title: Prolonged survival of mice with multiple liver metastases of human colon cancer by intravenous administration of replicable E1B-55K-deleted adenovirus with E1A expressed by CEA promoter.
abstract: Liver is the most preferential site for metastasis of colon cancer. We, in the present study, constructed a self-replicable adenovirus in which E1A is driven by a CEA promoter and E1B-55K is deleted from the E1B region (AdCEAp/Rep) and examined its effects on multiple metastases of a human colon cancer cell in a mouse xenograft model. We first showed effective replication of the virus in various CEA-producing human colon cancer cells (M7609, HT-29) and subsequent lysis of the infected cells in vitro. We then demonstrated that a single intratumoral injection of the virus (1 x 10(8) PFU/100 microl) induced a complete regression of subcutaneous tumors (M7609) inoculated into nude mice. Further, we demonstrated that systemic administration of the virus (1 x 10(8) PFU/100 microl) through the tail vein to nude mice, which 1 week prior had been inoculated with tumor cells (colon carcinoma cell line HT-29) via the spleen and showed apparent multiple metastases in the liver, effectively suppressed the metastasis formation. The mean survival time of the treated mice was significantly longer than that of the controls. Thus, the systemic administration of AdCEAp/Rep was considered to be effective on multiple liver metastases of CEA-positive colon cancer in a xenograft model.
authors.affiliation: Fourth Department of Internal Medicine, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan.
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Sagawa
authors.forename: Minoru
authors.initials: M
authors.lastname: Takahashi
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Sato
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Sato
authors.forename: Yue
authors.initials: Y
authors.lastname: Lu
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Sumiyoshi
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Yamada
authors.forename: Satoshi
authors.initials: S
authors.lastname: Iyama
authors.forename: Junki
authors.initials: J
authors.lastname: Fukaura
authors.forename: Katsunori
authors.initials: K
authors.lastname: Sasaki
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Hamada
authors.forename: Koji
authors.initials: K
authors.lastname: Miyanishi
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Takayama
authors.forename: Junji
authors.initials: J
authors.lastname: Kato
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Niitsu
mesh_terms: D000256:Adenoviridae / Q000235:genetics / Q000502:physiology; D017500:Adenovirus E1A Proteins / Q000235:genetics* / Q000378:metabolism; D017501:Adenovirus E1B Proteins / Q000172:deficiency / Q000235:genetics*; D000818:Animals; D002272:Carcinoembryonic Antigen / Q000032:analysis / Q000096:biosynthesis / Q000235:genetics*; D003110:Colonic Neoplasms / Q000235:genetics* / Q000473:pathology* / Q000628:therapy; D004195:Disease Models, Animal; D005260:Female; D017353:Gene Deletion; D015316:Genetic Therapy; D022781:Hepatocytes / Q000378:metabolism; D006801:Humans; D007262:Infusions, Intravenous; D008113:Liver Neoplasms / Q000235:genetics / Q000473:pathology / Q000556:secondary* / Q000628:therapy; D051379:Mice; D009368:Neoplasm Transplantation; D011401:Promoter Regions, Genetic / Q000235:genetics; D012878:Skin Neoplasms / Q000235:genetics / Q000473:pathology / Q000556:secondary / Q000628:therapy; D015996:Survival Rate; D013997:Time Factors; D014407:Tumor Cells, Cultured; D014779:Virus Replication
chemical_list: D017500:Adenovirus E1A Proteins; D017501:Adenovirus E1B Proteins; D002272:Carcinoembryonic Antigen