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• W2476524461 endingPage "1753" @default.
• W2476524461 startingPage "1743" @default.
• W2476524461 abstract "T cell development is dependent on the migration of progenitor cells from the bone marrow to the thymus. Upon reaching the thymus, progenitors undergo a complex developmental program that requires inputs from various highly conserved signaling pathways including the Notch and Wnt pathways. To date, Ras signaling has not been implicated in the very earliest stages of T cell differentiation, but members of a family of Ras activators called RasGRPs have been shown to be involved at multiple stages of T cell development. We examined early T cell development in mice lacking RasGRP1, RasGRP3, and RasGRPs 1 and 3. We report that RasGRP1- and RasGRP3-deficient thymi show significantly reduced numbers of early thymic progenitors (ETPs) relative to wild type thymi. Furthermore, RasGRP1/3 double-deficient thymi show significant reductions in ETP numbers compared with either RasGRP1 or RasGRP3 single-deficient thymi, suggesting that both RasGRP1 and RasGRP3 regulate the generation of ETPs. In addition, competitive bone marrow chimera experiments reveal that RasGRP1/3 double-deficient progenitors intrinsically generate ETPs less efficiently than wild type progenitors. Finally, RasGRP1/3-deficient progenitors show impaired migration toward the CCR9 ligand, CCL25, suggesting that RasGRP1 and RasGRP3 may regulate progenitor entry into the thymus through a CCR9-dependent mechanism. These data demonstrate that, in addition to Notch and Wnt, the highly conserved Ras pathway is critical for the earliest stages of T cell development and further highlight the importance of Ras signaling during thymocyte maturation." @default.
• W2476524461 created "2016-08-23" @default.
• W2476524461 creator A5014197793 @default.
• W2476524461 creator A5027108566 @default.
• W2476524461 creator A5064090852 @default.
• W2476524461 date "2016-07-27" @default.
• W2476524461 modified "2023-10-10" @default.
• W2476524461 title "RasGRP1 and RasGRP3 Are Required for Efficient Generation of Early Thymic Progenitors" @default.
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• W2476524461 doi "https://doi.org/10.4049/jimmunol.1502107" @default.
• W2476524461 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27465532" @default.
• W2476524461 hasPublicationYear "2016" @default.
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