title: Altered production of immunoregulatory cytokines by invariant Valpha19 TCR-bearing cells dependent on the duration and intensity of TCR engagement.
abstract: Cells bearing invariant Valpha19-Jalpha33 TCR alpha chains are believed to participate in the regulation of inflammatory autoimmune diseases. In this study, the potential to produce immunoregulatory cytokines by these cells was characterized in order to find the mechanism underlying their immunoregulatory functions. Serum levels of IL-4, IL-10, transforming growth factor-beta, IFN-gamma and IL-17 increased in mice over-expressing an invariant Valpha19-Jalpha33 TCR alpha transgene (Valpha19 Tg) in response to anti-CD3 antibody injection. NK1.1(+) Valpha19 Tg(+), but not NK1.1(-) Valpha19 Tg(+) cells, promptly produced immunoregulatory IL-4, IFN-gamma and IL-17 upon invariant TCR engagement with immobilized anti-CD3 antibody in culture. The activation of Valpha19 Tg(+) cells then triggered the production of pro-inflammatory cytokines by bystander cells. Interestingly, the ratio of T(h)2 cytokines such as IL-4, IL-5 and IL-10, but not pro-inflammatory IL-17, to IFN-gamma was increased when the intensity of the stimulation to invariant TCR was attenuated. Collectively, these findings suggest that invariant Valpha19 TCR(+) cells have the potential to participate in the regulation of inflammatory autoimmunity by producing T(h)2-biased cytokines in certain circumstances.
authors.affiliation: Developmental Immunology Unit, Mitsubishi Kagaku Institute of Life Sciences, Machida, Tokyo, Japan. michio@libra.ls.m-kagaku.co.jp
authors.forename: Michio
authors.initials: M
authors.lastname: Shimamura
authors.forename: Yi-Ying
authors.initials: YY
authors.lastname: Huang
authors.forename: Masumi
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Goji
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000950:Antigens, Ly; D017252:CD3 Complex / Q000276:immunology; D002478:Cells, Cultured; D016207:Cytokines / Q000235:genetics / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000276:immunology; D019673:Genes, T-Cell Receptor alpha / Q000235:genetics / Q000276:immunology*; D008099:Liver / Q000166:cytology / Q000378:metabolism*; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D055651:NK Cell Lectin-Like Receptor Subfamily B; D011485:Protein Binding / Q000276:immunology; D055550:Protein Stability; D011948:Receptors, Antigen, T-Cell / Q000235:genetics / Q000378:metabolism*; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics / Q000276:immunology; D015398:Signal Transduction / Q000276:immunology; D013045:Species Specificity; D018418:Th2 Cells / Q000166:cytology / Q000276:immunology / Q000378:metabolism*
chemical_list: D000911:Antibodies, Monoclonal; D000950:Antigens, Ly; D017252:CD3 Complex; D016207:Cytokines; C527211:Klrb1c protein, mouse; D055651:NK Cell Lectin-Like Receptor Subfamily B; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta