title: OX40 stimulation by gp34/OX40 ligand enhances productive human immunodeficiency virus type 1 infection.
abstract: OX40 is a member of the tumor necrosis factor (TNF) receptor superfamily and known to be an important costimulatory molecule expressed on activated T cells. To investigate the role of costimulation of OX40 in human immunodeficiency virus type 1 (HIV-1) infection by its natural ligand, gp34, the OX40-transfected ACH-2 cell line, ACH-2/OX40, chronically infected with HIV-1, was cocultured with paraformaldehyde (PFA)-fixed gp34-transfected mouse cell line, SV-T2/gp34. The results showed that HIV-1 production was strongly induced. This was followed by apparent apoptosis, and both processes were specifically inhibited by the gp34-specific neutralizing monoclonal antibody 5A8. Endogenous TNF alpha (TNF-alpha) and TNF-beta production were not involved in the enhanced HIV-1 production. Furthermore, enhanced HIV-1 transcription in gp34-stimulated ACH-2/OX40 cells was dependent on the kappa B site of the HIV-1 long terminal repeat, and the OX40-gp34 interaction activated NF-kappa B consisting of p50 and p65 subunits. When primary activated CD4(+) T cells acutely infected with HIV-1(NL4-3) (CXCR4-using T-cell-line-tropic) were cocultured with PFA-fixed gp34(+) human T-cell leukemia virus type 1-bearing MT-2 cells or SV-T2/gp34 cells, HIV-1 production was also markedly enhanced. The enhancement was again significantly inhibited by 5A8. The present study first shows that OX40-gp34 interaction stimulates HIV-1 expression and suggests that OX40 triggering by gp34 may play an important role in enhancing HIV-1 production in both acutely and latently infected CD4(+) T cells in vivo.
authors: Department of Microbiology, School of Medicine, Tokyo Medical and Dental University, Tokyo 113-8519, Japan.
authors: Y
authors: Y
authors: Takahashi
authors: Y
authors: Y
authors: Tanaka
authors: A
authors: A
authors: Yamashita
authors: Y
authors: Y
authors: Koyanagi
authors: M
authors: M
authors: Nakamura
authors: N
authors: N
authors: Yamamoto
mesh_terms: D000818:Animals; D017209:Apoptosis; D001665:Binding Sites; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000378:metabolism / Q000821:virology*; D002460:Cell Line; D002478:Cells, Cultured; D015967:Gene Expression Regulation, Viral; D016325:HIV Long Terminal Repeat; D015497:HIV-1 / Q000378:metabolism / Q000502:physiology*; D015368:Human T-lymphotropic virus 1; D006801:Humans; D008233:Lymphotoxin-alpha / Q000378:metabolism; D008562:Membrane Glycoproteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D016328:NF-kappa B / Q000378:metabolism; D053278:OX40 Ligand; D053262:Receptors, OX40; D018124:Receptors, Tumor Necrosis Factor; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000235:genetics / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D048069:Tumor Necrosis Factors
chemical_list: D008233:Lymphotoxin-alpha; D008562:Membrane Glycoproteins; D016328:NF-kappa B; 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