title: Resistance to IL-10 inhibition of interferon gamma production and expression of suppressor of cytokine signaling 1 in CD4+ T cells from patients with rheumatoid arthritis.
abstract: IL-10 has been shown to block the antigen-specific T-cell cytokine response by inhibiting the CD28 signaling pathway. We found that peripheral blood CD4+ T cells from patients with active rheumatoid arthritis (RA) were able to produce greater amounts of interferon gamma after CD3 and CD28 costimulation in the presence of 1 ng/ml IL-10 than were normal control CD4+ T cells, although their surface expression of the type 1 IL-10 receptor was increased. The phosphorylation of signal transducer and activator of transcription 3 was sustained in both blood and synovial tissue CD4+ T cells of RA, but it was not augmented by the presence of 1 ng/ml IL-10. Sera from RA patients induced signal transducer and activator of transcription 3 phosphorylation in normal CD4+ T cells, which was mostly abolished by neutralizing anti-IL-6 antibody. Preincubation of normal CD4+ T cells with IL-6 reduced IL-10-mediated inhibition of interferon gamma production. Blood CD4+ T cells from RA patients contained higher levels of suppressor of cytokine signaling 1 but lower levels of suppressor of cytokine signaling 3 mRNA compared with control CD4+ T cells, as determined by real-time PCR. These results indicate that RA CD4+ T cells become resistant to the immunosuppressive effect of IL-10 before migration into synovial tissue, and this impaired IL-10 signaling may be associated with sustained signal transducer and activator of transcription 3 activation and suppressor of cytokine signaling 1 induction.
authors.affiliation: Department of Medicine and Clinical Science, Graduate School of Medicine and Dentistry, Okayama University, Okayama, Japan. jyamanajyamana@yahoo.co.jp
authors.forename: Jiro
authors.initials: J
authors.lastname: Yamana
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamamura
authors.forename: Akira
authors.initials: A
authors.lastname: Okamoto
authors.forename: Tetsushi
authors.initials: T
authors.lastname: Aita
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Iwahashi
authors.forename: Katsue
authors.initials: K
authors.lastname: Sunahori
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Makino
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D018106:CD28 Antigens / Q000502:physiology; D017252:CD3 Complex / Q000502:physiology; D015496:CD4-Positive T-Lymphocytes / Q000187:drug effects* / Q000276:immunology / Q000378:metabolism; D002478:Cells, Cultured / Q000187:drug effects / Q000276:immunology / Q000378:metabolism; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects*; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis* / Q000235:genetics; D016753:Interleukin-10 / Q000494:pharmacology*; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics; D008297:Male; D008875:Middle Aged; D010766:Phosphorylation; D011499:Protein Processing, Post-Translational; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D018123:Receptors, Interleukin / Q000096:biosynthesis / Q000235:genetics; D053701:Receptors, Interleukin-10; D012097:Repressor Proteins / Q000096:biosynthesis* / Q000235:genetics; D000071222:Suppressor of Cytokine Signaling 1 Protein; D050826:Suppressor of Cytokine Signaling Proteins / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D018106:CD28 Antigens; D017252:CD3 Complex; D047908:Intracellular Signaling Peptides and Proteins; D012333:RNA, Messenger; D018123:Receptors, Interleukin; D053701:Receptors, Interleukin-10; D012097:Repressor Proteins; C108944:SOCS1 protein, human; D000071222:Suppressor of Cytokine Signaling 1 Protein; D050826:Suppressor of Cytokine Signaling Proteins; D016753:Interleukin-10; D007371:Interferon-gamma