title: Viral vector-mediated transduction of a modified thrombospondin-2 cDNA inhibits tumor growth and angiogenesis.
abstract: Gene therapy represents a possible alternative to the chronic delivery of recombinant antiangiogenic proteins to cancer patients. We have constructed retroviral and adenoviral vectors that express murine N-terminal fragments of thrombospondin-2 (NfTSP2), a potent endogenous inhibitor of tumor growth and angiogenesis. To test the possibility of anticancer gene therapy using NfTSP2, we tested whether an ex vivo retrovirus-mediated procedure could be used for the treatment of tumors. The treatment of tumor-bearing mice with syngenic immortalized cell lines expressing NfTSP2 led to a tumor volume reduction up to 70% as compared with the controls (P<0.005). In addition, the established tumors were eradicated in 40% of the mice treated with NfTSP2-expressing cells. Furthermore, the intratumoral injection of the NfTSP2-expressing adenoviral vector to the human squamous cell carcinoma in nude mice resulted in a significant reduction of the growth rates and the volumes of the carcinoma (P<0.05). Immunohistochemical staining of the tumors indicated that the total area and the average size of tumor vessels were significantly reduced in the treatment group versus the controls (P<0.05). In conclusion, the present study clearly demonstrates that the viral vector-mediated transfer of the NfTSP2 gene could inhibit the growth of tumors by perturbing tumor-associated angiogenesis.
authors.affiliation: ViroMed Co., Ltd, BongCheon-dong, KwanAk-gu, Seoul, Korea.
authors.forename: W
authors.initials: W
authors.lastname: Hahn
authors.forename: S-H
authors.initials: SH
authors.lastname: Ho
authors.forename: J-G
authors.initials: JG
authors.lastname: Jeong
authors.forename: E-Y
authors.initials: EY
authors.lastname: Hahn
authors.forename: S
authors.initials: S
authors.lastname: Kim
authors.forename: S S
authors.initials: SS
authors.lastname: Yu
authors.forename: S
authors.initials: S
authors.lastname: Kim
authors.forename: J-M
authors.initials: JM
authors.lastname: Kim
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D002294:Carcinoma, Squamous Cell / Q000378:metabolism / Q000473:pathology; D018076:DNA, Complementary / Q000235:genetics; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000098:blood supply / Q000473:pathology / Q000628:therapy*; D009389:Neovascularization, Pathologic / Q000628:therapy*; D012190:Retroviridae / Q000235:genetics; D019699:Thrombospondins / Q000235:genetics* / Q000378:metabolism; D014161:Transduction, Genetic / Q000379:methods; D014407:Tumor Cells, Cultured; D000099262:Thrombospondin 2
chemical_list: D018076:DNA, Complementary; D019699:Thrombospondins; D000099262:Thrombospondin 2