(Journal Article): Defective suppressor function in CD4(+)CD25(+) T-cells from patients with type 1 diabetes.
 
Lindley S, Dayan CM, Bishop A, Roep BO, Peakman M, Tree TI (Department of Immunobiology, Guy's, King's and St Thomas' School of Medicine, 2nd Floor, New Guy's House, Guy's Hospital London SE1 9RT, UK.)
 
IN: Diabetes 2005; 54:92-99
Impact Factor(s) of Diabetes: 8.848 (2004), 8.298 (2003), 8.256 (2002), 7.7 (2001)

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ABSTRACT: Type 1 diabetes is a T-cell-mediated disease that is associated with loss of immunological tolerance to self-antigens. The mechanisms involved in maintenance of peripheral tolerance include a specialized subset of regulatory T-cells (Treg) within the CD4(+)CD25(+) T-cell population, but the function and phenotype of these cells in type 1 diabetes have not been investigated. We hypothesized that a deficiency in the CD4(+)CD25(+) Treg population or its function could contribute to the lack of self-tolerance evident in patients with type 1 diabetes. We show that although levels of CD4(+)CD25(+) T-cells are normal in patients with recent-onset adult type 1 diabetes, the ability of the Tregs in this population to suppress T-cell proliferation during in vitro cocultures is markedly reduced compared with control subjects (P = 0.007). Moreover, in patients with type 1 diabetes, these cocultures display a more proinflammatory phenotype, with increased secretion of interferon-gamma (P = 0.005) and decreased interleukin-10 production (P = 0.03). These deficiencies may reflect a disturbance in the balance of the CD4(+)CD25(+) population, because in patients with type 1 diabetes, a higher proportion of these cells coexpress the early activation marker CD69 (P = 0.007) and intracellular CTLA-4 (P = 0.01). These data demonstrate deficiency in function of the CD4(+)CD25(+) Treg population that may influence the pathogenesis of type 1 diabetes.

TYPE OF PUBLICATION: Original article

Articles citing this article:

• Thomas D, Zaccone P, Cooke A. The Role of Regulatory T Cell Defects in Type I Diabetes and the Potential of these Cells for Therapy. Rev Diabetic Stud 2005. 2: 9-18.
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