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Updated: May 21, 2026

Characterization of Immune Cell-derived Extracellular Vesicles and Studying Functional Impact on Cell Environment

Characterization of Immune Cell-derived Extracellular Vesicles and Studying Functional Impact on Cell Environment

Published on: June 2, 2020

Circulating extracellular vesicles drive innate immune dysregulation in MIS-C.

Tugce Canavar Yildirim¹, Yasemin Ozsurekci², Muzaffer Yildirim³

¹Vaccine Development Research Program, Dokuz Eylul University, Izmir Biomedicine and Genome Center, Izmir, Turkiye; Molecular Biology and Genetics Department, Bilkent University, Ankara, Turkiye.

The Journal of Allergy and Clinical Immunology

|May 19, 2026

Summary

Multisystem inflammatory syndrome in children (MIS-C) involves distinct immune responses and extracellular vesicles (EVs) compared to pediatric COVID-19. MIS-C features sustained antibody production, specific cytokine profiles, and unique EV characteristics, offering potential therapeutic targets.

Keywords:

IL-17A/T(H)17 IRF signaling MIS-C extracellular vesicles immunothrombosis neutrophil degranulation pediatric COVID-19 spike/RBD persistence

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Area of Science:

Immunology
Virology
Pediatrics

Background:

Multisystem inflammatory syndrome in children (MIS-C) is a severe post-SARS-CoV-2 hyperinflammatory condition affecting multiple organs.
The precise role of extracellular vesicles (EVs) in MIS-C immunopathology is not fully understood.

Purpose of the Study:

To compare humoral and cytokine responses in MIS-C patients versus pediatric COVID-19.
To investigate EV-associated viral and inflammatory signatures in MIS-C and pediatric COVID-19.

Main Methods:

Prospective cohort study classifying patients with PCR-confirmed SARS-CoV-2 infection into asymptomatic, mild/moderate, severe COVID-19, or MIS-C groups.
Longitudinal quantification of anti-SARS-CoV-2 antibodies (Spike, RBD, nucleocapsid) using ELISA.
Measurement of 19 cytokines via multiplex bead assays and plasma EV analysis (isolation, characterization, Spike/RBD detection, reporter cell activation, proteomics).

Main Results:

MIS-C patients exhibited higher and sustained anti-Spike/RBD IgG responses, indicating prolonged antigen exposure.
MIS-C displayed a unique inflammatory profile with elevated IL-17A and IL-22 compared to severe COVID-19.
Extracellular vesicles (EVs) from MIS-C patients showed preferential IRF pathway activation and a distinct proteomic cargo enriched in innate immune pathways and neutrophil degranulation markers.

Conclusions:

MIS-C is characterized by sustained humoral immunity, Th17-skewed cytokines, and antigen-bearing EVs with specific immunostimulatory and proteomic profiles.
Profiling of EVs and associated pathways (IL-17, adhesion/integrin networks) holds promise for developing MIS-C biomarkers and targeted immunomodulatory therapies.