title: Effect of cyclosporin A on the replication cycle of human immunodeficiency virus type 1 derived from H9 and Molt-4 producer cells.
abstract: The effect of cyclosporin A (CsA) on the replication of human immunodeficiency virus type 1 (HIV-1) was studied. CsA treatment inhibited virus production in chronically infected H9 and Molt-4 cells. CsA treatment of HeLaCD4-LTR/beta-gal cells or extracellular viruses also inhibited infection (IC50 1 microg/ml). The intracellular CsA-binding molecule cyclophilin A was detected in HIV-1 derived from chronically infected H9 cells, but it was present at a substantially lower level in HIV-1 derived from chronically infected Molt-4 cells. The low level of cyclophilin A in viral particles derived from Molt-4 cells correlated well with their substantially lower infectivity as assayed on HeLaCD4-LTR beta-gal cells. CsA treatment of infected cells showed a dose-dependent reduction of cyclophilin A incorporation into virions; the amount of cyclophilin A incorporation was found to be dependent on the producer cell type.
authors.affiliation: Laboratory of Molecular Virology and Carcinogenesis, ABL-Basic Research Program, NCI-Frederick Cancer Research and Development Center, MD 21702-1201, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Briggs
authors.forename: J
authors.initials: J
authors.lastname: Tözsér
authors.forename: S
authors.initials: S
authors.lastname: Oroszlan
mesh_terms: D000591:Amino Acid Isomerases / Q000378:metabolism; D002352:Carrier Proteins / Q000378:metabolism; D016572:Cyclosporine / Q000494:pharmacology*; D016655:HIV Core Protein p24 / Q000378:metabolism; D015497:HIV-1 / Q000187:drug effects / Q000378:metabolism* / Q000502:physiology; D006801:Humans; D019696:Peptidylprolyl Isomerase; D014407:Tumor Cells, Cultured; D014779:Virus Replication / Q000187:drug effects
chemical_list: D002352:Carrier Proteins; D016655:HIV Core Protein p24; D016572:Cyclosporine; D000591:Amino Acid Isomerases; D019696:Peptidylprolyl Isomerase