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. 1988 Dec;29(12):1628–1631. doi: 10.1136/gut.29.12.1628

Altered gastrointestinal immune response in sarcoidosis.

P A McCormick 1, C Feighery 1, C Dolan 1, C O'Farrelly 1, P Kelliher 1, F Graeme-Cook 1, A Finch 1, K Ward 1, M X Fitzgerald 1, D P O'Donoghue 1, et al.
PMCID: PMC1434106  PMID: 3265402

Abstract

Because of the possible clinical association between coeliac disease and sarcoidosis, the incidence of humoral sensitivity to dietary proteins was examined in patients with sarcoidosis. Raised concentrations of circulating IgG antibodies to alpha gliadin were found in 41/99 sarcoid patients whereas antibody levels to casein, beta lactoglobulin and ovalbumin were similar to normal controls. Subsequently, a group of 26 sarcoid patients were selected for small intestinal biopsy; 11 had raised and 15 normal alpha gliadin antibody (AGA) levels. One AGA positive patient had villous atrophy consistent with coeliac disease. Intraepithelial lymphocyte (IEL) counts were raised in AGA positive (median 30; 95% confidence limits 22-46) and AGA negative (median 24; 95% confidence limits 19-32) sarcoid patients when compared with a control group (median 13.5; 95% confidence limits 10-18) p less than 0.01. Serum IgG concentrations were raised in 11/52 patients tested but there was no correlation between IgG levels and the presence of IgG antigliadin antibodies. HLA Dr typing was done in 21 of the 26 biopsied patients. The coeliac disease associated antigen Dr3 was present in eight of 21 (38%) which is very similar to the prevalence in unselected blood donors (34%). There was no significant difference in IEL counts between Dr3 positive and Dr3 negative sarcoid patients. These findings suggest that in patients with sarcoidosis, there is an altered gastrointestinal mucosal immune response, accompanied in about 40% of patients by specific sensitisation to wheat protein.

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Selected References

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