title: A quinolinone derivative, vesnarinone (OPC-8212), significantly inhibits the in vitro and in vivo growth of human pancreatic cancer cell lines.
abstract: A quinolinone derivative, vesnarinone, has been used as a cardiotonic agent. Previous studies have demonstrated that vesnarinone has potent antitumor activity. The present study was designed to assess the antitumor effects of vesnarinone on human pancreatic cancer cell lines in vitro and in vivo. The in vitro effects of vesnarinone on the human pancreatic cancer cell lines (PANC-1, MIA PaCa-2 and BxPC-3) were assessed by the MTT assay, the Trypan blue dye exclusion test and the Matrigel invasion chamber assay. The inhibition of in vivo tumor growth was evaluated on two human pancreatic cancer xenografts (BxPC-3 and SPa-1) transplanted s.c. into nude mice. The dose of vesnarinone for 50% inhibition of cell growth in a 7 day culture ranged between 10 and 20 micrograms/ml as verified by the Trypan blue dye exclusion test. The dose for 50% cytotoxicity after a 3 day culture in the MTT assay was 32 micrograms/ml for PANC-1 and 30 micrograms/ml for BxPC-3, but 50% cytotoxicity for MIA PaCa-2 was not achieved by the maximal dose of vesnarinone (50 micrograms/ml). Nomalsky optic microscopy and acridine orange staining demonstrated the vacuolization and crater-like changes in the cell nucleus after vesnarinone treatment. Moreover, staining of an apoptosis marker (Le(y) protein) and nick end-labeling increased. Vesnarinone also inhibited cancer invasion in the Matrigel invasion chamber assay. In vivo, BxPC-3 and SPa-1 were s.c. transplanted into the nude mice, and vesnarinone (5 or 50 mg/kg) was daily administered orally for 21 days. In both lines, vesnarinone at 50 mg/kg achieved significant inhibition. The present study suggests that vesnarinone may be a new therapeutic agent for pancreatic cancer.
authors.affiliation: First Department of Surgery, Shimane Medical University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nio
authors.forename: H
authors.initials: H
authors.lastname: Ohmori
authors.forename: Y
authors.initials: Y
authors.lastname: Minari
authors.forename: N
authors.initials: N
authors.lastname: Hirahara
authors.forename: S
authors.initials: S
authors.lastname: Sasaki
authors.forename: M
authors.initials: M
authors.lastname: Takamura
authors.forename: K
authors.initials: K
authors.lastname: Tamura
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy / Q000473:pathology; D000818:Animals; D000970:Antineoplastic Agents / Q000627:therapeutic use / Q000633:toxicity*; D002455:Cell Division / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D003094:Collagen; D004338:Drug Combinations; D005109:Extracellular Matrix; D006801:Humans; D007797:Laminin; D051379:Mice; D008819:Mice, Nude; D009361:Neoplasm Invasiveness; D010190:Pancreatic Neoplasms / Q000188:drug therapy / Q000473:pathology*; D011509:Proteoglycans; D011719:Pyrazines; D011804:Quinolines / Q000627:therapeutic use / Q000633:toxicity*; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D004338:Drug Combinations; D007797:Laminin; D011509:Proteoglycans; D011719:Pyrazines; D011804:Quinolines; C059485:matrigel; C041667:vesnarinone; D003094:Collagen