title: IL-10 has a distinct immunoregulatory effect on naive and active T cell subsets.
abstract: Interleukin-10 (IL-10) has been identified as a key immunomodulatory cytokine on T cells. However, both immunosuppressive and immunostimulatory effects of IL-10 on T cells also have been reported. The discrepancy between these in vitro effects of IL-10 may be due to the different T cells (naive vs. active or resting active T cells) used under various experimental conditions in these studies. Therefore, it is necessary to clearly define the IL-10 effect on T cell subsets in their different statuses. In this study, we used a molecularly defined T cell system, the ovalbumin (OVA)-specific CD4(+) and CD8(+) T cells from transgenic OT-I and OT-II mice expressing OVA-specific T cell receptor (TCR). We investigated the effect of IL-10 on these OVA-specific T cell subsets in their different statuses (i.e., naive and active T cells). Our data demonstrate that IL-10 has distinct immunoregulatory effects on naive and active T cell subsets. IL-10 inhibits active CD4(+) T cell proliferation, whereas it stimulates and suppresses active CD8(+) T cell proliferation and cytotoxicity, respectively. IL-10-treated dendritic cells (DCs) stimulate anergic cytotoxic T lymphocyte-associated molecule-4 (CTLA)-4-expressing CD4(+) T cell responses possibly through downregulation of major histocompetibility complex (MHC) class II and costimulatory molecule expression on DCs. The anergic CD4(+) T cells suppress T cell proliferation mainly through a CTLA-4-mediated pathway. The distinct role of IL-10 on T cell subsets may be useful in designing T cell-based immunotherapy of cancer and infectious diseases.
authors.affiliation: Research Unit, Health Research Division, Saskatchewan Cancer Agency, Department of Oncology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 4H4, Canada.
authors.forename: Zhenmin
authors.initials: Z
authors.lastname: Ye
authors.forename: Hui
authors.initials: H
authors.lastname: Huang
authors.forename: Siguo
authors.initials: S
authors.lastname: Hao
authors.forename: Shulin
authors.initials: S
authors.lastname: Xu
authors.forename: Hong
authors.initials: H
authors.lastname: Yu
authors.forename: Sylvia
authors.initials: S
authors.lastname: Van Den Hurk
authors.forename: Jim
authors.initials: J
authors.lastname: Xiang
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000276:immunology; D000943:Antigens, Differentiation / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D060908:CTLA-4 Antigen; D002478:Cells, Cultured; D016207:Cytokines / Q000276:immunology / Q000378:metabolism; D003602:Cytotoxicity, Immunologic; D003713:Dendritic Cells / Q000276:immunology / Q000378:metabolism; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D007114:Immunization; D016753:Interleukin-10 / Q000276:immunology*; D008213:Lymphocyte Activation; D051379:Mice; D008822:Mice, Transgenic; D010047:Ovalbumin / Q000276:immunology; D053701:Receptors, Interleukin-10 / Q000378:metabolism; D016176:T-Lymphocyte Subsets / Q000276:immunology* / Q000378:metabolism
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D060908:CTLA-4 Antigen; C556707:Ctla4 protein, mouse; D016207:Cytokines; D000949:Histocompatibility Antigens Class II; D053701:Receptors, Interleukin-10; D016753:Interleukin-10; D010047:Ovalbumin