p56lck plays a key role in transducing apoptotic signals in T cells

FEBS Letters

Telford, John L.¹  Nuti, Sandra¹  Di Somma, M.Maddalena²  Baldari, Cosima T.² 

[1] Immunobiology Research Institute Siena (IRIS), Via Fiorentina 1, 53100 Siena, Italy;Department of Evolutionary Biology, University of Siena, Via Mattioli 4, 53100 Siena, Italy

关键词: Apoptosis;    T-cell;    T-cell receptor;    CD4;    Protein tyrosine kinase;    CAT;    chloramphenicol acetyltransferase;    IL-2;    interleukin-2;    Mab;    monoclonal antibody;    MHC;    major histocompatibility complex;    PTK;    protein tyrosine kinase;    TCR;    T-cell antigen receptor;   

DOI  :  10.1016/0014-5793(95)00292-H

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The CD4 receptor synergizes with the T-cell antigen receptor (TCR) in helper T-cell activation. However CD4 crosslinking in the absence of simultaneous TCR engagement leaves the cells primed to activation dependent apoptosis. To assess the role of the CD4 associated protein tyrosine kinase p56lck in CD4 priming to apoptosis we have constructed Jurkat T-cell lines stably transfected with a constitutively active form of p56lck. These cells were constitutively primed to undergo apoptosis upon TCR crosslinking with specific antibodies. In addition the Jurkat JCaM1 line, which is defective for p56lck expression, was resistant to TCR induced apoptosis. These data indicate that p56lck is required for T-cell apoptosis and that CD4 priming of T-cells for antigen dependent apoptosis is due to inappropriate or partial activation of the p56lck signal transduction pathway.

【 授权许可】

Unknown