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Developmental dynamics of post-selection thymic DN iNKT. | LitMetric
Background : Invariant natural killer T (iNKT) cells develop in the thymus and branch off from the maturation pathway of conventional T cell at the DP stage. While different stages of iNKT cellular development have been defined, the actual time that iNKT cell precursors spend at each stage is still unknown.Methodology/principal Finding : Here we report on maturation dynamics of post-selection DN iNKT cells by injecting wild-type DP(dim) thymocytes into the thymus of TCRα(-/-) mice and using the Vα14-Jα18 rearrangements as a molecular marker to follow the maturation dynamics of these cells.Conclusion/significance : This study shows that the developmental dynamics of DN iNKT cells in DP(dim) are very rapid and that it takes less than 1 day to down-regulate CD4 and CD8 and become DN. These DN cells are precursors of peripheral DN iNKT cells and appear in the spleen in 1-2 days. Thymic DN iNKT residents are predominantly derived from cells that quickly return from the periphery. The expansion of a very small subset of DN iNKT precursors could also play a small role in this process. These data are an example of measuring T cell maturation in the thymus and show that the maturation dynamics of selected DN iNKT cells fall within the same general time frame as conventional αβ T cells.
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