title: New insights into the pathogenesis of rheumatoid arthritis.
abstract: T lymphocytes play a critical role in the inflammatory process of rheumatoid arthritis (RA). Studies in a new animal model of RA, created by implanting human inflamed synovium into SCID mice, have confirmed that the production of matrix-degrading enzymes and pro-inflammatory cytokines is ultimately under T-cell control. T-cell dysfunction in RA patients also alters T-cell dynamics, resulting in profound abnormalities in T-cell pool composition. The cause and consequences of altered T-cell dynamics in RA are not yet understood, but factors determining T-cell homeostasis include the generation of new T cells, loss of T cells during immune responses and self-renewal of T cells within the system. Understanding the mechanisms that govern the formation of the T-cell pool in RA emphasizes the dynamic and quantitative aspects of lymphocyte behaviour in RA and has profound therapeutic implications when devising strategies to counteract T-cell dysfunction.
authors.affiliation: Department of Medicine, Mayo Clinic, Rochester, MN 55905, USA.
authors.forename: C M
authors.initials: CM
authors.lastname: Weyand
mesh_terms: D000818:Animals; D001172:Arthritis, Rheumatoid / Q000209:etiology* / Q000276:immunology; D016207:Cytokines / Q000494:pharmacology; D004195:Disease Models, Animal; D006706:Homeostasis; D006801:Humans; D051379:Mice; D016513:Mice, SCID; D013583:Synovial Membrane / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D016207:Cytokines