Abstract:
:Coeliac disease (CD) is becoming a model for understanding the pathogenesis of autoimmune disorders. In CD, antibodies against transglutaminase 2 (TG2) and specific residues of gliadins have been identified. A similar situation is seen in rheumatoid arthritis (RA) with both anti-citrullinated protein antibodies (ACPA) and auto-antibodies against the citrullinating enzyme, peptidylarginine deiminase (PAD). Previously, we have suggested that a complex between an enzyme and its modified substrate constitutes the neoantigen in autoimmune diseases. Our hypothesis is challenged by findings in patients of primary Sjögren's syndrome (pSS) who do not express ACPA, but who have been reported to carry anti-PAD. The aims of our investigation were to reproduce the study claiming the presence of anti-PAD in pSS and screen for ACPA and antibodies against TG2 and PAD in pSS (n = 78), multiple sclerosis (MS) (n = 85) and Alzheimer's disease (AD) (n = 79) using ELISA. With blood donors (n = 100) as controls, no increased occurrence of autoantibodies was found among the patient groups tested. Contrary to what has been published previously, patients with pSS do not express anti-PAD. The hypothesis of a complex between an enzyme and its modified substrate constituting the neoantigen in autoimmune diseases is still valid. The prevalence of anti-PAD, anti-TG2 and ACPA is comparatively restricted. PAD and TG2 do not seem to be involved directly in autoimmune mechanisms in pSS, MS or AD.
journal_name
Scand J Immunoljournal_title
Scandinavian journal of immunologyauthors
Bodil Roth E,Theander E,Londos E,Sandberg-Wollheim M,Larsson A,Sjöberg K,Stenberg Pdoi
10.1111/j.1365-3083.2008.02115.xsubject
Has Abstractpub_date
2008-06-01 00:00:00pages
626-31issue
6eissn
0300-9475issn
1365-3083pii
SJI2115journal_volume
67pub_type
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