title: Infectious simian/human immunodeficiency virus with human immunodeficiency virus type 1 subtype C from an African isolate: rhesus macaque model.
abstract: Human immunodeficiency virus type 1 (HIV-1) subtype C is responsible for more than 56% of all infections in the HIV and AIDS pandemic. It is the predominant subtype in the rapidly expanding epidemic in southern Africa. To develop a relevant model that would facilitate studies of transmission, pathogenesis, and vaccine development for this subtype, we generated SHIV(MJ4), a simian/human immunodeficiency virus (SHIV) chimera based on HIV-1 subtype C. SHIV(MJ4) contains the majority of env, the entire second exon of tat, and a partial sequence of the second exon of rev, all derived from a CCR5-tropic, primary isolate envelope clone from southern Africa. SHIV(MJ4) replicated efficiently in human, rhesus, and pig-tailed macaque peripheral blood mononuclear cells (PBMCs) in vitro but not in CEMx174 cells. To assess in vivo infectivity, SHIV(MJ4) was intravenously inoculated into four rhesus macaques (Macaca mulatta). All four animals became infected as determined through virus isolation, PCR analysis, and viral loads of 10(7) to 10(8) copies of viral RNA per ml of plasma during the primary infection phase. We have established a CCR5-tropic SHIV(MJ4)/rhesus macaque model that may be useful in the studies of HIV-1 subtype C immunology and biology and may also facilitate the evaluation of vaccines to control the spread of HIV-1 subtype C in southern Africa and elsewhere.
authors.affiliation: Harvard AIDS Institute and Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, Massachusetts 02115, USA.
authors.forename: T
authors.initials: T
authors.lastname: Ndung'u
authors.forename: Y
authors.initials: Y
authors.lastname: Lu
authors.forename: B
authors.initials: B
authors.lastname: Renjifo
authors.forename: N
authors.initials: N
authors.lastname: Touzjian
authors.forename: N
authors.initials: N
authors.lastname: Kushner
authors.forename: V
authors.initials: V
authors.lastname: Pena-Cruz
authors.forename: V A
authors.initials: VA
authors.lastname: Novitsky
authors.forename: T H
authors.initials: TH
authors.lastname: Lee
authors.forename: M
authors.initials: M
authors.lastname: Essex
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000917:Antibody Formation; D001483:Base Sequence; D018791:CD4 Lymphocyte Count; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology; D002460:Cell Line; D002678:Chimera; D017931:DNA Primers; D015497:HIV-1 / Q000235:genetics / Q000276:immunology / Q000472:pathogenicity* / Q000502:physiology; D006801:Humans; D008253:Macaca mulatta; D008297:Male; D008954:Models, Biological; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D015302:Simian Immunodeficiency Virus / Q000235:genetics / Q000276:immunology / Q000472:pathogenicity* / Q000502:physiology; D019562:Viral Load; D014779:Virus Replication
chemical_list: D017931:DNA Primers