title: Improvement of transduction efficiency of recombinant adenovirus vector conjugated with cationic liposome for human oral squamous cell carcinoma cell lines.
abstract: Adenovirus (Ad) vectors are commonly used in gene therapy trials because of their efficiency in gene transfer. However, their use is limited by immune responses that reduce transgene expression and decrease the efficiency of repeated vector administration. In this study, the efficacy of gene transduction and the tumor-cell killing effect on four human oral (SAS, HSC-2, HSC-3, HSC-4) and one murine squamous cell carcinoma cell (SCC-7, a kind gift of Dr. M. Hiraoka, Kyoto University) lines in vitro with Ad vector conjugated with catioic liposome (Ad/SUV) was evaluated. Ad/SUV resulted in two to five-fold over higher transduction efficiency in four human and one murine cell lines in vitro than Ad vector alone. The optimal Ad-SUV ratio was determined as 10(6) pfu of Ad vector with 1 micromol SUV. Ad/SUV showed more tumor-cell killing effect than Ad vector alone. Furthermore, the shielding effects of Ad vector with Ad/SUV from neutralizing antibody were evaluated. We also found that Ad/SUV is less susceptible to inactivation by neutralizing antibodies in vitro. The efficacy of gene transduction with Ad vector was blocked more than 70% with neutralizing serum, while Ad/SUV retained approximately 50% of the control activity in vitro. On the basis of these results, the anti-tumor effect with suicide gene therapy using Ad/SUV in vivo was evaluated. Three injections of Ad/SUV showed the inhibition of tumor growth compared with control in vivo. Our results suggested that an enhanced anti-tumor effect on human oral squamous cell carcinoma would be obtained with repeated administrations of Ad/SUV.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Nagoya University Graduate School of Medicine, 65 Tsuruma-cho, Showa-ku, Nagoya 466-8550, Japan.
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Fukuhara
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Yamamoto
authors.forename: Takafumi
authors.initials: T
authors.lastname: Fukui
authors.forename: Masaya
authors.initials: M
authors.lastname: Nishikawa
authors.forename: Kenji
authors.initials: K
authors.lastname: Mitsudo
authors.forename: Iwai
authors.initials: I
authors.lastname: Tohnai
authors.forename: Minoru
authors.initials: M
authors.lastname: Ueda
authors.forename: Masaaki
authors.initials: M
authors.lastname: Mizuno
authors.forename: Jun
authors.initials: J
authors.lastname: Yoshida
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D000818:Animals; D000914:Antibodies, Viral / Q000276:immunology; D000998:Antiviral Agents / Q000627:therapeutic use; D002294:Carcinoma, Squamous Cell / Q000276:immunology / Q000628:therapy*; D002412:Cations; D015774:Ganciclovir / Q000627:therapeutic use; D015870:Gene Expression; D005818:Genetic Engineering; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors / Q000235:genetics / Q000494:pharmacology*; D006801:Humans; D008081:Liposomes; D051379:Mice; D008809:Mice, Inbred C3H; D009062:Mouth Neoplasms / Q000276:immunology / Q000628:therapy*; D009368:Neoplasm Transplantation; D018139:Simplexvirus / Q000201:enzymology; D013937:Thymidine Kinase / Q000235:genetics; D014161:Transduction, Genetic / Q000379:methods*; D014407:Tumor Cells, Cultured; D001616:beta-Galactosidase / Q000235:genetics
chemical_list: D000914:Antibodies, Viral; D000998:Antiviral Agents; D002412:Cations; D008081:Liposomes; D013937:Thymidine Kinase; D001616:beta-Galactosidase; D015774:Ganciclovir