Mohammad Zulfiquer Hossain

?-catenin, Tcf, and Icat: Novel Roles in T Cell Development, Function, and Aging Mohammad Zulfiquer Hossain

In addition to working together to drive expression of target genes, ?-catenin and TCF often work independently of each other. They both regulate several stages of T cell development, but their mode of action remains poorly understood. To study the specific role of ?-catenin-TCF interactions in T cells, we generated transgenic mice that express ICAT, a naturally occurring inhibitor of ?-catenin-TCF interactions, in the T cell lineage. We found that ?-catenin-TCF interactions are important for thymocyte survival, but not for proliferation or differentiation. Interestingly, thymocyte aging slows down in ICAT-Tg mice, suggesting a role for ?-catenin-TCF interactions in normal thymic involution. We also discovered that ?-catenin-TCF interactions provide survival signals to activated T cells and promote differentiation of activated CD4 T cells into the default Th2 lineage. However, TCF represses Th1 differentiation independently of its interaction with ?-catenin. This study, thus, provides novel insights into the role of ?-catenin and TCF in T cell development, function, and aging, and should of interest to immunologists, developmental biologists, and gerontologists alike.