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The role of PI3K activity in T lymphocyte development is obscure because mice deficient in single PI3K catalytic subunits either die before birth (p110alpha-/- and p110beta-/-) or lack a significant T cell developmental phenotype (p110gamma-/- and p110delta-/-). We have generated mice deficient in both p110gamma and p110delta and show that p110gamma/delta-/- mice have a profound block in T cell development that occurs at the beta-selection checkpoint. We show that pre-TCR-induced signaling is significantly reduced in p110gamma/delta-/- thymocytes and that this results in a concomitant lack of proliferative expansion and increased apoptosis. The survival defect in p110gamma/delta-/- thymocytes is associated with increased levels of the pro-apoptotic molecule Bcl2 interacting mediator of cell death. This work demonstrates that PI3K activity is critical for T cell development and depends on the combined function of p110gamma and p110delta.


Journal article


J Immunol

Publication Date





2783 - 2787


Animals, Catalytic Domain, Mice, Phosphatidylinositol 3-Kinases, Receptors, Antigen, T-Cell, Signal Transduction, T-Lymphocytes