Autoantibody signatures in children with celiac disease, juvenile idiopathic arthritis, and polyautoimmunity

Area of Science:

• Immunology
• Pediatrics
• Biomarker Discovery

Background:

• Autoimmune diseases are common in children.
• Identifying novel biomarkers for polyautoimmunity is crucial for early diagnosis and management.
• Multiplex autoantibody arrays offer a high-throughput approach to screen for multiple autoantibodies simultaneously.

Purpose of the Study:

• To investigate the utility of multiplex autoantibody arrays in identifying novel biomarker signatures in children with autoimmune diseases, particularly polyautoimmunity.
• To compare autoantibody profiles between children with single autoimmune diseases and those with polyautoimmunity.

Main Methods:

• Plasma samples from 114 children (≤18 years) were analyzed using a microarray detecting 120 autoantigens.
• Immunoglobulin G (IgG) and Immunoglobulin A (IgA) autoantibodies were assessed.
• Patients were classified into groups: celiac disease (CeD), juvenile idiopathic arthritis, polyautoimmunity, and controls.

Main Results:

• Children with polyautoimmunity exhibited higher levels of specific autoantibodies compared to other groups.
• Elevated H/K ATPase IgA and IgG, and MDA5 IgG were observed in children with both CeD and polyautoimmunity compared to CeD alone.
• The study identified distinct autoantibody profiles associated with polyautoimmunity.

Conclusions:

• Multiplex autoantibody arrays are valuable tools for identifying known and potentially novel disease-antigens in pediatric autoimmune diseases.
• Further research is needed to explore the role of H/K ATPase autoantibodies in monitoring celiac disease patients.
• This approach can aid in understanding the complex immunopathology of polyautoimmunity in children.