title: Therapeutic and specific antitumor immunity induced by co-administration of immature dendritic cells and adenoviral vector expressing biologically active IL-18.
abstract: Interleukin-18 is a potent cytokine expressed early in the immune response following cleavage in activated composes. We have investigated the in vivo antitumor effects of intratumoral (i.t.) administration of an adenoviral vector expressing biologically active murine interleukin (IL)-18 (Ad.PTH.IL-18). Substantial antitumor effects were observed when established MCA205 fibrosarcoma was treated in syngeneic immunocompetent mice with intratumoral injection of Ad.PTH.IL-18 (P = 0.0025 versus control vector treatment), generating potent cytotoxic T lymphocytes (CTLs) in culture. In contrast, the antitumor effect was absent, and cytotoxic activity was significantly less (P = 0.021) in gld mice (Fas ligand deficient). To enhance the in vivo antitumor activity of the treatment using Ad.PTH.IL-18, we co-injected immature DC and Ad.PTH.IL-18 i.t. into established, day 7 MCA205 fibrosarcoma and MC38 adenocarcinoma. Co-injection of both Ad.PTH.IL-18 and DC was associated with complete abrogation of injected tumors. Furthermore, the antitumor effects were also observed on distant tumors inoculated i.d. in the contralateral flank of the animal. The induced cytolytic activity was tumor-specific and MHC class I-restricted. As we have previously demonstrated in vitro (Tanaka F et al, Cancer Res 2000; 60: 4838-4844) and consistent with these findings in vivo, NK, T and dendritic cells coactivately mediate the IL-18 enhanced antitumor effect. This study suggests that the coactivate strategy could be used in the clinical setting to treat patients with cancer. do
authors.affiliation: Department of Surgery, University of Pittsburgh School of Medicine, PA, USA.
authors.forename: F
authors.initials: F
authors.lastname: Tanaka
authors.forename: W
authors.initials: W
authors.lastname: Hashimoto
authors.forename: P D
authors.initials: PD
authors.lastname: Robbins
authors.forename: M T
authors.initials: MT
authors.lastname: Lotze
authors.forename: H
authors.initials: H
authors.lastname: Tahara
mesh_terms: D018195:Adenosarcoma / Q000628:therapy; D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D003713:Dendritic Cells / Q000276:immunology*; D053222:Fas Ligand Protein; D005354:Fibrosarcoma / Q000276:immunology / Q000628:therapy*; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors / Q000008:administration & dosage* / Q000235:genetics; D016219:Immunotherapy, Adoptive / Q000379:methods*; D015552:Injections, Intralesional; D018664:Interleukin-12 / Q000235:genetics; D020382:Interleukin-18 / Q000235:genetics*; D008562:Membrane Glycoproteins / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D009368:Neoplasm Transplantation; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D014407:Tumor Cells, Cultured
chemical_list: D053222:Fas Ligand Protein; C505658:Fasl protein, mouse; D020382:Interleukin-18; D008562:Membrane Glycoproteins; D018664:Interleukin-12