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Increased Neutrophil Extracellular Trap Formation in Oligoarticular, Polyarticular Juvenile Idiopathic Arthritis and Enthesitis-related Arthritis: Biomarkers for Diagnosis and Disease Activity

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Journal Front Immunol
Date 2024 Aug 26
PMID 39185410
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Abstract

Objective: Neutrophil extracellular traps (NETs) are important factors in initiating and perpetuating inflammation. However, the role of NETs in different subtypes of juvenile idiopathic arthritis (JIA) has been rarely studied. Therefore, we aimed to explore the ability of JIA-derived neutrophils to release NETs and the effect of TNF-α (tumor necrosis factor-alpha) inhibitors on NET formation both and , and evaluate the associations of NET-derived products with clinical and immune-related parameters.

Methods: The ability of neutrophils to release NETs and the effect of adalimumab on NET formation was assessed via stimulation and inhibition studies. Plasma NET-derived products were detected to assess the incidence of NET formation . Furthermore, flow cytometry and western blotting were used to detect NET-associated signaling components in neutrophils.

Results: Compared to those derived from HCs, neutrophils derived from patients with oligoarticular-JIA, polyarticular-JIA and enthesitis-related arthritis were more prone to generate NETs spontaneously and in response to TNF-α or PMA . Excessive NET formation existed in peripheral circulation of JIA patients, and elevated plasma levels of NET-derived products (cell-free DNA and MPO-DNA complexes) could accurately distinguish JIA patients from HCs and were positively correlated with disease activity. Multiple linear regression analysis showed that erythrocyte sedimentation rate and TNF-α levels were independent variables and were positively correlated with cell-free DNA concentration. Notably, TNF-α inhibitors could effectively prevent NET formation both and . Moreover, the phosphorylation levels of NET-associated kinases in JIA-derived neutrophils were markedly increased.

Conclusion: Our data suggest that NETs might play pathogenic roles and may be involved in TNF-α-mediated inflammation in JIA. Circulating NET-derived products possess potential diagnostic and disease monitoring value. Furthermore, the preliminary results related to the molecular mechanisms of NET formation in JIA patients provide a theoretical basis for NET-targeted therapy.

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