title: Possible inhibition of cancer cell adhesion to the extracellular matrix in NK4-induced suppression of peritoneal implantation.
abstract: Milky spots (MS), peritoneal lymphoid tissues, expose the extracellular matrix (ECM) due to a defect of mesothelial cells on their surface, which may explain why peritoneal implantation of cancer cells preferentially takes place at MS. We recently reported that adenovirus vector-mediated intraperitoneal production of NK4 strongly suppressed MS-selective implantation of cancer cells and subsequent peritoneal dissemination, without histological evidence of angiogenesis inhibition. The present study was conducted to clarify the mechanisms underlying the suppressive effects of NK4 on peritoneal implantation. In mice intraperitoneally injected with CT26 cells that were genetically modified to produce NK4 (CT26-NK4), peritoneal dissemination was significantly suppressed with survival prolongation. A decreased cell implantation to omental MS was also detected and evaluated by green fluorescence protein (GFP) imaging. In an in vitro adhesion assay, hepatocyte growth factor-stimulated adhesion to ECM components, such as fibronectin and collagen, was inhibited in CT26-NK4 compared to control cells. These results strongly suggest an inhibition of cancer cell adhesion to the ECM in the suppression of peritoneal implantation by NK4.
authors.affiliation: Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-hirokoji, Kamigyo-ku, Kyoto, 602-0841, Japan.
authors.forename: Mamoru
authors.initials: M
authors.lastname: Yoshimura
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Fujiwara
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kubota
authors.forename: Hisashi
authors.initials: H
authors.lastname: Amaike
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Takashima
authors.forename: Satoshi
authors.initials: S
authors.lastname: Inada
authors.forename: Kiyoto
authors.initials: K
authors.lastname: Atsuji
authors.forename: Yasunobu
authors.initials: Y
authors.lastname: Araki
authors.forename: Kunio
authors.initials: K
authors.lastname: Matsumoto
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Nakamura
authors.forename: Hisakazu
authors.initials: H
authors.lastname: Yamagishi
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics / Q000378:metabolism / Q000517:prevention & control* / Q000556:secondary; D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D016466:CHO Cells; D002448:Cell Adhesion / Q000502:physiology; D003110:Colonic Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D006224:Cricetinae; D005109:Extracellular Matrix / Q000473:pathology*; D005260:Female; D005822:Genetic Vectors / Q000235:genetics; D017228:Hepatocyte Growth Factor / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D009368:Neoplasm Transplantation; D010534:Peritoneal Neoplasms / Q000473:pathology / Q000517:prevention & control* / Q000556:secondary; D014162:Transfection
chemical_list: C066855:HGF protein, human; D017228:Hepatocyte Growth Factor