| First Author | Yu XZ | Year | 2004 |
| Journal | J Immunol | Volume | 172 |
| Issue | 3 | Pages | 1437-43 |
| PubMed ID | 14734719 | Mgi Jnum | J:87651 |
| Mgi Id | MGI:3027377 | Doi | 10.4049/jimmunol.172.3.1437 |
| Citation | Yu XZ, et al. (2004) Lck is required for activation-induced T cell death after TCR ligation with partial agonists. J Immunol 172(3):1437-43 |
| abstractText | TCR engagement can induce either T cell proliferation and differentiation or activation-induced T cell death (AICD) through apoptosis. The intracellular signaling pathways that dictate such a disparate fate after TCR engagement have only been partially elucidated. Non-FcR-binding anti-CD3 mAbs induce a partial agonist TCR signaling pattern and cause AICD on Ag-activated, cycling T cells. In this study, we examined TCR signaling during the induction of AICD by anti-CD3 fos, a non-FcR-binding anti-CD3 mAb. This mAb activates Fyn, Lck, and extracellular signal-regulated kinase, and induces phosphorylation of Src-like adapter protein, despite the inability to cause calcium mobilization or TCR polarization. Anti-CD3 fos also fails to effectively activate zeta-associated protein of 70 kDa or NF-kappaB. Using Ag-specific T cells deficient for Fyn or Lck, we provide compelling evidence that activation of Lck is required for the induction of AICD. Our data indicate that a selective and distinct TCR signaling pattern is required for AICD by TCR partial agonist ligands. |
