IL1R2⁺ Inflammatory Monocytes Contribute to Immune Dysregulation and Predict Mortality in COVID-19

Area of Science:

• Immunology
• Molecular Biology
• Genomics

Background:

• COVID-19 involves immune dysregulation and inflammation.
• Interleukin-1 receptor type 2 (IL1R2) regulates inflammation but its role in COVID-19 is unknown.

Purpose of the Study:

• To investigate the cellular distribution and clinical significance of IL1R2 in COVID-19.
• To identify IL1R2's role in COVID-19 pathogenesis and its potential as a biomarker.

Main Methods:

• Analysis of single-cell RNA sequencing data from COVID-19 patients and healthy controls.
• Evaluation of IL1R2 expression dynamics, monocyte function, and serum levels.
• Correlation of IL1R2 levels with disease severity and mortality.

Main Results:

• IL1R2 is highly expressed in monocytes of COVID-19 patients, increasing during active disease and decreasing upon recovery.
• IL1R2+ monocytes display heightened inflammatory responses and activate key inflammatory pathways.
• Elevated serum IL1R2 levels correlate with disease severity, inflammatory markers, and predict mortality.

Conclusions:

• IL1R2 marks a pro-inflammatory monocyte state linked to COVID-19 immune dysregulation.
• IL1R2 serves as a potential prognostic biomarker for COVID-19 outcomes and a therapeutic target.