Association between serum markers for celiac and thyroid autoimmune diseases

Francisco M. de Melo Maria S.M. Cavalcanti Severino B. dos Santos Ana K.B.F. Lopes Felipe A.A. de Oliveira About the authors

Celiac disease (CD) is an autoimmune disease of the small bowel characterized by a strong genetic association with HLA - DQ2 and DQ8. Gluten is the etiological factor and the tissue enzyme transglutaminase (TGase) is its autoantigen. CD is associated with several autoimmune diseases such as type 1 diabetes, systemic lupus erythematous, rheumatoid arthritis, Sjögren’s syndrome and autoimmune thyroid diseases. The aim of this study was to investigate the occurrence of serum IgA anti-endomysial and anti-human TGase antibodies in individuals with positive anti-thyroid antibody (ATA). The concordance between these two tests was also evaluated. Anti-endomysial antibodies were positive in 10 out of 456 (2.2%) and anti-human TGase were positive in 14 of 454 (3.1%) individuals with positive ATA. In control subjects they were positive in 1 of 197 (0.5%) and 2 of 198 (1%) for anti-endomysial and anti-human tissue TGase antibodies, respectively. The odds ratio (OR) for the anti-endomysial antibodies was 4.42 and for the anti-human TGase 3.12 in individuals with ATA when compared with controls. An elevated concordance index (k= 0.84) was observed between anti-endomisyal antibodies and anti-human TGase. We conclude that the determination of anti-TGase antibodies is a good test for DC screening.

Celiac disease; Thyroid autoimmune disease; Serum markers; Human tissue transglutaminase

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