title: Recombinant adeno-associated virus-mediated TRAIL gene therapy suppresses liver metastatic tumors.
abstract: To evaluate the tumoricidal activity of tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) on disseminated liver metastatic tumors, we constructed a recombinant adeno-associated virus (rAAV) expressing the extracellular domain (95-281aa) of human TRAIL (TRAIL(95-281), and the recombinant virus was designated as rAAV-TRAIL) using the 3-plasmid, helper-virus-free, packaging system. Transduction of mouse lymphoma EL-4 cells and Jurkat T cells lead to the expression of TRAIL(95-281) protein in both virus-transduced cells and the culture media, along with apoptosis of these cells in vitro. The therapeutic potential of rAAV-TRAIL was then evaluated in an orthotopic transplanted mouse model mimicking liver cancer metastasis, which was established by injection of EL-4 cells into the liver of C57BL/6 mice via the hepatic portal veins. Subsequent intraportal vein injection of rAAV-TRAIL, not the control virus, into the liver of these mice resulted in significant suppression of tumor growth and prolonged survival, while normal hepatocyte toxicity is undetectable. Histological and biochemical analysis in tumor tissue and serum confirmed that TRAIL(95-281) was stably expressed in relatively high level in hepatocytes and was secreted into the serum in active trimeric form. Futhermore, the mechanism for rAAV-TRAIL to inhibit tumor growth was by inducing apoptosis of the tumor cells metastasizing to the livers. These results strongly suggest that the rAAV-TRAIL-mediated gene delivery could be a promising approach for the treatment of liver metastasis cancer.
authors.affiliation: National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Ma
authors.forename: Yanxin
authors.initials: Y
authors.lastname: Liu
authors.forename: Shilian
authors.initials: S
authors.lastname: Liu
authors.forename: Hsiang-Fu
authors.initials: HF
authors.lastname: Kung
authors.forename: Xueying
authors.initials: X
authors.lastname: Sun
authors.forename: Dexian
authors.initials: D
authors.lastname: Zheng
authors.forename: Ruian
authors.initials: R
authors.lastname: Xu
mesh_terms: D000256:Adenoviridae; D000818:Animals; D017209:Apoptosis; D051017:Apoptosis Regulatory Proteins; D004195:Disease Models, Animal; D015316:Genetic Therapy; D005822:Genetic Vectors; D008024:Ligands; D008113:Liver Neoplasms / Q000556:secondary* / Q000628:therapy*; D008223:Lymphoma; D008297:Male; D008562:Membrane Glycoproteins; D051379:Mice; D008810:Mice, Inbred C57BL; D053221:TNF-Related Apoptosis-Inducing Ligand; D014161:Transduction, Genetic; D014409:Tumor Necrosis Factor-alpha; D019014:fas Receptor
chemical_list: D051017:Apoptosis Regulatory Proteins; D008024:Ligands; D008562:Membrane Glycoproteins; D053221:TNF-Related Apoptosis-Inducing Ligand; C505653:TNFSF10 protein, human; C505654:Tnfsf10 protein, mouse; D014409:Tumor Necrosis Factor-alpha; D019014:fas Receptor