Abstract
Notch proteins regulate many developmental processes. Notch1 is highly expressed on thymocytes, but its role in regulating their development is not known. We show that activation of Notch1 signaling in CD4+CD8+ double positive thymocytes promotes the maturation of both CD4+ and CD8+ single positive thymocytes and that this occurs in the absence of interactions between the T cell receptor and MHC molecules expressed on thymic epithelial cells. We have also identified several genes that are transcriptionally regulated by Notch1 in T cells and show that they are upregulated during maturation into both single positive lineages. These observations suggest that Notch1 signaling plays a role in promoting maturation into both the CD4 and CD8 T cell lineages.
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