Abstract
T cell activation is triggered by several hours of contact with peptide–major histocompatibility (MHC) complexes on the surface of antigen-presenting cells (APCs). The nature and location of the sustained signal transduction pathways required for T cell activation are unknown. We show here that the production of phosphatidylinositol(3,4,5)triphosphate (PIP3) was dynamically sustained for hours as T cells responded to antigen. In addition, sustained elevation of PIP3 was essential for T cell proliferation. There was PIP3 accumulation in the T cell–APC contact zone and at the antipodal pole of the cell. The immune synapse is thus not the sole site of sustained signal transduction in activated T cells.
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Acknowledgements
We thank I. Rosewell for injection of transgenic constructs; T. Grafton, S. Hoskins, J. Bee and G. Hutchinson for animal care; and P. Jordan, D. Zicha and J. Monypenny for help with confocal microscopy. Supported by the Fondation pour la Recherche Medicale (M. G.) and Cancer Research UK (P. S. C. and D. A. C.).
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Costello, P., Gallagher, M. & Cantrell, D. Sustained and dynamic inositol lipid metabolism inside and outside the immunological synapse. Nat Immunol 3, 1082–1089 (2002). https://doi.org/10.1038/ni848
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DOI: https://doi.org/10.1038/ni848
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