title: Interleukin-10 (IL-10) secretion in systemic lupus erythematosus and rheumatoid arthritis: IL-10-dependent CD4+CD45RO+ T cell-B cell antibody synthesis.
abstract: Interleukin-10 (IL-10) is a major immunoregulatory cytokine and has a multitude of immunomodulatory effects in the immune system. In this study, we have examined the secretion and in vitro function of IL-10 in B cell hyperactivity in antibody production in two common autoimmune diseases, systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA). IL-10 was detectable in serum of all active SLE and serum and synovial fluid samples of all RA patients but in none of the normal controls. B cells and CD4+CD45RO+ "memory" T cells secreted highly enhanced levels of IL-10 in SLE and RA versus normals. Increased IgM and IgG production by B cells-CD4+CD45RO+ T cells in SLE and RA was IL-10 dependent, since neutralization of IL-10 cytokine by anti-IL-10 antibody drastically reduced Ig synthesis in these coculture experiments. B cell hyperactivity in autoantibody production in SLE and RA may be a function of IL-10-dependent CD4+CD45RO+ Th2 cell activation. Therefore, IL-10 may play an important role in highly disturbed immune system and B cell-T cell function in these immune disorders.
authors.affiliation: Department of Internal Medicine (Rheumatology), King Saud University, College of Medicine, Abha, Saudi Arabia.
authors.forename: M
authors.initials: M
authors.lastname: al-Janadi
authors.forename: A
authors.initials: A
authors.lastname: al-Dalaan
authors.forename: S
authors.initials: S
authors.lastname: al-Balla
authors.forename: M
authors.initials: M
authors.lastname: al-Humaidi
authors.forename: S
authors.initials: S
authors.lastname: Raziuddin
mesh_terms: D000293:Adolescent; D000328:Adult; D001172:Arthritis, Rheumatoid / Q000150:complications / Q000276:immunology*; D001402:B-Lymphocytes / Q000187:drug effects / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000187:drug effects / Q000378:metabolism; D005260:Female; D006801:Humans; D006942:Hypergammaglobulinemia / Q000209:etiology; D007371:Interferon-gamma / Q000037:antagonists & inhibitors; D016753:Interleukin-10 / Q000037:antagonists & inhibitors / Q000276:immunology*; D017493:Leukocyte Common Antigens / Q000187:drug effects / Q000276:immunology; D008180:Lupus Erythematosus, Systemic / Q000150:complications / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D009000:Monocytes / Q000187:drug effects / Q000378:metabolism; D000093242:Interleukin-6 Inhibitors
chemical_list: D007371:Interferon-gamma; D016753:Interleukin-10; D017493:Leukocyte Common Antigens; D000093242:Interleukin-6 Inhibitors