Abstract
Itch is an E3 ubiquitin ligase that is originally identified by genetic analysis of a mutant mouse with aberrant immunological phenotypes and constant itching in the skin. Itch–/– T cells are biased toward the differentiation of T helper type 2 cells with augmented interleukin-4 cytokine production and serum IgE level. One of the mechanisms for Itch E3 ligase to regulate T cell responses is the induction of T cell anergy in which T cells become unresponsive upon restimulation. However, the detailed mechanisms underlying Itch-mediated protein ubiquitination and allergic responses remain to be investigated. Here we provide evidence that Itch is involved in the regulation of transforming growth factor (TGF)-β signaling in naïve T cells and TGF-β-induced expression of the transcription factor Foxp3, a master regulator in regulatory T cells. Itch promotes ubiquitin conjugation to TGF-β inducible early gene 1 product (TIEG1). Moreover, monoubiquitinated TIEG1 positively modulates the transcription of Foxp3 gene. The results suggest a novel mechanism by which Itch regulates regulatory T cells and subsequent allergic responses.
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Acknowledgements
The author thanks the contributions from postdoctoral fellows trained in this laboratory and from outside collaborators. The work on Itch project is supported by NIH funding.
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Liu, YC. (2008). Regulation of T Cell Differentiation and Allergic Responses by the E3 Ubiquitin Ligase Itch. In: Jentsch, S., Haendler, B. (eds) The Ubiquitin System in Health and Disease. Ernst Schering Foundation Symposium Proceedings, vol 2008/1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/2789_2008_106
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DOI: https://doi.org/10.1007/2789_2008_106
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