The Citrullination-Neutrophil Extracellular Trap Axis in Chronic Diseases

Overview

Journal J Innate Immun

Publisher Karger

Specialty Allergy & Immunology

Date 2022 Mar 9

PMID 35263752

Authors

Martin Maronek

Roman Gardlik

Affiliations

Soon will be listed here.

Abstract

Citrullination of proteins is crucial for the formation of neutrophil extracellular traps (NETs) - strands of nuclear DNA expulsed in the extracellular environment along with antimicrobial proteins in order to halt the spread of pathogens. Paradoxically, NETs may be immunogenic and contribute to inflammation. It is known that for the externalization of DNA, a group of enzymes called peptidyl arginine deiminases (PADs) is required. Current research often looks at citrullination, NET formation, PAD overexpression, and extracellular DNA (ecDNA) accumulation in chronic diseases as separate events. In contrast, we propose that citrullination can be viewed as the primary mechanism of autoimmunity, for instance by the formation of anti-citrullinated protein antibodies (ACPAs) but also as a process contributing to chronic inflammation. Therefore, citrullination could be at the center, connecting and impacting multiple inflammatory diseases in which ACPAs, NETs, or ecDNA have already been documented. In this review, we aimed to highlight the importance of citrullination in the etiopathogenesis of a number of chronic diseases and to explore the diagnostic, prognostic, and therapeutic potential of the citrullination-NET axis.

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