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Contributo in rivista
Tipo: Articolo in rivista
Titolo: An immunodominant DQ8 restricted gliadin peptide activates small intestinal immune response in in vitro cultured mucosa from HLA-DQ8 positive but not HLA-DQ8 negative coeliac patients.
Anno di pubblicazione: 2003
Autori: Mazzarella G, Maglio M, Paparo F, Nardone G, Stefanile R, Greco L, van de Wal Y, Kooy Y, Koning F, Auricchio S, Troncone R.
Affiliazioni autori: G Mazzarella, R Stefanile, Institute of Food Science and Technology, CNR Avellino; M Maglio, F Paparo, L Greco, R Troncone, S Auricchio, Department of Paediatrics and European Laboratory for the Investigation of Food-Induced Diseases,University Federico II, Naples, Italy;G Nardone, Department of Experimental Medicine, University Federico II, Naples, Italy;Y van de Wal, Y Kooy, F Koning, Department of Immunohaematology and Blood Transfusion, University Medical Centre, Leiden, the Netherlands
Abstract: BACKGROUND: Studies on intestinal T cell clones from the mucosa of patients with coeliac disease have led to the identification of immunogenic gliadin epitopes. One is HLA-DQ8 restricted, its recognition by T cells being increased by introduction of negatively charged residues operated by tissue transglutaminase. AIM: To test HLA-DQ8 restricted epitope in both native (QYPSGQGSFQPSQQNPQA) and deamidated (QYPSGEGSFQPSQENPQA) forms in an organ culture system of treated coeliac mucosa from HLA-DQ8 positive and HLA-DQ8 negative patients. PATIENTS AND METHODS: Jejunal biopsies obtained from 10 patients with coeliac disease (six HLA-DQ8 positive and four HLA-DQ8 negative) were cultured in vitro with a peptic-tryptic digest (PT) of gliadin, or with the native (peptide A) or deamidated (peptide B) peptide. Intraepithelial CD3(+) and lamina propria total CD25(+) and CD3(+)CD25(+) cells were counted, lamina propria intercellular adhesion molecule 1 (ICAM-1) expression was evaluated, as well as that of Fas molecules on epithelial cells. RESULTS: In HLA-DQ8 positive, but not in HLA-DQ8 negative, coeliacs the density of intraepithelial CD3(+) cells, lamina propria total CD25(+), and CD3(+)CD25(+) cells, as well as expression of ICAM-1 and Fas molecules were significantly increased in biopsies cultured with PT, peptide A, or peptide B compared with biopsies cultured in medium alone. CONCLUSION: These data show that the DQ8 restricted gliadin peptide is immunogenic only in the intestinal mucosa of HLA-DQ8 positive coeliac patients in both native and deamidated forms.
Pagine da: 57
Pagine a: 62
British Medical Association,
Numero volume: 52(1)
Altre informazioni: 21
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