title: Antibody mediated enhancement of HIV-1 infection of an EBV transformed B cell line is CD4 dependent.
abstract: Low levels of anti-viral antibodies may facilitate virus infection of Fc-receptor bearing cells. For human immunodeficiency virus (HIV) it has been reported that antibodies can enhance infection of phagocytic cells. We show that HIV-1 can infect an Epstein-Barr virus transformed B cell line and that low levels of anti-HIV antibodies enhance infection. The enhanced infection was characterized by an increase in viral DNA and increased HIV p24 protein production. Detection of cell surface antigen expression of CD4, the receptor for HIV, Fc-receptor type II for IgG, but not of type I and III could be demonstrated by immunofluorescence cytometry. The enhancement was abrogated when infection was performed in presence of a monoclonal antibody directed against CD4. Based on these results we conclude that antibody mediated enhancement of HIV-1 infection can also occur in non-phagocytic cells in a CD4 dependent manner and that IgG Fc-receptors other than types I or III are involved in this process.
authors.affiliation: Eijkman-Winkler Laboratory for Medical Microbiology, University of Utrecht, The Netherlands.
authors.forename: H S
authors.initials: HS
authors.lastname: Nottet
authors.forename: I
authors.initials: I
authors.lastname: Janse
authors.forename: N M
authors.initials: NM
authors.lastname: De Vos
authors.forename: L J
authors.initials: LJ
authors.lastname: Bakker
authors.forename: M R
authors.initials: MR
authors.lastname: Visser
authors.forename: J
authors.initials: J
authors.lastname: Verhoef
mesh_terms: D001402:B-Lymphocytes; D001483:Base Sequence; D015704:CD4 Antigens; D002461:Cell Line, Transformed; D004279:DNA, Viral / Q000235:genetics; D015483:HIV Antibodies; D016655:HIV Core Protein p24 / Q000096:biosynthesis; D015658:HIV Infections / Q000209:etiology / Q000276:immunology*; D015497:HIV-1 / Q000235:genetics / Q000276:immunology; D006801:Humans; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction
chemical_list: D015704:CD4 Antigens; D004279:DNA, Viral; D015483:HIV Antibodies; D016655:HIV Core Protein p24