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- W1644751088 abstract "Abstract Activation of naive CD8 T cells in vitro in the presence of IL-4 induces type 2 cytokine expression, loss of CD8 expression, and reduced cytolytic potential. This represents a major shift from the canonical phenotype of effector CD8 T cells. It has not been established, however, whether IL-4 can induce comprehensive type 2 cytokine expression by CD8 T cells in vivo, nor whether the effects of IL-4 on type 2 cytokine production by CD8 T cells can be inhibited by IFN-γ. Furthermore, disparate results have been reported regarding the anti-tumor ability of type 2 polarized effector CD8 T cells, and the effects of IFN-γ in this respect remain unknown. To address these questions, wild-type or IFN-γ–deficient OVA-specific CD8+ T cells were activated in RAG-2−/− γc−/− recipients with control or IL-4–expressing OVA+ tumor cells, and then transferred to secondary recipients for tumor challenge. Tumor-derived IL-4 induced the expression of type 2 cytokines and the transcription factor GATA-3 by responding CD8 T cells while reducing their CD8 coreceptor expression and ability to eliminate a secondary tumor challenge. Each of these effects of IL-4 was exaggerated in IFN-γ–deficient, compared with wild-type, CD8 T cells. The results demonstrate that endogenous IFN-γ counteracts the induction of type 2 cytokines and the downregulation of both CD8 coreceptor levels and the anti-tumor response in CD8 T cells exposed to IL-4 during activation in vivo. These findings may explain the anomalies in the reported functional phenotype of type 2 polarized CD8 T cells." @default.
- W1644751088 created "2016-06-24" @default.
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- W1644751088 date "2010-07-15" @default.
- W1644751088 modified "2023-10-04" @default.
- W1644751088 title "IFN-γ Inhibits IL-4–Induced Type 2 Cytokine Expression by CD8 T Cells In Vivo and Modulates the Anti-Tumor Response" @default.
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- W1644751088 doi "https://doi.org/10.4049/jimmunol.0903372" @default.
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