Abstract
T cells use secreted soluble factors for highly specific intercellular communication and targeted cell killing. This specificity is achieved first through T cell receptor–mediated recognition of complexes of peptide and major histocompatibility complex displayed by appropriate antigen-presenting cells and then by the directed secretion of cytokines and lytic factors into the immunological synapse between the T cell and antigen-presenting cell. Studies have begun to probe the molecular basis for this synaptic secretion and have also shown that T cells release chemokines and certain inflammatory factors through a multidirectional pathway directed away from the synapse. Thus, the mode of secretion seems to be tailored to the intended function of the secreted molecule.
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Kim Caesar

Kim Caesar
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Acknowledgements
We thank Z. Chai for discussions. Supported by the National Institutes of Health (AI057229 to M.M.D.) and the Howard Hughes Medical Institute (M.M.D.).
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Huse, M., Quann, E. & Davis, M. Shouts, whispers and the kiss of death: directional secretion in T cells. Nat Immunol 9, 1105–1111 (2008). https://doi.org/10.1038/ni.f.215
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DOI: https://doi.org/10.1038/ni.f.215