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J Immunol. 1995 Dec 1;155(11):5083-7.

Defective TCR-mediated signaling in anergic T cells.

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  • 1First Department of Internal Medicine, Nagasaki University School of Medicine, Japan.

Erratum in

  • J Immunol 1996 Apr 15;156(8):following 3088.

Abstract

Extrathymic T cell tolerance to Ags can be achieved through clonal deletion by activation-induced programmed cell death as well as by functional unresponsiveness (anergy) of Ag reactive-T cells. Previous studies demonstrated that in vivo administration of staphylococcal enterotoxin B (SEB) induces SEB-specific T cell anergy. To investigate the molecular mechanisms of T cell anergy, we analyzed the TCR-mediated signal transduction in normal and anergic T cells. Anergic T cells exhibited impaired protein tyrosine phosphorylation on TCR-mediated stimulation. The altered tyrosine phosphorylation in anergic T cells may be caused by a defect in tyrosine phosphorylation of TCR zeta-chain and its subsequent association with ZAP-70 tyrosine kinase. Our data demonstrated that TCR zeta-chain phosphorylation and its sequential interaction with ZAP-70 are essential for the initiation of TCR-mediated signal transduction.

PMID:
7594516
[PubMed - indexed for MEDLINE]
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