Coeliac disease and rheumatoid arthritis: similar mechanisms, different antigens

Area of Science:

• Immunology
• Genetics
• Rheumatology

Background:

• Rheumatoid arthritis (RA) and coeliac disease are inflammatory conditions linked to specific Human Leukocyte Antigen (HLA) class II alleles.
• RA risk is associated with HLA-DR shared epitope alleles, while coeliac disease risk is linked to HLA-DQ2.5 and HLA-DQ8 alleles.
• Both diseases involve immune responses to post-translationally modified protein antigens.

Purpose of the Study:

• To review advances in understanding the pathogenesis of RA and coeliac disease.
• To draw parallels between the immune mechanisms underlying RA and coeliac disease.
• To describe therapeutic strategies aimed at re-establishing immune tolerance.

Main Methods:

• Review of current research on HLA associations and immune responses in RA and coeliac disease.
• Comparative analysis of pathogenetic mechanisms, focusing on T-cell and B-cell responses.
• Discussion of emerging therapeutic approaches targeting immune tolerance.

Main Results:

• Growing understanding of B-cell responses to citrullinated antigens (e.g., vimentin, fibrinogen, α-enolase) in RA pathogenesis.
• Identification of T-cell responses to deamidated gluten antigens presented by HLA-DQ2.5 in coeliac disease.
• Evidence suggests a critical role for T-cell-B-cell cooperation in disease development for both conditions.

Conclusions:

• RA and coeliac disease share fundamental immune pathways involving HLA class II molecules and modified antigens.
• Therapeutic strategies focusing on re-establishing immune tolerance are being developed based on these insights.
• Further research into these shared mechanisms holds promise for novel treatments.