title: Inhibition of human immunodeficiency virus type 1 replication in myelomonocytic cells derived from retroviral vector-transduced peripheral blood progenitor cells.
abstract: Monocytes and macrophages (Mo/Mphi) contribute to the pathogenesis of human immunodeficiency virus type 1 (HIV-1) infection. A successful hematopoietic stem/progenitor cell (HSPC)-based gene therapy strategy for HIV-1 disease must protect Mo/Mphi as well as T cells from HIV-1-related pathology. In this report, we demonstrate that RevM10-transduced HSPCs isolated from cytokine-mobilized peripheral blood give rise to Mo/Mphi suppressing replication of Mphi-tropic HIV-1 isolates. A Moloney murine leukemia virus (MoMLV)-based retroviral vector encoding a bicistronic mRNA co-expressing RevM10 and the murine CD8alpha' chain (Lyt2) was used to transduce HSPCs. Following transduction, these cells were expanded and differentiated by short-term culture in methylcellulose containing various cytokines. In vitro differentiated Mo/Mphi were enriched by fluorescence activated cell sorting (FACS) for the co-expressed transgene (Lyt2) and myelomonocytic (CD33, CD14) surface markers. HIV-1 replication of two Mphi-tropic isolates (JR-FL, BaL) was inhibited in Mo/Mphi expressing RevM10 and Lyt2 relative to control cells expressing only Lyt2 but no functional RevM10 gene product. Cell proliferation and expression of lineage-specific surface markers was not altered in transduced, in vitro differentiated Mo/Mphi cells. This study supports the feasibility of HSPC-based gene therapy as a future treatment for HIV-1 disease.
authors.affiliation: Systemix, Inc., Palo Alto, CA 94304, USA.
authors.forename: U
authors.initials: U
authors.lastname: Junker
authors.forename: C S
authors.initials: CS
authors.lastname: Kalfoglou
authors.forename: J J
authors.initials: JJ
authors.lastname: Moon
authors.forename: M K
authors.initials: MK
authors.lastname: Beck
authors.forename: H
authors.initials: H
authors.lastname: Kaneshima
authors.forename: E
authors.initials: E
authors.lastname: Böhnlein
mesh_terms: D002472:Cell Transformation, Viral; D005822:Genetic Vectors; D015497:HIV-1 / Q000502:physiology*; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000821:virology*; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000166:cytology; D008264:Macrophages / Q000166:cytology / Q000821:virology; D008979:Moloney murine leukemia virus; D009000:Monocytes / Q000166:cytology / Q000821:virology*; D014779:Virus Replication