title: Molecular characterization of murine and human OX40/OX40 ligand systems: identification of a human OX40 ligand as the HTLV-1-regulated protein gp34.
abstract: A ligand was cloned for murine OX40, a member of the TNF receptor family, using a T cell lymphoma cDNA library. The ligand (muOX40L) is a type II membrane protein with significant identity to human gp34 (gp34), a protein whose expression on HTLV-1-infected human leukemic T cells is regulated by the tax gene. The predicted structures of muOX40L and gp34 are similar to, but more compact than, those of other ligands of the TNF family. Mapping of the muOX40L gene revealed tight linkage to gld, the FasL gene, on chromosome 1. gp34 maps to a homologous region in the human genome, 1q25. cDNAs for human OX40 receptor were cloned by cross-hybridization with muOX40, and gp34 was found to bind the expressed human receptor. Lymphoid expression of muOX40L was detected on activated T cells, with higher levels found on CD4+ rather than CD8+ cells. The cell-bound recombinant ligands are biologically active, co-stimulating T cell proliferation and cytokine production. Strong induction of IL-4 secretion by muOX40L suggests that this ligand may play a role in regulating immune responses. In addition, the HTLV-1 regulation of gp34 suggests a possible connection between virally induced pathogenesis and the OX40 system.
authors.affiliation: Department of Gene Expression, Immunex R&D Corporation, Seattle, WA 98101.
authors.forename: P R
authors.initials: PR
authors.lastname: Baum
authors.forename: R B
authors.initials: RB
authors.lastname: Gayle
authors.forename: F
authors.initials: F
authors.lastname: Ramsdell
authors.forename: S
authors.initials: S
authors.lastname: Srinivasan
authors.forename: R A
authors.initials: RA
authors.lastname: Sorensen
authors.forename: M L
authors.initials: ML
authors.lastname: Watson
authors.forename: M F
authors.initials: MF
authors.lastname: Seldin
authors.forename: E
authors.initials: E
authors.lastname: Baker
authors.forename: G R
authors.initials: GR
authors.lastname: Sutherland
authors.forename: K N
authors.initials: KN
authors.lastname: Clifford
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000954:Antigens, Surface; D001483:Base Sequence; D002874:Chromosome Mapping; D002878:Chromosomes, Human, Pair 1; D003001:Cloning, Molecular; D016207:Cytokines / Q000096:biosynthesis; D005260:Female; D005786:Gene Expression Regulation; D015368:Human T-lymphotropic virus 1 / Q000378:metabolism; D006801:Humans; D008024:Ligands; D008562:Membrane Glycoproteins; D008565:Membrane Proteins; D051379:Mice; D008810:Mice, Inbred C57BL; D008958:Models, Molecular; D008969:Molecular Sequence Data; D053278:OX40 Ligand; D053262:Receptors, OX40; D018124:Receptors, Tumor Necrosis Factor / Q000235:genetics* / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013601:T-Lymphocytes / Q000378:metabolism; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000235:genetics / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics* / Q000378:metabolism*; D048069:Tumor Necrosis Factors
chemical_list: D000954:Antigens, Surface; D016207:Cytokines; D008024:Ligands; D008562:Membrane Glycoproteins; D008565:Membrane Proteins; D053278:OX40 Ligand; D053262:Receptors, OX40; D018124:Receptors, Tumor Necrosis Factor; D011993:Recombinant Fusion Proteins; C505716:TNFRSF4 protein, human; C089251:TNFSF4 protein, human; C505717:Tnfrsf4 protein, mouse; C504586:Tnfsf4 protein, mouse; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7; D014409:Tumor Necrosis Factor-alpha; D048069:Tumor Necrosis Factors