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• W1756551197 endingPage "6151" @default.
• W1756551197 startingPage "6142" @default.
• W1756551197 abstract "Abstract The Tec family tyrosine kinase Itk is critical for efficient signaling downstream of the TCR. Biochemically, Itk is directly phosphorylated and activated by Lck. Subsequently, Itk activates phospholipase C-γ1, leading to calcium mobilization and extracellular signal-regulated kinase/mitogen-activated protein kinase activation. These observations suggested that Itk might play an important role in positive selection and CD4/CD8 lineage commitment during T cell development in the thymus. To test this, we crossed Itk-deficient mice to three lines of TCR transgenics and analyzed progeny on three different MHC backgrounds. Analysis of these mice revealed that fewer TCR transgenic T cells develop in the absence of Itk. In addition, examination of multiple T cell development markers indicates that multiple stages of positive selection are affected by the absence of Itk, but the T cells that do develop appear normal. In contrast to the defects in positive selection, CD4/CD8 lineage commitment seems to be intact in all the TCR transgenic itk−/− lines tested. Overall, these data indicate that altering TCR signals by the removal of Itk does not affect the appropriate differentiation of thymocytes based on their MHC specificity, but does impact the efficiency with which thymocytes complete their maturation process." @default.
• W1756551197 created "2016-06-24" @default.
• W1756551197 creator A5059963748 @default.
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• W1756551197 date "2002-06-15" @default.
• W1756551197 modified "2023-10-13" @default.
• W1756551197 title "The Absence of Itk Inhibits Positive Selection Without Changing Lineage Commitment" @default.
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• W1756551197 doi "https://doi.org/10.4049/jimmunol.168.12.6142" @default.
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