title: Plasminogen activator inhibitor-1 (PAI-1) gene transfection inhibits the liver metastasis of pancreatic cancer by preventing angiogenesis.
abstract: Plasminogen activator inhibitor-1 (PAI-1) is a unique type of serine protease inhibitor and one of the key regulators of tumor invasion and metastasis. The purpose of this study was to elucidate the effect of PAI-1 gene transfection on liver metastasis and its mechanism by using the human high liver metastasis pancreatic cancer cell line, SW1990. PAI-1-transfected SW1990 (SW/PAI-1) produced a significantly higher level of PAI-1 in supernatant than parental cells. While no difference was observed for the production of u-PA and u-PA activity in the supernatant, cell proliferation of SW/PAI-1 was slightly suppressed on the 7th day of incubation compared to parental cells. Cellular invasion, in vivo tumorigenesis in xenograft and liver metastasis were significantly suppressed in SW/PAI-1 cells compared to parental cells. The angiogenesis of xenograft by detecting microvascular density and the production of metastasis-related factors, such as VEGF and TGF-beta1, were also decreased in SW/PAI-1 cells. These findings suggested that PAI-1 gene transfection might have the ability to prevent the liver metastasis of pancreatic cancer by modulating angiogenesis.
authors.affiliation: Department of Surgical Oncology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan.
authors.forename: Masafumi
authors.initials: M
authors.lastname: Inoue
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Sawada
authors.forename: Yasutake
authors.initials: Y
authors.lastname: Uchima
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Kimura
authors.forename: Tamahiro
authors.initials: T
authors.lastname: Nishihara
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Tanaka
authors.forename: Masakazu
authors.initials: M
authors.lastname: Yashiro
authors.forename: Nobuya
authors.initials: N
authors.lastname: Yamada
authors.forename: Masaichi
authors.initials: M
authors.lastname: Ohira
authors.forename: Kosei
authors.initials: K
authors.lastname: Hirakawa
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D002465:Cell Movement; D049109:Cell Proliferation; D017077:Culture Media, Conditioned / Q000737:chemistry; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007150:Immunohistochemistry; D008113:Liver Neoplasms / Q000517:prevention & control / Q000556:secondary*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009389:Neovascularization, Pathologic / Q000378:metabolism / Q000473:pathology* / Q000517:prevention & control; D010190:Pancreatic Neoplasms / Q000098:blood supply / Q000235:genetics / Q000473:pathology*; D017395:Plasminogen Activator Inhibitor 1 / Q000032:analysis / Q000235:genetics / Q000502:physiology*; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000032:analysis; D014162:Transfection; D016212:Transforming Growth Factor beta / Q000032:analysis; D053773:Transforming Growth Factor beta1; D014568:Urokinase-Type Plasminogen Activator / Q000032:analysis; D042461:Vascular Endothelial Growth Factor A / Q000032:analysis; D023041:Xenograft Model Antitumor Assays / Q000379:methods
chemical_list: D017077:Culture Media, Conditioned; D017395:Plasminogen Activator Inhibitor 1; D019408:Platelet Endothelial Cell Adhesion Molecule-1; C508960:TGFB1 protein, human; C508961:Tgfb1 protein, mouse; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1; D042461:Vascular Endothelial Growth Factor A; D014568:Urokinase-Type Plasminogen Activator