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Journal Article
Research Support, Non-U.S. Gov't
Alternative pathway for the development of V α 14 + NKT cells directly from CD4 - CD8 - thymocytes that bypasses the CD4 + CD8 + stage.
Nature Immunology 2017 March
Although invariant Vα 14+ natural killer T cells (NKT cells) are thought to be generated from CD4+ CD8+ double-positive (DP) thymocytes, the developmental origin of CD4- CD8- double-negative (DN) NKT cells still remains unresolved. Here we provide definitive genetic evidence obtained, through studies of mice with DP-stage-specific ablation of expression of the gene encoding the recombinase component RAG-2 (Rag2) and by a fate-mapping approach, that supports the proposal of the existence of an alternative developmental pathway through which a fraction of DN NKT cells with strong T-helper-type-1 (TH 1)-biased and cytotoxic characteristics develop from late DN-stage thymocytes, bypassing the DP stage. These findings provide new insight into understanding of the development of NKT cells and propose a role for timing of expression of the invariant T cell antigen receptor in determining the functional properties of NKT cells.
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