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Heissmeyer, V.* ; Macián, F.* ; Im, S.H.* ; Varma, R.* ; Feske, S.* ; Venuprasad, K.* ; Gu, H.* ; Liu, Y.C.* ; Dustin, M.L.* ; Rao, A.*

Calcineurin imposes T cell unresponsiveness through targeted proteolysis of signaling proteins.

Nat. Immunol. 5, 255-65 (2004)
DOI PMC
Open Access Green as soon as Postprint is submitted to ZB.
Sustained calcium signaling induces a state of anergy or antigen unresponsiveness in T cells, mediated through calcineurin and the transcription factor NFAT. We show here that Ca(2+)-induced anergy is a multistep program that is implemented at least partly through proteolytic degradation of specific signaling proteins. Calcineurin increased mRNA and protein of the E3 ubiquitin ligases Itch, Cbl-b and GRAIL and induced expression of Tsg101, the ubiquitin-binding component of the ESCRT-1 endosomal sorting complex. Subsequent stimulation or homotypic cell adhesion promoted membrane translocation of Itch and the related protein Nedd4, resulting in degradation of two key signaling proteins, PKC-theta and PLC-gamma1. T cells from Itch- and Cbl-b-deficient mice were resistant to anergy induction. Anergic T cells showed impaired calcium mobilization after TCR triggering and were unable to maintain a mature immunological synapse, instead showing late disorganization of the outer ring containing lymphocyte function-associated antigen 1. Our results define a complex molecular program that links gene transcription induced by calcium and calcineurin to a paradoxical impairment of signal transduction in anergic T cells.
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Publication type Article: Journal article
Document type Scientific Article
Language english
Publication Year 2004
HGF-reported in Year 0
ISSN (print) / ISBN 1529-2908
e-ISSN 1529-2916
Journal Nature Immunology
Quellenangaben Volume: 5, Issue: 3, Pages: 255-65 Article Number: , Supplement: ,
Publisher Nature Publishing Group
Reviewing status Peer reviewed
Institute(s) Institute of Molecular Immunology (IMI)
Research Unit Molecular Immune Regulation (AMIR)
POF-Topic(s) 30504 - Mechanisms of Genetic and Environmental Influences on Health and Disease
Research field(s) Immune Response and Infection
PSP Element(s) G-501792-001
PubMed ID 14973438
DOI 10.1038/ni1047
WOS ID 000189344600008
Erfassungsdatum 2004-02-15
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