Abstract
Antiretroviral effects of a new class of interferon (IFN), IFN-tau, were compared with those of IFN-alpha in primary peripheral blood lymphocytes (PBLs) and monocyte-derived macrophages (MDMs), infected in vitro by human immunodeficiency viruses type 1, HIV-1/LAI, and HIV-1/DAS isolates, respectively. Cells were treated with recombinant IFN 24 h before or after HIV infection and then continuously exposed. Viral replication was monitored twice a week by quantifying the reverse transcriptase activity in cell culture supernatants. Integrated proviral DNA was monitored 24 h after infection in IFN-tau-pretreated MDMs, using specific gag gene amplification by the polymerase chain reaction. IFN-tau inhibited HIV-1 replication in both PBLs and MDMs as well as in peripheral blood mononuclear cells (PBMCs). IFN-tau was 35-fold more potent than IFN-alpha in PBLs and 100-fold more potent in MDMs. Differences were observed in the amount of integrated proviral DNA between untreated and 10 IU/ml IFN-tau-treated HIV-infected MDMs. IFN-tau exhibits significant anti-HIV activity in comparison to IFN-alpha, and like other IFNs, it seems to interact with several steps of HIV replication cycle.
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