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• W2078574377 abstract "ObjectiveInterleukin (IL)-10 is an immunosuppressive cytokine produced by many cell types, including T cells. We previously reported that a novel type of regulatory T (Treg) cells, termed HOZOT, which possesses a FOXP3+CD4+CD8+CD25+ phenotype and dual suppressor/cytotoxic activities, produced high levels of IL-10. In this study, we examined the mechanisms of high IL-10 production by HOZOT, focusing on Janus activating kinase (JAK)/signal transducers and activators of transcription (STAT) signaling pathway.Materials and MethodsWe prepared five different types of T cells, including HOZOT from human umbilical cord blood. Cytokine productions of IL-10, interferon-γ (IFN-γ), and tumor necrosis factor-α (TNF-α) were compared among these T cells after anti-CD3/CD28 antibody stimulation in the presence or absence of IL-2. Specific inhibitors for JAK/STAT, nuclear factor-κB (NF-κB), and nuclear factor for activated T cell (NFAT) were used to analyze signal transduction mechanisms.ResultsIL-10 production by HOZOTs was greatly enhanced by the addition of IL-2. Little or no enhancement of IFN-γ and TNF-α production was observed under the same conditions. The enhancing effect of IL-2 was specific for both HOZOT and IL-10–secreting Treg cells. T helper type 2 cells, whose IL-10 production mechanisms involve GATA-3, failed to show IL-2–mediated enhancement of IL-10. Similar enhancing effects of IL-15 and IFN-α suggested a major role of JAK/STAT activation pathway for high IL-10 production. Further inhibitor experiments demonstrated that STAT5 rather than STAT3 was critically involved in this mechanism.ConclusionOur results demonstrated that IL-2 selectively enhanced production of IL-10 in HOZOT primarily through activation of STAT5, which synergistically acts with NF-κB/NFAT activation, implying a novel regulatory mechanism of IL-10 production in Treg cells. Interleukin (IL)-10 is an immunosuppressive cytokine produced by many cell types, including T cells. We previously reported that a novel type of regulatory T (Treg) cells, termed HOZOT, which possesses a FOXP3+CD4+CD8+CD25+ phenotype and dual suppressor/cytotoxic activities, produced high levels of IL-10. In this study, we examined the mechanisms of high IL-10 production by HOZOT, focusing on Janus activating kinase (JAK)/signal transducers and activators of transcription (STAT) signaling pathway. We prepared five different types of T cells, including HOZOT from human umbilical cord blood. Cytokine productions of IL-10, interferon-γ (IFN-γ), and tumor necrosis factor-α (TNF-α) were compared among these T cells after anti-CD3/CD28 antibody stimulation in the presence or absence of IL-2. Specific inhibitors for JAK/STAT, nuclear factor-κB (NF-κB), and nuclear factor for activated T cell (NFAT) were used to analyze signal transduction mechanisms. IL-10 production by HOZOTs was greatly enhanced by the addition of IL-2. Little or no enhancement of IFN-γ and TNF-α production was observed under the same conditions. The enhancing effect of IL-2 was specific for both HOZOT and IL-10–secreting Treg cells. T helper type 2 cells, whose IL-10 production mechanisms involve GATA-3, failed to show IL-2–mediated enhancement of IL-10. Similar enhancing effects of IL-15 and IFN-α suggested a major role of JAK/STAT activation pathway for high IL-10 production. Further inhibitor experiments demonstrated that STAT5 rather than STAT3 was critically involved in this mechanism. Our results demonstrated that IL-2 selectively enhanced production of IL-10 in HOZOT primarily through activation of STAT5, which synergistically acts with NF-κB/NFAT activation, implying a novel regulatory mechanism of IL-10 production in Treg cells." @default.
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• W2078574377 date "2008-02-01" @default.
• W2078574377 modified "2023-10-13" @default.
• W2078574377 title "IL-2 activation of STAT5 enhances production of IL-10 from human cytotoxic regulatory T cells, HOZOT" @default.
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• W2078574377 doi "https://doi.org/10.1016/j.exphem.2007.09.010" @default.
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