cohorts, we found that, in CLLs, NETs were significantly increased in serum and skin. There was geographic variability in the prevalence of increased NETs in MIS-C, in association with disease severity. MIS-C and CLL serum samples displayed decreased NET degradation ability, in association with C1q and G-actin or anti-NET antibodies, respectively, but not with genetic variants of DNases. In adult COVID-19, persistent elevations in NETs after disease diagnosis were detected but did not occur in asymptomatic infection. COVID-19-affected adults displayed significant prevalence of impaired NET degradation, in association with anti-DNase1L3, G-actin, and specific disease manifestations, but not with genetic variants of DNases. NETs were detected in many organs of adult patients who died from COVID-19 complications. Infection with the Omicron variant was associated with decreased NET levels when compared with other SARS-CoV-2 strains. These data support a role for NETs in the pathogenesis and severity of COVID-19 in pediatric and adult patients.

Original languageEnglish
Article numbere160332
JournalJCI Insight
Issue number16
StatePublished - 22 Aug 2022
Externally publishedYes


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