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Critical Reviews™ in Immunology
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ISSN Imprimer: 1040-8401
ISSN En ligne: 2162-6472

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Critical Reviews™ in Immunology

DOI: 10.1615/CritRevImmunol.v26.i3.40
pages 265-290

T-Cell Receptor Signaling Events Triggering Granule Exocytosis

Sasa Radoja
Center for Cancer and Immunology Research, Children's Research Institute, Children's National Medical Center, 111 Michigan Avenue NW, Washington, DC 20010-2970
Alan B. Frey
Department of Cell Biology and Kaplan Cancer Center, New York University School of Medicine, 550 First Avenue, New York, NY 10016
Stanislav Vukmanovic
Center for Cancer and Immunology Research, Children's Research Institute, Children's National Medical Center, 111 Michigan Avenue NW, Washington, DC 20010-2970


T-cell receptor (TCR) engagement by antigen results in proliferation, differentiation and cytokine secretion. In the CD8+ T-cell subset, TCR triggering also induces granule exocytosis, the directional release of contents of lysosome-like granules toward the target cell presenting the antigen. This process is responsible for immediate death of target cells. The intracellular events required for granule exocytosis are distinct from those of proliferation and cytokine secretion, as the former do not require de novo protein synthesis. Consequently, the key TCR signaling events required for granule exocytosis may be distinct. In this article, we review present knowledge of regulation of granule exocytosis by molecules of the TCR signaling cascade.

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