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• W2017251010 abstract "Although T cell receptor (TCR) signals are essential for intrathymic T cell-positive selection, it remains controversial whether they only serve to initiate this process, or whether they are required throughout to promote thymocyte differentiation and survival. To address this issue, we have devised a novel approach to interfere with thymocyte TCR signaling in a developmental stage-specific manner in vivo. We have reconstituted mice deficient for Zap70, a tyrosine kinase required for TCR signaling and normally expressed throughout T cell development, with a Zap70 transgene driven by the adenosine deaminase (ADA) gene enhancer, which is active in CD4(+)CD8(+) thymocytes but inactive in CD4(+) or CD8(+) single-positive (SP) thymocytes. In such mice, termination of Zap70 expression impaired TCR signal transduction and arrested thymocyte development after the initiation, but before the completion, of positive selection. Arrested thymocytes had terminated Rag gene expression and up-regulated TCR and Bcl-2 expression, but failed to differentiate into mature CD4 or CD8 SP thymocytes, to be rescued from death by neglect or to sustain interleukin 7R alpha expression. These observations identify a TCR-dependent proofreading mechanism that verifies thymocyte TCR specificity and differentiation choices before the completion of positive selection." @default.
• W2017251010 created "2016-06-24" @default.
• W2017251010 creator A5011102873 @default.
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• W2017251010 creator A5086200287 @default.
• W2017251010 date "2003-02-03" @default.
• W2017251010 modified "2023-09-23" @default.
• W2017251010 title "Restricting Zap70 Expression to CD4+CD8+ Thymocytes Reveals a T Cell Receptor–dependent Proofreading Mechanism Controlling the Completion of Positive Selection" @default.
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• W2017251010 doi "https://doi.org/10.1084/jem.20021698" @default.
• W2017251010 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2193832" @default.
• W2017251010 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12566420" @default.
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