title: CD28-independent costimulation of T cells by OX40 ligand and CD70 on activated B cells.
abstract: OX40 and its ligand (OX40L) have been implicated in T cell-dependent humoral immune responses. To further characterize the role of OX40/OX40L in T-B cell interaction, we newly generated an anti-mouse OX40L mAb (RM134L) that can inhibit the costimulatory activity of OX40L transfectants for anti-CD3-stimulated T cell proliferation. Flow cytometric analyses using RM134L and an anti-mouse OX40 mAb indicated that OX40 was inducible on splenic T cells by stimulation with immobilized anti-CD3 mAb in a CD28-independent manner, while OX40L was not expressed on resting or activated T cells. OX40L was inducible on splenic B cells by stimulation with anti-IgM Ab plus anti-CD40 mAb, but not by either alone. These activated B cells exhibited a potent costimulatory activity for anti-CD3-stimulated T cell proliferation and IL-2 production. Anti-CD80 and anti-CD86 mAbs partially inhibited the costimulatory activity, and further inhibition was obtained by their combination with RM134L and/or anti-CD70 mAb. We also found the anti-IgM Ab- plus anti-CD40 mAb-stimulated B cells exhibited a potent costimulatory activity for proliferation of and IL-2 production by anti-CD3-stimulated CD28- T cells from CD28-deficient mice, which was substantially inhibited by RM134L and/or anti-CD70 mAb. These results indicated that OX40L and CD70 expressed on surface Ig- and CD40-stimulated B cells can provide CD28-independent costimulatory signals to T cells.
authors.affiliation: Department of Immunology, Juntendo University School of Medicine, Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Akiba
authors.forename: H
authors.initials: H
authors.lastname: Oshima
authors.forename: K
authors.initials: K
authors.lastname: Takeda
authors.forename: M
authors.initials: M
authors.lastname: Atsuta
authors.forename: H
authors.initials: H
authors.lastname: Nakano
authors.forename: A
authors.initials: A
authors.lastname: Nakajima
authors.forename: C
authors.initials: C
authors.lastname: Nohara
authors.forename: H
authors.initials: H
authors.lastname: Yagita
authors.forename: K
authors.initials: K
authors.lastname: Okumura
mesh_terms: D000818:Animals; D019138:Antibodies, Blocking / Q000494:pharmacology; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D015703:Antigens, CD / Q000502:physiology; D001402:B-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D018122:B7-1 Antigen / Q000502:physiology; D051940:B7-2 Antigen; D053282:CD27 Ligand; D018106:CD28 Antigens / Q000235:genetics / Q000502:physiology*; D005260:Female; D008024:Ligands; D008213:Lymphocyte Activation / Q000235:genetics / Q000276:immunology*; D008297:Male; D008562:Membrane Glycoproteins / Q000502:physiology; D008565:Membrane Proteins / Q000502:physiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D018345:Mice, Knockout; D053278:OX40 Ligand; D051381:Rats; D017207:Rats, Sprague-Dawley; D053262:Receptors, OX40; D018124:Receptors, Tumor Necrosis Factor / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000276:immunology / Q000502:physiology*; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D014407:Tumor Cells, Cultured; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000096:biosynthesis / Q000378:metabolism; D048069:Tumor Necrosis Factors
chemical_list: D019138:Antibodies, Blocking; D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; D053282:CD27 Ligand; D018106:CD28 Antigens; C505772:Cd70 protein, mouse; C497965:Cd86 protein, mouse; C497966:Cd86 protein, rat; D008024:Ligands; D008562:Membrane Glycoproteins; D008565:Membrane Proteins; D053278:OX40 Ligand; D053262:Receptors, OX40; D018124:Receptors, Tumor Necrosis Factor; C505717:Tnfrsf4 protein, mouse; C505718:Tnfrsf4 protein, rat; C504586:Tnfsf4 protein, mouse; C504587:Tnfsf4 protein, rat; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7; D048069:Tumor Necrosis Factors