title: Fas ligand costimulates the in vivo proliferation of CD8+ T cells.
abstract: Fas ligand (FasL/CD95L/APO-1L) is one of a growing number of TNF family members whose triggering costimulates maximal proliferation of activated T cells. In this study we show that maximal Ag-dependent accumulation of transferred TCR-transgenic CD8(+) T cells requires Fas (CD95/APO-1) expression by the adoptive hosts. Additionally, adoptively transferred FasL(+) CD8(+) T cells demonstrate a 2-fold advantage in Ag-driven expansion over their FasL(-)counterparts. This study illustrates the in vivo role of TCR-dependent FasL costimulation in the Ag-specific proliferation of both heterogeneous and homogeneous populations of primary CD8(+) T cells and long-term CTL lines. Thus, cross-linking FasL on naive and Ag-experienced CD8(+) T cells whose Ag-specific TCRs are engaged is required to drive maximal cellular proliferation in vivo.
authors.affiliation: Department of Immunology, University of Washington, Seattle, WA 98195, USA.
authors.forename: I
authors.initials: I
authors.lastname: Suzuki
authors.forename: S
authors.initials: S
authors.lastname: Martin
authors.forename: T E
authors.initials: TE
authors.lastname: Boursalian
authors.forename: C
authors.initials: C
authors.lastname: Beers
authors.forename: P J
authors.initials: PJ
authors.lastname: Fink
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D017209:Apoptosis / Q000235:genetics / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology* / Q000378:metabolism / Q000637:transplantation; D048429:Cell Size / Q000276:immunology; D002999:Clone Cells; D003602:Cytotoxicity, Immunologic / Q000235:genetics; D018984:Epitopes, T-Lymphocyte / Q000378:metabolism; D053222:Fas Ligand Protein; D007275:Injections, Intravenous; D008024:Ligands; D008213:Lymphocyte Activation / Q000235:genetics / Q000276:immunology*; D018655:Lymphocyte Count; D017710:Lymphocyte Transfusion; D008562:Membrane Glycoproteins / Q000008:administration & dosage* / Q000096:biosynthesis / Q000502:physiology*; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D019463:Mice, Inbred MRL lpr; D008822:Mice, Transgenic; D013045:Species Specificity; D019014:fas Receptor / Q000378:metabolism*
chemical_list: D018984:Epitopes, T-Lymphocyte; D053222:Fas Ligand Protein; C505658:Fasl protein, mouse; D008024:Ligands; D008562:Membrane Glycoproteins; D019014:fas Receptor