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Essential role of Mediator subunit Med1 in invariant natural killer T-cell development

By X. Yue, A. Izcue and T. Borggrefe


CD1d-restricted invariant NKT (iNKT) cells are a unique lineage of T lymphocytes that regulate both innate and adaptive immunity. The Mediator complex forms the bridge between transcriptional activators and the general transcription machinery. Med1/TRAP220 (also called DRIP205) is a key component of Mediator that interacts with ligand-bound hormone receptors, such as the vitamin D receptor. Here, we show that T-cell-specific Med1 deficiency results in a specific block in iNKT cell development but the development of conventional αβ T cells remains grossly normal. The defect is cell-intrinsic and depends neither on apoptosis, cell-cycle control, nor on CD1d expression of CD4<sup>+</sup>CD8<sup>+</sup> double-positive thymocytes. Surprisingly, ectopic expression of a Vα14-Jα18 T-cell receptor transgene completely rescues the defect caused by Med1 deficiency. At the molecular level, thymic iNKT cells in Med1<sup>-/-</sup> animals display reduced levels of IL-2Rβ and T-bet expression and could not complete terminal maturation. Thus, Med1 is essential for a complete intra-thymic development of iNKT cells

Year: 2011
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Provided by: MPG.PuRe
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