title: Modulation of interferon-mediated inhibition of human immunodeficiency virus type 1 by Tat.
abstract: Recently, we have shown that in acutely infected T cells interferons (IFNs) effectively inhibit the human immunodeficiency type 1 (HIV-1) proviral DNA synthesis during a single replication cycle. In the present study, we have evaluated the relative effectiveness of IFNs in restricting HIV-1 expression at post-transcriptional level. Treatment of HeLa cells with IFNs A* and B (up to 1,000 U/ml) did not result in a reduction in HIV-1 RNA and protein synthesis encoded by the transfected HIV-1 proviral clone. Interestingly, IFN treatment reduced significantly the HIV-1 mRNA levels encoded by the transfected tat-defective HIV-1 provirus, and this inhibition could be overcome by transfection with Tat- and Rev-expressing plasmids. These results suggest that HIV-1-encoded Tat and Rev can overcome the inhibitory effects of IFNs on HIV-1 replication.
authors.affiliation: Oncology Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231.
authors.forename: Y
authors.initials: Y
authors.lastname: Shirazi
authors.forename: W
authors.initials: W
authors.lastname: Popik
authors.forename: P M
authors.initials: PM
authors.lastname: Pitha
mesh_terms: D015696:Gene Products, tat / Q000096:biosynthesis*; D015497:HIV-1 / Q000187:drug effects* / Q000235:genetics; D006367:HeLa Cells; D006801:Humans; D007372:Interferons / Q000494:pharmacology*; D012323:RNA Processing, Post-Transcriptional; D014779:Virus Replication / Q000187:drug effects*; D054322:tat Gene Products, Human Immunodeficiency Virus
chemical_list: D015696:Gene Products, tat; D054322:tat Gene Products, Human Immunodeficiency Virus; D007372:Interferons