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- W2014381801 abstract "IFN-gamma and IL-12 are crucial cytokines for cell-mediated immunity against intracellular pathogens. We have previously shown that human IL-12Rbeta1-deficiency leads to impaired IL-12 responsiveness and unusual susceptibility to infections due to mycobacteria and salmonellae. IL-23 is a cytokine with functions that partially overlap with those of IL-12. IL-23 consists of IL-12p40 and a novel p19 protein, and binds to a receptor complex comprising IL-12Rbeta1 and IL-23R. Thus, IL-12Rbeta1-deficiency may impair both IL-12- and IL-23 signaling, and both may contribute to the immunological phenotypes. To examine whether IL-12Rbeta1 is essential for IL-23 signaling in human T cells, we have studied IL-23 responsiveness of four IL-12Rbeta1-deficient individuals. Whereas IL-23 promoted IFN-gamma production by CD4(+) and CD8(+) T cells in controls, IL-12Rbeta1-deficient T cells lacked IL-23-induced IFN-gamma secretion, but responded normally to IL-2, IL-4, IL-15 and IL-18. We also show that induction of IFN-gamma production by IL-23 depends upon TCR-ligation and is enhanced by CD28-costimulation. Furthermore, IL-23 cooperates with IL-12 and IL-18 in promoting IFN-gamma production in controls, but not in patients. We conclude that IL-12Rbeta1-deficiency impairs IL-12- and IL-23-dependent signaling in human T cells. The syndrome caused by IL-12Rbeta1-deficiency thus needs to be reinterpreted as resulting from defective IL-12-as well as IL-23-mediated immunity." @default.
- W2014381801 created "2016-06-24" @default.
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- W2014381801 date "2003-12-01" @default.
- W2014381801 modified "2023-10-15" @default.
- W2014381801 title "IL-12 receptor deficiency revisited: IL-23-mediated signaling is also impaired in human genetic IL-12 receptorβ1 deficiency" @default.
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- W2014381801 doi "https://doi.org/10.1002/eji.200324343" @default.
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