Content » Vol 94, Issue 4

Investigative Report

Small Bowel Transglutaminase 2-specific IgA Deposits in Dermatitis Herpetiformis

Teea T. Salmi, Kaisa Hervonen, Kaija Laurila, Pekka Collin, Markku Mäki, Outi Koskinen, Heini Huhtala, Katri Kaukinen, Timo Reunala
DOI: 10.2340/00015555-1764


Dermatitis herpetiformis (DH) is an extraintestinal manifestation of coeliac disease. Untreated coeliac disease patients are known to have transglutaminase 2 (TG2)-targeted IgA deposits in the small bowel mucosa. To evaluate whether similar intestinal IgA deposits are also present in DH and whether the deposits disappear with gluten-free diet, 47 untreated and 27 treated DH patients were studied. Seventy-nine percent of untreated and 41% of the treated DH patients had TG2-specific IgA deposits in the small bowel, and the presence of the deposits showed a significant association with the degree of small bowel villous atrophy (p < 0.001). Other coeliac-disease related inflammatory markers were also investigated, and the density of small bowel mucosal intraepithelial γδ+ T cells was increased in 91% of untreated and 73% of treated DH patients. The results show that the majority of untreated DH patients have similar gluten-dependent TG2-specific IgA deposits the small bowel mucosa as coeliac disease patients.


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