title: Inhibition of human immunodeficiency virus replication and growth advantage of CD4+ T cells and monocytes derived from CD34+ cells transduced with an intracellular antibody directed against human immunodeficiency virus type 1 Tat.
abstract: Current clinical gene therapy protocols for the treatment of human immunodeficiency virus type 1 (HIV-1) infection involve the ex vivo transduction and expansion of CD4+ T cells derived from HIV-positive patients at a late stage in their disease (CD4+ cell count <400 cells/mm3). We examined the efficiency of transduction and transgene expression in adult bone marrow (BM)- and umbilical cord blood (UCB)-derived CD34+ cells induced to differentiate into T cells and monocytes in vitro with an MuLV-based vector encoding the neomycin resistance gene and an intracellular antibody directed against the Tat protein of HIV-1 (sFvtat1-Ckappa). The expression of the marker gene and the effects of antiviral construct on subsequent challenge with monocytotropic and T cell-tropic HIV-1 isolates were monitored in vitro in purified T cells and monocytes generated in culture from the transduced CD34+ cells. Transduction efficiencies of CD34+ cells ranged between 22 and 27%. Differentiation of CD34+ cells into T cells or monocytes was not significantly altered by the transduction process. HIV-1 replication in monocytes and CD4+ T cells derived from CD34+ cells transduced with the intracellular antibody gene was significantly reduced in comparison with the degree of HIV replication seen in monocytes and CD4+ T cells derived from CD34+ cells transduced with the neomycin resistance gene alone. Further, T cells and monocytes derived from CD34+ cells transduced with the intracellular antibody gene were demonstrated to express the sFvtat1-Ckappa transgene by RT-PCR and had a selective growth advantage in cultures that had been challenged with HIV-1. These data demonstrate that sFvtat1-Ckappa inhibits HIV-1 replication in T cells and monocytes developing from CD34+ cells and supports the continuing development of a stem cell gene therapy for the treatment of HIV-1 infection.
authors.affiliation: Partners AIDS Research Center, Massachusetts General Hospital, Harvard Medical School, Boston 02129, USA.
authors.forename: M C
authors.initials: MC
authors.lastname: Poznansky
authors.forename: J
authors.initials: J
authors.lastname: La Vecchio
authors.forename: S
authors.initials: S
authors.lastname: Silva-Arietta
authors.forename: J
authors.initials: J
authors.lastname: Porter-Brooks
authors.forename: K
authors.initials: K
authors.lastname: Brody
authors.forename: I T
authors.initials: IT
authors.lastname: Olszak
authors.forename: G B
authors.initials: GB
authors.lastname: Adams
authors.forename: U
authors.initials: U
authors.lastname: Ramstedt
authors.forename: W A
authors.initials: WA
authors.lastname: Marasco
authors.forename: D T
authors.initials: DT
authors.lastname: Scadden
mesh_terms: D000328:Adult; D018952:Antigens, CD34 / Q000032:analysis*; D001483:Base Sequence; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology* / Q000276:immunology; D002455:Cell Division / Q000276:immunology; D019070:Cell Lineage; D017931:DNA Primers; D015696:Gene Products, tat / Q000276:immunology*; D015497:HIV-1 / Q000502:physiology*; D006801:Humans; D016130:Immunophenotyping; D009000:Monocytes / Q000166:cytology* / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014161:Transduction, Genetic; D019076:Transgenes; D014779:Virus Replication / Q000276:immunology*; D054322:tat Gene Products, Human Immunodeficiency Virus
chemical_list: D018952:Antigens, CD34; D017931:DNA Primers; D015696:Gene Products, tat; D054322:tat Gene Products, Human Immunodeficiency Virus