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Baculovirus Infection of Human Monocyte-Derived Dendritic Cells Restricts HIV-1 Replication.

Acquired immune deficiency syndrome (AIDS) is mainly caused by infection with human immunodeficiency virus-1 (HIV-1) and still poses a global threat for which we lack a protective or therapeutic vaccine. Dendritic cells (DCs) play a major role in the onset of HIV infection, providing one of the primary sites of HIV replication, and also act as viral reservoirs in vivo. Previous studies have shown that baculovirus (BV) induces strong host immune responses against infections and malignancies. In this study, we infected human monocyte-derived DCs with recombinant BV (AcCAG-gag) and showed that AcCAG-gag-infected human DCs underwent maturation and produced interferon alpha and other proinflammatory cytokines accompanied by increases in the mRNA and protein expression levels of APOBEC3 (A3A, A3F, and A3G), proteins associated with the inhibition of HIV-1 replication. Surprisingly, HIV-1 inhibition is also observed in human DCs infected with a wild-type BV, as determined by the production of inflammatory cytokines, the expression of A3, and a reduction in the p24 level. Our findings outline the mechanism underlying the inhibition of HIV-1 in BV-infected human DCs and pave the way for the use of BV as an effective tool for immunotherapy against HIV-1.