期刊
SCANDINAVIAN JOURNAL OF IMMUNOLOGY
卷 64, 期 5, 页码 531-535出版社
WILEY
DOI: 10.1111/j.1365-3083.2006.01837.x
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Patients with type 1 diabetes are suffering from defects in immune regulatory cells. Their siblings may be at increased risk of type 1 diabetes especially if they are carriers of certain human leucocyte antigen (HLA) alleles. In a prospective non-randomized study, we intended to evaluate 31 healthy siblings of paediatric patients with type 1 diabetes and explore immune regulatory populations of CD4(+) CD25(+) T cells and natural killer (NK) T cells. Tested siblings of type 1 diabetes patients were stratified according to the HLA-associated risk of possible diabetes development. Immune regulatory function of CD4(+) CD25(+) T cells was tested in vitro. Significant differences in CD4(+) CD25(+) but not in NK T cells have been identified. Siblings of type 1 diabetes patients carrying high risk HLA alleles (DQA1*05, DQB1*0201, DQB1*0302) had significantly lower number of immune regulatory CD4(+) CD25(+) T cells than the age-matched healthy controls or siblings carrying low-risk HLA alleles (DQB1*0301, DQB1*0603, DQB1*0602). Regulatory function of CD4(+) CD25(+) T cells demonstrated a dose-escalation effect. In siblings of type 1 diabetes patients, the defect in immune regulatory CD4(+) CD25(+) T cells exists in association with genetic HLA-linked risk for type 1 diabetes.
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