title: Inhibition of HIV-1 replication by an anti-tat hammerhead ribozyme.
abstract: Tat is a virally expressed regulatory protein involved in the replication of HIV-1, the etiological agent of AIDS. To investigate the effect of tat inhibition on HIV replication, we constructed a retroviral vector to express an anti-tat hammerhead ribozyme as part of the 3' untranslated region of beta-galactosidase transcripts. Initial testing of this vector in tat-expressing COS-7 cells reduced tat activity by 85-95% as measured by tat-dependent CAT assays. Amphotropic and HIV-pseudotyped retroviral particles generated with this vector were used in HIV challenge experiments to determine the ability of this reagent to control HIV replication. CD4(+) peripheral blood lymphocytes (PBLs) stably transduced with this vector were subsequently challenged with HIV. These cells were able to resist HIV infection for up to 20 days as measured by cell death and reverse transcriptase activity. These data yield proof of principle that a pseudotyped retroviral vector can target and deliver a protective ribozyme to CD4(+) cells.
authors.affiliation: Department of Biology and Geology, University of South Carolina, Aiken, South Carolina, 29801, USA.
authors.forename: W H
authors.initials: WH
authors.lastname: Jackson
authors.forename: H
authors.initials: H
authors.lastname: Moscoso
authors.forename: J F
authors.initials: JF
authors.lastname: Nechtman
authors.forename: D S
authors.initials: DS
authors.lastname: Galileo
authors.forename: F A
authors.initials: FA
authors.lastname: Garver
authors.forename: K D
authors.initials: KD
authors.lastname: Lanclos
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000378:metabolism; D019556:COS Cells; D015500:Chloramphenicol O-Acetyltransferase / Q000235:genetics / Q000378:metabolism; D015696:Gene Products, tat / Q000037:antagonists & inhibitors*; D005822:Genetic Vectors / Q000235:genetics; D015497:HIV-1 / Q000254:growth & development*; D008979:Moloney murine leukemia virus / Q000235:genetics; D010957:Plasmids / Q000235:genetics; D016337:RNA, Catalytic / Q000378:metabolism*; D012194:RNA-Directed DNA Polymerase / Q000378:metabolism; D014161:Transduction, Genetic / Q000235:genetics; D014162:Transfection / Q000235:genetics; D014764:Viral Proteins / Q000037:antagonists & inhibitors; D001616:beta-Galactosidase / Q000235:genetics; D054322:tat Gene Products, Human Immunodeficiency Virus
chemical_list: D015696:Gene Products, tat; D016337:RNA, Catalytic; D014764:Viral Proteins; D054322:tat Gene Products, Human Immunodeficiency Virus; D015500:Chloramphenicol O-Acetyltransferase; D012194:RNA-Directed DNA Polymerase; D001616:beta-Galactosidase