title: HIV-1 tropism for mononuclear phagocytes can be determined by regions of gp120 outside the CD4-binding domain.
abstract: Cells of the mononuclear phagocyte system are the predominant cell producing HIV-1 in most tissues including the central nervous system (CNS), spinal cord, lung and skin; infection is associated with dementia, neuropathy, pneumonitis, and dermatitis respectively. Different HIV-1 isolates vary markedly in their ability to infect mononuclear phagocytes productively. Here we describe molecular clones of a CNS-derived isolate, HIV-1(JR-FL), which can replicate efficiently in mononuclear phagocytes. Analysis by polymerase chain reaction of early events after infection indicates that the early phase of viral replication before reverse transcription determines tropism. Genetic mapping of the macrophage-tropic phenotype by construction of recombinant viruses indicates that mononuclear phagocyte infectivity can be determined by a 157-amino-acid region of the gp 120 glycoprotein of HIV-1(JR-FL). Significantly, this region is upstream from the previously defined CD4-binding domain. We propose that at least one determinant for mononuclear phagocyte tropism involves target cell interactions with regions of gp120 distinct from the CD4-binding domain.
authors.affiliation: Department of Medicine, West Los Angeles Veteran's Administration Medical Center, UCLA School of Medicine, 90073.
authors.forename: W A
authors.initials: WA
authors.lastname: O'Brien
authors.forename: Y
authors.initials: Y
authors.lastname: Koyanagi
authors.forename: A
authors.initials: A
authors.lastname: Namazie
authors.forename: J Q
authors.initials: JQ
authors.lastname: Zhao
authors.forename: A
authors.initials: A
authors.lastname: Diagne
authors.forename: K
authors.initials: K
authors.lastname: Idler
authors.forename: J A
authors.initials: JA
authors.lastname: Zack
authors.forename: I S
authors.initials: IS
authors.lastname: Chen
mesh_terms: D015526:AIDS Dementia Complex / Q000382:microbiology; D000595:Amino Acid Sequence; D001665:Binding Sites; D001921:Brain / Q000382:microbiology; D015704:CD4 Antigens / Q000235:genetics / Q000502:physiology*; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004274:DNA, Recombinant; D004279:DNA, Viral / Q000235:genetics; D015699:HIV Envelope Protein gp120 / Q000235:genetics / Q000502:physiology*; D015497:HIV-1 / Q000235:genetics / Q000502:physiology*; D006801:Humans; D008969:Molecular Sequence Data; D010586:Phagocytes / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D014779:Virus Replication
chemical_list: D015704:CD4 Antigens; D004274:DNA, Recombinant; D004279:DNA, Viral; D015699:HIV Envelope Protein gp120; D004262:DNA Restriction Enzymes