title: Costimulation of CD8 T cell responses by OX40.
abstract: The persistence of functional CD8 T cell responses is dependent on checkpoints established during priming. Although naive CD8 cells can proliferate with a short period of stimulation, CD4 help, inflammation, and/or high peptide affinity are necessary for the survival of CTL and for effective priming. Using OX40-deficient CD8 cells specific for a defined Ag, and agonist and antagonist OX40 reagents, we show that OX40/OX40 ligand interactions can determine the extent of expansion of CD8 T cells during responses to conventional protein Ag and can provide sufficient signals to confer CTL-mediated protection against tumor growth. OX40 signaling primarily functions to maintain CTL survival during the initial rounds of cell division after Ag encounter. Thus, OX40 is one of the costimulatory molecules that can contribute signals to regulate the accumulation of Ag-reactive CD8 cells during immune responses.
authors.affiliation: Division of Molecular Immunology, La Jolla Institute for Allergy and Immunology, San Diego, CA 92121, USA.
authors.forename: Pratima
authors.initials: P
authors.lastname: Bansal-Pakala
authors.forename: Beth S
authors.initials: BS
authors.lastname: Halteman
authors.forename: Mary Huey-Yu
authors.initials: MH
authors.lastname: Cheng
authors.forename: Michael
authors.initials: M
authors.lastname: Croft
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism* / Q000637:transplantation; D002449:Cell Aggregation / Q000276:immunology; D002455:Cell Division / Q000235:genetics / Q000276:immunology; D002470:Cell Survival / Q000235:genetics / Q000276:immunology; D003602:Cytotoxicity, Immunologic / Q000235:genetics; D007111:Immunity, Cellular / Q000235:genetics; D008213:Lymphocyte Activation / Q000235:genetics / Q000276:immunology*; D008231:Lymphopenia / Q000235:genetics / Q000276:immunology; D008562:Membrane Glycoproteins / Q000378:metabolism* / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D053278:OX40 Ligand; D010534:Peritoneal Neoplasms / Q000235:genetics / Q000276:immunology / Q000473:pathology; D053262:Receptors, OX40; D018124:Receptors, Tumor Necrosis Factor / Q000172:deficiency / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D015398:Signal Transduction / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000166:cytology / Q000276:immunology; D048069:Tumor Necrosis Factors
chemical_list: D008562:Membrane Glycoproteins; D053278:OX40 Ligand; D053262:Receptors, OX40; D018124:Receptors, Tumor Necrosis Factor; C505717:Tnfrsf4 protein, mouse; C504586:Tnfsf4 protein, mouse; D048069:Tumor Necrosis Factors