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Stomatin-like protein 2 (SLP-2) is a member of the stomatin-prohibitin-flotillin-HflC/K (SPFH) superfamily. Recent evidence indicates that SLP-2 is involved in the organization of cardiolipin-enriched microdomains in mitochondrial membranes and the regulation of mitochondrial biogenesis and function. In T cells, this role translates into enhanced T cell activation. Although the major pool of SLP-2 is associated with mitochondria, we show here that there is an additional pool of SLP-2 associated with the plasma membrane of T cells. Both plasma membrane-associated and mitochondria-associated pools of SLP-2 coalesce at the immunological synapse (IS) upon T cell activation. SLP-2 is not required for formation of IS nor for the re-localization of mitochondria to the IS because SLP-2-deficient T cells showed normal re-localization of these organelles in response to T cell activation. Interestingly, upon T cell activation, we found the surface pool of SLP-2 mostly excluded from the central supramolecular activation complex, and enriched in the peripheral area of the IS where signalling TCR microclusters are located. Based on these results, we propose that SLP-2 facilitates the compartmentalization not only of mitochondrial membranes but also of the plasma membrane into functional microdomains. In this latter location, SLP-2 may facilitate the optimal assembly of TCR signalosome components. Our data also suggest that there may be a net exchange of membrane material between mitochondria and plasma membrane, explaining the presence of some mitochondrial proteins in the plasma membrane.

Original publication

DOI

10.1371/journal.pone.0037144

Type

Journal article

Journal

PLoS ONE

Publication Date

01/2012

Volume

7

Addresses

The Centre for Human Immunology, Robarts Research Institute, and the Department of Microbiology and Immunology, The University of Western Ontario, London, Ontario, Canada.

Keywords

T-Lymphocytes, Jurkat Cells, Cell Membrane, Mitochondria, Animals, Humans, Mice, Blood Proteins, Membrane Proteins, RNA, Small Interfering, Microscopy, Confocal, Immunoprecipitation, Lymphocyte Activation, Plasmids, Immunological Synapses