title: Productive infection of human immunodeficiency virus type 1 in dendritic cells requires fusion-mediated viral entry.
abstract: Human immunodeficiency virus type 1 (HIV-1) enters dendritic cells (DCs) through endocytosis and viral receptor-mediated fusion. Although endocytosis-mediated HIV-1 entry can generate productive infection in certain cell types, including human monocyte-derived macrophages, productive HIV-1 infection in DCs appears to be dependent on fusion-mediated viral entry. It remains to be defined whether endocytosed HIV-1 in DCs can initiate productive infection. Using HIV-1 infection and cellular fractionation assays to measure productive viral infection and entry, here we show that HIV-1 enters monocyte-derived DCs predominately through endocytosis; however, endocytosed HIV-1 cannot initiate productive HIV-1 infection in DCs. In contrast, productive HIV-1 infection in DCs requires fusion-mediated viral entry. Together, these results provide functional evidence in understanding HIV-1 cis-infection of DCs, suggesting that different pathways of HIV-1 entry into DCs determine the outcome of viral infection.
authors.affiliation: Department of Microbiology and Molecular Genetics, Medical College of Wisconsin, Milwaukee, WI 53226, USA.
authors.forename: Alicia M
authors.initials: AM
authors.lastname: Janas
authors.forename: Chunsheng
authors.initials: C
authors.lastname: Dong
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Wang
authors.forename: Li
authors.initials: L
authors.lastname: Wu
mesh_terms: D002458:Cell Fractionation; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000821:virology; D004705:Endocytosis / Q000502:physiology; D015658:HIV Infections / Q000821:virology*; D015497:HIV-1 / Q000502:physiology*; D006801:Humans; D008561:Membrane Fusion / Q000502:physiology*; D053586:Virus Internalization