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In Vitro Differentiation of Human CD4+FOXP3+ Induced Regulatory T Cells (iTregs) from Naïve CD4+ T Cells Using a TGF-β-containing Protocol
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UXT is a novel regulatory factor of regulatory T cells associated with Foxp3

Weina Li1, Lili Wang, Changli Jiang

  • 1The State Key Laboratory of Cancer Biology, Department of Biopharmaceutics, School of Pharmacy, The Fourth Military Medical University, Xi'an, Shaanxi, China.

European Journal of Immunology
|October 19, 2013
PubMed

Regulatory T (Treg) cells are a constitutively immunosuppressive subtype of T cells that contribute to the maintenance of immunological self-tolerance and immune homeostasis. However, the molecular mechanisms involved in the regulation of Treg cells remain unclear. In the present study, we identified ubiquitously expressed transcript (UXT) to be a novel regulator of human Treg-cell function. In cultured human Treg cells, UXT associates with Foxp3 in the nucleus by interacting with the proline-rich domain in the N-terminus of Foxp3. Knockdown of UXT expression in Treg cells results in a less-suppressive phenotype, demonstrating that UXT is an important regulator of the suppressive actions of Treg cells. Depletion of UXT affects the localization stability of Foxp3 protein in the nucleus and downregulates the expression of Foxp3-related genes. Overall, our results show that UXT is a cofactor of Foxp3 and an important player in Treg-cell function.

Keywords:
CofactorFoxp3Immune suppressionRegulatory T (Treg) cellUXT

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