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Exploratory analysis of interleukin‐38 in hospitalized COVID‐19 patients
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Exploratory analysis of interleukin‐38 in hospitalized COVID‐19 patients
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Exploratory analysis of interleukin‐38 in hospitalized COVID‐19 patients
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Journal Article
Exploratory analysis of interleukin‐38 in hospitalized COVID‐19 patients
2022
Overview
Introduction
A major contributor to coronavirus disease 2019 (COVID‐19) progression and severity is a dysregulated innate and adaptive immune response. Interleukin‐38 (IL−38) is an IL‐1 family member with broad anti‐inflammatory properties, but thus far little is known about its role in viral infections. Recent studies have shown inconsistent results, as one study finding an increase in circulating IL‐38 in COVID‐19 patients in comparison to healthy controls, whereas two other studies report no differences in IL‐38 concentrations.
Methods
Here, we present an exploratory, retrospective cohort study of circulating IL‐38 concentrations in hospitalized COVID‐19 patients admitted to two Dutch hospitals (discovery n = 148 and validation n = 184) and age‐ and sex‐matched healthy subjects. Plasma IL‐38 concentrations were measured by enzyme‐linked immunosorbent assay, disease‐related proteins by proximity extension assay, and clinical data were retrieved from hospital records.
Results
IL‐38 concentrations were stable during hospitalization and similar to those of healthy control subjects. IL‐38 was not associated with rates of intensive care unit admission or mortality. Only in men in the discovery cohort, IL‐38 concentrations were positively correlated with hospitalization duration. A positive correlation between IL‐38 and the inflammatory biomarker d‐dimer was observed in men of the validation cohort. In women of the validation cohort, IL‐38 concentrations correlated negatively with thrombocyte numbers. Furthermore, plasma IL‐38 concentrations in the validation cohort correlated positively with TNF, TNFRSF9, IL‐10Ra, neurotrophil 3, polymeric immunoglobulin receptor, CHL1, CD244, superoxide dismutase 2, and fatty acid binding protein 2, and negatively with SERPINA12 and cartilage oligomeric matrix protein.
Conclusions
These data indicate that IL‐38 is not associated with disease outcomes in hospitalized COVID‐19 patients. However, moderate correlations between IL‐38 concentrations and biomarkers of disease were identified in one of two cohorts. While we demonstrate that IL‐38 concentrations are not indicative of COVID‐19 severity, its anti‐inflammatory effects may reduce COVID‐19 severity and should be experimentally investigated.
A major contributor to coronavirus disease 2019 (COVID‐19) progression and severity is a dysregulated innate and adaptive immune response. Interleukin (IL‐38) is an IL‐1 family member with broad anti‐inflammatory properties, but thus far little is known about its role in viral infections. Here, we demonstrate that IL 38 concentrations are not indicative of COVID‐19 severity in hospitalized patients
