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CD4+ T cell survival is not directly linked to self-MHC–induced TCR signaling

CD4+ T cell survival is not directly linked to self-MHC–induced TCR signaling T cell receptor (TCR) signaling triggered by recognition of self-major histocompatibility complex (MHC) ligands has been proposed to maintain the viability of naïve T cells and to provoke their proliferation in T cell–deficient hosts. Consistent with this, the partially phosphorylated state of TCRζ chains in naïve CD4+ and CD8+ T cells in vivo was found to be actively maintained by TCR interactions with specific peptide-containing MHC molecules. TCR ligand-dependent phosphorylation of TCRζ was lost within one day of cell transfer into MHC-deficient hosts, yet the survival of transferred CD4+ lymphocytes was the same in recipients with or without MHC class II expression for one month. Thus, despite clear evidence for TCR signaling in nonactivated naïve T cells, these data argue against the concept that such signaling plays a predominant role in determining lymphocyte lifespan. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Immunology Springer Journals

CD4+ T cell survival is not directly linked to self-MHC–induced TCR signaling

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References (67)

Publisher
Springer Journals
Copyright
Copyright © 2000 by Nature America Inc.
Subject
Biomedicine; Biomedicine, general; Immunology; Infectious Diseases
ISSN
1529-2908
eISSN
1529-2916
DOI
10.1038/79783
Publisher site
See Article on Publisher Site

Abstract

T cell receptor (TCR) signaling triggered by recognition of self-major histocompatibility complex (MHC) ligands has been proposed to maintain the viability of naïve T cells and to provoke their proliferation in T cell–deficient hosts. Consistent with this, the partially phosphorylated state of TCRζ chains in naïve CD4+ and CD8+ T cells in vivo was found to be actively maintained by TCR interactions with specific peptide-containing MHC molecules. TCR ligand-dependent phosphorylation of TCRζ was lost within one day of cell transfer into MHC-deficient hosts, yet the survival of transferred CD4+ lymphocytes was the same in recipients with or without MHC class II expression for one month. Thus, despite clear evidence for TCR signaling in nonactivated naïve T cells, these data argue against the concept that such signaling plays a predominant role in determining lymphocyte lifespan.

Journal

Nature ImmunologySpringer Journals

Published: Oct 1, 2000

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