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Alpha interferon (IFN-alpha) restricts multiple steps of the human immunodeficiency virus type 1 (HIV-1) life cycle. A well-described effect of IFN-alpha is in the modulation of viral nucleic acid synthesis. We demonstrate that IFN-alpha influences HIV-1 DNA synthesis principally by reducing the production of late products of reverse transcription. The magnitude of IFN-alpha-induced downregulation of HIV-1 DNA and/or progeny virion production was dependent on the IFN-alpha concentration, the duration of cytokine administration, the multiplicity of infection, the viral strain, and the cycles of viral infection. Interestingly, reductions in viral DNAs could not fully account for the observed IFN-alpha-induced abrogation of progeny virion production. These data, by our investigation of both single-cycle and spreading viral infections, support a predominant but not exclusive effect of IFN-alpha on viral DNA synthesis.

journal of virology

Alpha interferon-induced antiretroviral activities: restriction of viral nucleic acid synthesis and progeny virion production in human immunodeficiency virus type 1-infected monocytes