title: Defective suppressor function of human CD4+ CD25+ regulatory T cells in autoimmune polyglandular syndrome type II.
abstract: In autoimmune polyglandular syndromes (APS), several organ-specific autoimmune diseases are clustered. Although APS type I is caused by loss of central tolerance, the etiology of APS type II (APS-II) is currently unknown. However, in several murine models, depletion of CD4(+) CD25(+) regulatory T cells (T(regs)) causes a syndrome resembling human APS-II with multiple endocrinopathies. Therefore, we hypothesized that loss of active suppression in the periphery could be a hallmark of this syndrome. T(regs) from peripheral blood of APS-II, control patients with single autoimmune endocrinopathies, and normal healthy donors showed no differences in quantity (except for patients with isolated autoimmune diseases), in functionally important surface markers, or in apoptosis induced by growth factor withdrawal. Strikingly, APS-II T(regs) were defective in their suppressive capacity. The defect was persistent and not due to responder cell resistance. These data provide novel insights into the pathogenesis of APS-II and possibly human autoimmunity in general.
authors.affiliation: Department of Medicine III, Institute for Clinical Immunology and Rheumatology, University of Erlangen-Nuremberg, Germany. MartinKriegel@hotmail.com
authors.forename: Martin A
authors.initials: MA
authors.lastname: Kriegel
authors.forename: Tobias
authors.initials: T
authors.lastname: Lohmann
authors.forename: Christoph
authors.initials: C
authors.lastname: Gabler
authors.forename: Norbert
authors.initials: N
authors.lastname: Blank
authors.forename: Joachim R
authors.initials: JR
authors.lastname: Kalden
authors.forename: Hanns-Martin
authors.initials: HM
authors.lastname: Lorenz
mesh_terms: D000224:Addison Disease / Q000276:immunology; D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000276:immunology; D001327:Autoimmune Diseases / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D003922:Diabetes Mellitus, Type 1 / Q000276:immunology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016884:Polyendocrinopathies, Autoimmune / Q000276:immunology*; D015375:Receptors, Interleukin-2 / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*; D013967:Thyroiditis, Autoimmune / Q000276:immunology
chemical_list: D015703:Antigens, CD; D015375:Receptors, Interleukin-2