Staging and resetting T cell activation in SMACs.

Abstract:

:During the productive interaction of T cells with antigen-presenting cells (APCs), engaged receptors, including the T cell antigen receptors and their associated tyrosine kinases, assemble into spatially segregated supramolecular activation clusters (SMACs) at the area of cell contact. Here, we studied intracellular signaling in SMACs by three-dimensional immunofluorescence microscopic localization of CD3, CD45, talin, phosphotyrosine, Lck and phosphorylated ZAP-70 in T cell-APC conjugates. Two distinct phases of spatial-temporal activation, one before and one after SMAC formation, which were separated by a brief state of inactivation caused by CD45, were observed at the T cell-APC contact area. We propose that pre-SMAC signals are sufficient to activate cell adhesion, but not productive T cell responses, which require orchestrated signaling in SMACs.

journal_name

Nat Immunol

journal_title

Nature immunology

authors

Freiberg BA,Kupfer H,Maslanik W,Delli J,Kappler J,Zaller DM,Kupfer A

doi

10.1038/ni836

keywords:

subject

Has Abstract

pub_date

2002-10-01 00:00:00

pages

911-7

issue

10

eissn

1529-2908

issn

1529-2916

pii

ni836

journal_volume

3

pub_type

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