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Dysregulation of T lymphocyte function in itchy mice: a role for Itch in TH2 differentiation

Abstract

Itch is an E3 ubiquitin ligase that is disrupted in nonagouti-lethal or itchy mice. Itch deficiency leads to severe immune and inflammatory disorders and constant itching of the skin. Here we show that Itch−/− T cells show an activated phenotype and enhanced proliferation. Production of the type 2 T helper (TH2) cell cytokines interleukin 4 (IL-4) and IL-5 by Itch−/− T cells was augmented upon stimulation, and the TH2-dependent serum concentrations of immunoglobulin G1 (IgG1) and IgE in itchy mice were also increased. Molecularly, Itch associated with and induced ubiquitination of JunB, a transcription factor that is involved in TH2 differentiation. These results provide a molecular link between Itch deficiency and the aberrant activation of immune responses in itchy mice.

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Figure 1: Flow cytometric analysis of Itch−/− and wild-type mice.
Figure 2: Cell proliferation and cytokine production of primary T cells from Itch−/− and wild-type mice.
Figure 3: Increased serum IgG1 and IgE concentrations in Itch−/− mice.
Figure 4: T cell activation in Itch−/− T cells.
Figure 5: JunB ubiquitination by Itch.
Figure 6: JunB protein expression and its DNA binding in Itch−/− T cells.

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Acknowledgements

We thank A. Altman, Y. Tanaka, M. Jeon and others at the Division of Cell Biology for support and suggestions. Supported by grants from National Institutes of Health (RO1DK56558) and American Cancer Society (to Y.-C. L.).

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Correspondence to Yun-Cai Liu.

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Supplementary information

Web Figure 1.

Effect of Itch on reporter-based transactivation. Jurkat cells were transfected with either AP-1- or NF-κB–driven luciferase reporter in the absence or the presence of wild-type Itch or Itch CA mutant. The relative luciferase activity was normalized and presented as fold increase over the basal activity. Thirty hours after transfection, cells were left untreated or stimulated with anti-CD3 for 6 h, collected and washed twice with PBS. Luciferase activity in the cell extracts was determined in triplicate by luminometry. Each experiment was repeated at least three times. (GIF 11 kb)

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Fang, D., Elly, C., Gao, B. et al. Dysregulation of T lymphocyte function in itchy mice: a role for Itch in TH2 differentiation. Nat Immunol 3, 281–287 (2002). https://doi.org/10.1038/ni763

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