-Catenin Expression Enhances Il-7 Receptor Signaling in Thymocytes during Positive Selection

Yu, Q.; Xu, M.; Sen, J.M.

The Journal of Immunology 179(1): 126-131


DOI: 10.4049/jimmunol.179.1.126
Accession: 068490632

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Differentiation of CD4+CD8+ double-positive thymocytes into CD8+ single-positive (SP) thymocytes is regulated by TCR and cytokine receptor signals. Previously, we have shown that expression of stabilized beta-catenin, the major transcriptional cofactor of T cell factor, results in increase in both CD4SP and CD8SP thymocytes with a preferential effect on CD8SP thymocytes. In this report, using mice expressing stabilized beta-catenin and mice with T cell specific deletion of beta-catenin, we show that beta-catenin expression augments IL-7Ralpha-chain expression and down-regulates suppressor of cytokine signaling-1 expression in thymocytes undergoing positive selection. Consequently, beta-catenin expression augments IL-7R signaling in thymocytes during positive selection and promotes the development of CD8SP thymocytes.