International Immunology, Vol. 13, No. 12, 1525-1532,
December 2001
© 2001 Japanese Society for Immunology
TCR dynamics on the surface of living T cells
INSERM U395, Institut Claude de Préval, CHU Purpan, 31059 Toulouse Cedex 3, France
1 Department of Mathematics, University of Warwick, Coventry CV4 7AL, UK
2 Institute of Child Health, University College London, London WC1N 1EH, UK
Correspondence to: S. Valitutti
T lymphocyte activation by specific antigen requires prolonged TCR occupancy and sustained signaling. This is accomplished by the formation of a specialized signaling domain, the immunological synapse, at the T cell–antigen-presenting cell contact site. Surface receptors and signaling components are progressively recruited into this domain where they are organized in defined three-dimensional structures. To better understand how TCR are supplied to the signaling domain during the activation process, we measured (using confocal microscopy and photo-bleaching recovery techniques) lateral mobility of GFP-tagged TCR on living Jurkat cell surface. We show that: (i) surface-expressed TCR exhibit an intrinsic, actin cytoskeleton-independent, lateral mobility which allows them to passively diffuse over the entire T cell surface within ~60 min and (ii) non-stimulated TCR rapidly enter the signaling domain. Our results indicate that TCR lateral mobility per se is sufficient to ensure TCR supply to the immunological synapse in the course of sustained T cell activation.
Keywords: GFP, fusion proteins, lateral mobility, signal transduction
Transmitting editor: D. R. Littman
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