title: Local and systemic inhibition of lung tumor growth after nanoparticle-mediated mda-7/IL-24 gene delivery.
abstract: The human melanoma differentiation associated gene-7 (mda-7), also known as interleukin-24 (IL-24), is a novel gene with tumor suppressor, antiangiogenic, and cytokine properties. In vitro adenovirus-mediated gene transfer of the human mda-7/IL-24 gene (Ad-mda-7) results in ubiquitous growth suppression of human cancer cells with minimal toxicity to normal cells. Intratumoral administration of Ad-mda-7 to lung tumor xenografts results in growth suppression via induction of apoptosis and antiangiogenic mechanisms. Although these results are encouraging, one limitation of this approach is that its locoregional clinical application-systemic delivery of adenoviruses for treatment of disseminated cancer is not feasible at the present time. An alternative approach that is suitable for systemic application is non-viral gene delivery. We recently demonstrated that DOTAP:cholesterol (DOTAP:Chol) nanoparticles effectively deliver tumor suppressor genes to primary and disseminated lung tumors. In the present study, therefore, we evaluated nanoparticle-mediated delivery of the human mda-7/IL-24 gene to primary and disseminated lung tumors in vivo. We demonstrate that DOTAP:Chol efficiently delivers the mda-7/IL-24 gene to human lung tumor xenografts, resulting in suppression of tumor growth. Growth-inhibitory effects were observed in both primary (P=0.001) and metastatic lung tumors (P=0.02). Furthermore, tumor vascularization was reduced in mda-7/IL-24-treated tumors. Finally, growth was also inhibited in murine syngenic tumors treated with DOTAP:Chol-mda-7 nanoparticles (P=0.01). This is the first report demonstrating (1) systemic therapeutic effects of mda-7/IL-24 in lung cancer, and (2) antitumor effects of human mda-7 in syngeneic cancer models. Our findings are important for the development of mda-7/IL-24 treatments for primary and disseminated cancers.
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030, USA. rramesh@mdanderson.org
authors.forename: Rajagopal
authors.initials: R
authors.lastname: Ramesh
authors.forename: Isao
authors.initials: I
authors.lastname: Ito
authors.forename: Yuji
authors.initials: Y
authors.lastname: Saito
authors.forename: Zheng
authors.initials: Z
authors.lastname: Wu
authors.forename: Abner M
authors.initials: AM
authors.lastname: Mhashikar
authors.forename: Deborah R
authors.initials: DR
authors.lastname: Wilson
authors.forename: Cynthia D
authors.initials: CD
authors.lastname: Branch
authors.forename: Jack A
authors.initials: JA
authors.lastname: Roth
authors.forename: Sunil
authors.initials: S
authors.lastname: Chada
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D005260:Female; D018014:Gene Transfer Techniques; D016147:Genes, Tumor Suppressor; D006801:Humans; D007378:Interleukins / Q000235:genetics*; D008175:Lung Neoplasms / Q000235:genetics / Q000473:pathology*; D051379:Mice; D008807:Mice, Inbred BALB C; D036103:Nanotechnology; D010316:Particle Size; D000099180:Interleukin-24
chemical_list: D007378:Interleukins; D000099180:Interleukin-24