Abstract:
:Tissue transglutaminase (tTg) has been identified as an autoantigen in coeliac disease (CD). There is a marked homology between different forms of transglutaminase, such as tTg and coagulation factor XIII. We compared titres of both IgA- and IgG-antibodies against these two antigens in 20 CD patients, 20 endomysial antibody (EMA)-negative controls and a group with inflammatory bowel disease (34 with Crohn's disease and 23 with ulcerative colitis). IgA-antibodies against tTg correlated with EMA titres and had high sensitivity and specificity in screening for CD. Only in two CD patients were high titres found of IgA-antibodies against factor XIII, non-reactive with tTg. Both lacked bleeding tendency. The presence of IgG-antibodies against tTg, in contrast, had low sensitivity and specificity in screening for CD and were frequently seen in inflammatory bowel disease. Similarly, factor XIII IgG-antibodies displayed a non-specific pattern with modestly elevated titres in patients with Crohn's disease and in both EMA-negative and positive patients. Despite a marked homology with tTg, the occurrence of high titre IgA-antibodies against factor XIII is infrequent in CD, but may-when present-be the result of epitope spreading. The presence of IgG-antibodies in CD and inflammatory bowel disease illustrates the complexity of autoantibody reactions in gastrointestinal disease.
journal_name
Autoimmunityjournal_title
Autoimmunityauthors
Sjöber K,Eriksson S,Tenngart B,Roth EB,Leffler H,Stenberg Pdoi
10.1080/73-0891693021000005402subject
Has Abstractpub_date
2002-08-01 00:00:00pages
357-64issue
5eissn
0891-6934issn
1607-842Xjournal_volume
35pub_type
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