title: Cutting edge: a critical role for CD70 in CD8 T cell priming by CD40-licensed APCs.
abstract: The CD154/CD40 interaction is an important pathway of CD4 T cell help for CD8 T cell responses. In this study, we address the role of CD70, a member of the TNF superfamily and the ligand for the T cell costimulatory receptor CD27, in CD40-mediated priming of CD8 T cells. Using an agonistic anti-CD40 mAb to mimic the CD154/CD40 interaction we demonstrate that the priming of OT-I TCR transgenic or endogenous mouse OVA-specific CD8 T cells is critically dependent on CD70/CD27 interaction. CD70 blockade inhibited CD40-mediated clonal expansion of CD8 T cells and reduced the number of memory CD8 T cells generated. Furthermore, CD70 blockade during the initial priming of CD8 T cells inhibited the ability of memory CD8 T cells to expand in response to a second encounter with Ag. Our data indicate that CD70 expression on APCs plays a key role in CD40-dependent CD8 T cell responses.
authors.affiliation: Cancer Sciences Division, Tenovus Research Laboratory, University of Southampton School of Medicine, Southampton General Hospital, Southampton, United Kingdom.
authors.forename: Vadim Y
authors.initials: VY
authors.lastname: Taraban
authors.forename: Tania F
authors.initials: TF
authors.lastname: Rowley
authors.forename: Aymen
authors.initials: A
authors.lastname: Al-Shamkhani
mesh_terms: D000818:Animals; D019138:Antibodies, Blocking / Q000494:pharmacology; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D000938:Antigen-Presenting Cells / Q000276:immunology* / Q000378:metabolism*; D015703:Antigens, CD / Q000096:biosynthesis / Q000276:immunology / Q000502:physiology*; D053282:CD27 Ligand; D019013:CD40 Antigens / Q000276:immunology / Q000502:physiology*; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology* / Q000378:metabolism*; D002454:Cell Differentiation / Q000235:genetics / Q000276:immunology; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000276:immunology / Q000378:metabolism; D018984:Epitopes, T-Lymphocyte / Q000276:immunology; D006131:Growth Inhibitors / Q000494:pharmacology; D007156:Immunologic Memory / Q000235:genetics; D008213:Lymphocyte Activation / Q000235:genetics / Q000276:immunology; D008565:Membrane Proteins / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000276:immunology / Q000502:physiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D010047:Ovalbumin / Q000276:immunology
chemical_list: D019138:Antibodies, Blocking; D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D053282:CD27 Ligand; D019013:CD40 Antigens; C505772:Cd70 protein, mouse; D018984:Epitopes, T-Lymphocyte; D006131:Growth Inhibitors; D008565:Membrane Proteins; D010047:Ovalbumin