title: Induction of therapeutic antitumor immunity by in vivo administration of a lentiviral vaccine.
abstract: Direct in vivo administration of a lentiviral vaccine has been shown to transduce dendritic cells (DCs) in order to induce antigen-specific CD8+ T cell responses, but the efficacy of antitumor immunity has not been reported. In this study we tested whether direct in vivo administration of a lentiviral vaccine can induce selfantigen- based therapeutic antitumor immunity in murine tumor models. Lentiviral vector (LV) transduced DCs efficiently in vitro and was able to transduce DCs in vivo. LV-transduced DCs effectively presented antigens to T cells. Compared with a naked DNA tyrosinase-related protein-2 (TRP2)-heat shock protein-70 (hsp70) vaccine, the TRP2-specific interferon-gamma-producing CD8+ T cell response was augmented by direct in vivo administration of an LV-TRP2hsp70 vaccine, which induced significant therapeutic antitumor immunity in subcutaneous B16 and subcutaneous GL-26 models. Moreover, in vivo administration of an LV-NeuEDhsp70 vaccine induced significant therapeutic antitumor immunity against spontaneous breast tumors in a BALB/c- Neu transgenic model. Our observations indicate that direct in vivo administration of a lentiviral vaccine not only enhances antigen-specific CD8+ T cell responses, but also generates significant therapeutic antitumor activities.
authors.affiliation: Department of Dermatology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA.
authors.forename: Jin H
authors.initials: JH
authors.lastname: Kim
authors.forename: Nilanjana
authors.initials: N
authors.lastname: Majumder
authors.forename: Honghui
authors.initials: H
authors.lastname: Lin
authors.forename: Simon
authors.initials: S
authors.lastname: Watkins
authors.forename: Louis D
authors.initials: LD
authors.lastname: Falo
authors.forename: Zhaoyang
authors.initials: Z
authors.lastname: You
mesh_terms: D000818:Animals; D001483:Base Sequence; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D045744:Cell Line, Tumor; D017931:DNA Primers; D003713:Dendritic Cells / Q000276:immunology; D016086:Lentivirus / Q000235:genetics*; D008546:Melanoma, Experimental / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D014765:Viral Vaccines / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D017931:DNA Primers; D014765:Viral Vaccines