title: CD4 is a critical component of the receptor for human herpesvirus 7: interference with human immunodeficiency virus.
abstract: In this study, we demonstrate that the glycoprotein CD4, a member of the immunoglobulin superfamily, is a critical component of the receptor for human herpesvirus 7 (HHV-7), a recently discovered T-lymphotropic human herpesvirus. A selective and progressive downregulation of the surface membrane expression of CD4 was observed in human CD4+ T cells in the course of HHV-7 infection. Various murine monoclonal antibodies to CD4 and the recombinant soluble form of human CD4 caused a dose-dependent inhibition of HHV-7 infection in primary CD4+ T lymphocytes. Moreover, radiolabeled HHV-7 specifically bound to cervical carcinoma cells (HeLa) expressing human CD4. A marked carcinoma cells (HeLa) expressing human CD4. A marked reciprocal interference was observed between HHV-7 and human immunodeficiency virus (HIV), the retrovirus that causes the acquired immunodeficiency syndrome and also uses CD4 as a receptor. Previous exposure of CD4+ T cells to HHV-7 dramatically interfered with infection by both primary and in vitro-passaged HIV-1 isolates. Reciprocally, persistent infection with HIV-1 or treatment with the soluble form of gp120, the CD4-binding envelope glycoprotein of HIV-1, rendered CD4+ T cells resistant to HHV-7 infection. These data indicate that CD4 is critically involved in the receptor mechanism for HHV-7. The antagonistic effect between HHV-7 and HIV could be exploited to devise therapeutic approaches to AIDS.
authors.affiliation: Laboratory of Tumor Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.
authors.forename: P
authors.initials: P
authors.lastname: Lusso
authors.forename: P
authors.initials: P
authors.lastname: Secchiero
authors.forename: R W
authors.initials: RW
authors.lastname: Crowley
authors.forename: A
authors.initials: A
authors.lastname: Garzino-Demo
authors.forename: Z N
authors.initials: ZN
authors.lastname: Berneman
authors.forename: R C
authors.initials: RC
authors.lastname: Gallo
mesh_terms: D001667:Binding, Competitive; D015704:CD4 Antigens / Q000378:metabolism*; D015496:CD4-Positive T-Lymphocytes / Q000382:microbiology*; D015536:Down-Regulation; D015658:HIV Infections / Q000382:microbiology; D015497:HIV-1 / Q000378:metabolism*; D006566:Herpesviridae Infections / Q000382:microbiology*; D016199:Herpesvirus 7, Human / Q000378:metabolism*; D006801:Humans; D011991:Receptors, Virus / Q000378:metabolism*; D014762:Viral Interference
chemical_list: D015704:CD4 Antigens; D011991:Receptors, Virus