IgA Subclasses and Free Light Chains in Celiac Disease: A Pilot Study

Area of Science:

• Immunology
• Gastroenterology

Background:

• Celiac disease (CD) is an autoimmune enteropathy triggered by gliadin in genetically susceptible individuals.
• The immune response in CD is characterized by IgA-driven inflammation, but IgA subclasses (IgA1, IgA2) and free light chains (FLCs) roles are unclear.

Purpose of the Study:

• To characterize IgA subclasses and FLC profiles in newly diagnosed celiac patients.
• To explore potential biomarkers for immune dysregulation in CD.

Main Methods:

• Sera from 108 CD patients and 29 controls were analyzed.
• Assessed conventional serological markers, total IgA, IgA1, IgA2, and FLCs using turbidimetric methods.

Main Results:

• CD patients showed higher total IgA and an increased IgA1/IgA2 ratio.
• A decreased kappa/lambda (k/λ) ratio was observed in CD patients.
• Combined biomarkers yielded an AUC of 0.827, indicating complementary diagnostic information.

Conclusions:

• Findings suggest a reorganization of the IgA compartment in CD, with IgA1 expansion and preferential lambda light chain usage.
• These alterations highlight coordinated changes in the humoral immune response in celiac disease.
• Further validation in larger cohorts is needed; these markers may refine CD characterization.