Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/57533
Title: T cell receptor internalization from the immunological synapse is mediated by TC21 and RhoG GTPase-dependent phagocytosis
Authors: Martínez Martín, Nuria, Fernández-Arenas, Elena, Delgado, Pilar, Bustelo, Xosé R., Alarcón, Balbino
Keywords: Immunological synapse
T cell receptor
Issue Date: 26-Aug-2011
Publisher: Elsevier
Abstract: The immunological synapse (IS) serves a dual role for sustained T cell receptor (TCR) signaling and for TCR downregulation. TC21 (Rras2) is a RRas subfamily GTPase that constitutively associates with the TCR and is implicated in tonic TCR signaling by activating phosphatidylinositol 3-kinase. In this study, we demonstrate that TC21 both cotranslocates with the TCR to the IS and is necessary for TCR internalization from the IS through a mechanism dependent on RhoG, a small GTPase previously associated with phagocytosis. Indeed, we found that the TCR triggers T cells to phagocytose 1–6 μm beads through a TC21- and RhoG-dependent pathway. We further show that TC21 and RhoG are necessary for the TCR-promoted uptake of major histocompatibility complex (MHC) from antigen-presenting cells. Therefore, TC21 and RhoG dependence underlie the existence of a common phagocytic mechanism that drives TCR internalization from the IS together with its peptide-MHC ligand.
Publisher version (URL): http://dx.doi.org/10.1016/j.immuni.2011.06.003
URI: http://hdl.handle.net/10261/57533
ISSN: 1074-7613
Citation: Immunity 35(2): 208–222 (2011)
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