title: Requirement for Shc in TCR-mediated activation of a T cell hybridoma.
abstract: Engagement of the TCR determines the fate of T cells to activate their functional programs, proliferate, or undergo apoptosis. The intracellular signal transduction pathways that dictate the specific outcome of receptor engagement have only been partially elucidated. The adapter protein, Shc, is involved in cytokine production, mitogenesis, transformation, and apoptosis in different cell systems. We found that Shc becomes phosphorylated on tyrosine residues upon stimulation of the TCR in DO11.10 hybridoma T cells; therefore, we investigated the role of Shc in activation-induced cell death in these cells by creating a series of stably transfected cell lines. Expression of Shc-SH2 (the SH2 domain of Shc) or Shc-Y239/240F (full-length Shc in which tyrosines 239 and 240 have been mutated to phenylalanine) resulted in the inhibition of activation-induced cell death and Fas ligand up-regulation after TCR cross-linking. Expression of wild-type Shc or Shc-Y317F had no significant effect. In addition, we found that Shc-SH2 and Shc-Y239/240F, but not Shc-Y317F, inhibited phosphorylation of extracellular signal-regulated protein kinase and production of IL-2 after TCR cross-linking. These results indicate an important role for Shc in the early signaling events that lead to activation-induced cell death and IL-2 production after TCR activation.
authors.affiliation: Division of Pediatric Oncology, Dana-Farber Cancer Institute, Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: J C
authors.initials: JC
authors.lastname: Pratt
authors.forename: M R
authors.initials: MR
authors.lastname: van den Brink
authors.forename: V E
authors.initials: VE
authors.lastname: Igras
authors.forename: S F
authors.initials: SF
authors.lastname: Walk
authors.forename: K S
authors.initials: KS
authors.lastname: Ravichandran
authors.forename: S J
authors.initials: SJ
authors.lastname: Burakoff
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport; D000818:Animals; D017209:Apoptosis / Q000235:genetics / Q000276:immunology; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D002460:Cell Line; D053222:Fas Ligand Protein; D051380:GRB2 Adaptor Protein; D006825:Hybridomas; D007376:Interleukin-2 / Q000096:biosynthesis; D008024:Ligands; D008213:Lymphocyte Activation / Q000276:immunology*; D008562:Membrane Glycoproteins / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D051379:Mice; D009154:Mutation; D010766:Phosphorylation; D017354:Point Mutation; D014176:Protein Biosynthesis; D011506:Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D017260:Receptor-CD3 Complex, Antigen, T-Cell / Q000276:immunology / Q000378:metabolism; D011948:Receptors, Antigen, T-Cell / Q000276:immunology / Q000378:metabolism / Q000502:physiology*; D055765:Shc Signaling Adaptor Proteins; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D014162:Transfection; D019014:fas Receptor / Q000378:metabolism; D018909:src Homology Domains / Q000276:immunology*
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport; D053222:Fas Ligand Protein; C505658:Fasl protein, mouse; D051380:GRB2 Adaptor Protein; C495949:Grb2 protein, mouse; D007376:Interleukin-2; D008024:Ligands; D008562:Membrane Glycoproteins; D011506:Proteins; D017260:Receptor-CD3 Complex, Antigen, T-Cell; D011948:Receptors, Antigen, T-Cell; D055765:Shc Signaling Adaptor Proteins; C528034:Shc1 protein, mouse; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D019014:fas Receptor; D017871:Calcium-Calmodulin-Dependent Protein Kinases