The Eδ enhancer controls the generation of CD4−CD8− αβTCR-expressing T cells that can give rise to different lineages of αβ T cells
نویسندگان
چکیده
It is well established that the pre-T cell receptor for antigen (TCR) is responsible for efficient expansion and differentiation of thymocytes with productive TCRbeta rearrangements. However, Ptcra- as well as Tcra-targeting experiments have suggested that the early expression of Tcra in CD4- CD8- cells can partially rescue the development of alphabeta CD4+ CD8+ cells in Ptcra-deficient mice. In this study, we show that the TCR E delta but not E alpha enhancer function is required for the cell surface expression of alphabetaTCR on immature CD4- CD8- T cell precursors, which play a crucial role in promoting alphabeta T cell development in the absence of pre-TCR. Thus, alphabetaTCR expression by CD4- CD8- thymocytes not only represents a transgenic artifact but occurs under physiological conditions.
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عنوان ژورنال:
- The Journal of Experimental Medicine
دوره 203 شماره
صفحات -
تاریخ انتشار 2006