title: Premature immunosenescence in rheumatoid arthritis and multiple sclerosis patients.
abstract: Patients with T-cell-mediated autoimmune diseases show immune system abnormalities that resemble the typical characteristics of autoimmune dysfunction described in the elderly. In addition, the incidence of autoimmune disease increases with advancing age. To evaluate whether patients with rheumatoid arthritis (RA) and multiple sclerosis (MS) have premature immuno-senescence, we measured two indicators of aging: the number of T-cell-receptor excision circles (TRECs) and the percentage of CD4+CD28(null) T cells. We studied them in the peripheral blood mononuclear cells (PBMCs) of 60 RA patients, 32 MS patients, and 40 healthy controls (HCs). We found that TREC numbers were lower in RA and MS patients than in age-matched HCs, indicating premature thymic involution. Moreover, a subset of these patients contained age-inappropriate high frequencies of CD4+CD28(null) T cells. This study provides evidence of premature immune system senescence in both RA and MS patients. Premature aging could be a risk factor for developing autoimmune disorders in genetically predisposed individuals in a susceptible environment.
authors.affiliation: Biomedisch Onderzoeksinstituut, Limburgs Universitair Centrum, Universitary Campus, B-3590 Diepenbeek, Belgium.
authors.forename: Marielle
authors.initials: M
authors.lastname: Thewissen
authors.forename: Loes
authors.initials: L
authors.lastname: Linsen
authors.forename: Veerle
authors.initials: V
authors.lastname: Somers
authors.forename: Piet
authors.initials: P
authors.lastname: Geusens
authors.forename: Jef
authors.initials: J
authors.lastname: Raus
authors.forename: Piet
authors.initials: P
authors.lastname: Stinissen
mesh_terms: D000293:Adolescent; D000328:Adult; D000375:Aging / Q000276:immunology*; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D018106:CD28 Antigens / Q000032:analysis; D015496:CD4-Positive T-Lymphocytes / Q000502:physiology; D006801:Humans; D007107:Immune System / Q000502:physiology*; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000276:immunology*; D013950:Thymus Gland / Q000473:pathology
chemical_list: D018106:CD28 Antigens