title: JTE-522, a selective COX-2 inhibitor, interferes with the growth of lung metastases from colorectal cancer in rats due to inhibition of neovascularization: a vascular cast model study.
abstract: The lung is a frequent site of metastasis from colorectal cancer, but angiogenesis of lung metastases has not been clarified. Some COX-2 inhibitors prevent tumor growth, although the inhibitory mechanism at the metastatic site is obscure. We investigated the microvascular structure of small lung metastases and the effect of JTE-522, a selective COX-2 inhibitor, on the angiogenesis of pulmonary metastases from colorectal cancer in rats. The tail veins of 25 male F344/DuCrj rats, aged 5 weeks, were injected with a tumor suspension containing 5 x 10(6) RCN-9, a rat colon cancer cell line. Three weeks later, pulmonary vascular resin corrosion casts were taken and the vascularity of metastases was studied using stereo and scanning electron microscopes. We investigated the effect of 0, 10 and 30 mg/kg/day of JTE-522 on the angiogenesis of pulmonary metastases in 3 groups of 5 male rats out of 25. JTE-522 reduced the diameter of tumor vessels as well as the number and size of metastatic tumors. The diameter of tumor vessels and the size of lung metastases significantly and positively correlated with neovascularization in the control group, but not in the JTE-522-treated groups. JTE-522 also affected type of vasculature of metastases, which differed depending on their size. JTE-522 interfered with the growth of hematogenous metastatic tumors by disrupting neovascularization. However, JTE-522 may have some important mechanisms other than inhibition of neovascularization. JTE-522 may be one of the therapeutic agents for the treatment of hematogenous metastasis of colorectal cancer.
authors.affiliation: Department of Surgical Oncology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan. koba@me.ndmc.ac.jp
authors.forename: Hirotoshi
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Gonda
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Uetake
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Higuchi
authors.forename: Masayuki
authors.initials: M
authors.lastname: Enomoto
authors.forename: Kenichi
authors.initials: K
authors.lastname: Sugihara
mesh_terms: D020533:Angiogenesis Inhibitors / Q000494:pharmacology*; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D001557:Benzenesulfonates / Q000494:pharmacology*; D045744:Cell Line, Tumor; D015179:Colorectal Neoplasms / Q000473:pathology*; D051546:Cyclooxygenase 2; D004791:Enzyme Inhibitors / Q000494:pharmacology; D007527:Isoenzymes / Q000037:antagonists & inhibitors*; D016015:Logistic Models; D008175:Lung Neoplasms / Q000098:blood supply / Q000188:drug therapy* / Q000556:secondary; D008297:Male; D008833:Microcirculation / Q000187:drug effects; D008855:Microscopy, Electron, Scanning / Q000379:methods; D009389:Neovascularization, Pathologic / Q000188:drug therapy*; D010080:Oxazoles / Q000494:pharmacology*; D011451:Prostaglandin-Endoperoxide Synthases; D011652:Pulmonary Circulation / Q000187:drug effects; D051381:Rats; D011916:Rats, Inbred F344; D000096926:Benzenesulfonamides
chemical_list: D020533:Angiogenesis Inhibitors; D000970:Antineoplastic Agents; D001557:Benzenesulfonates; D051546:Cyclooxygenase 2; D004791:Enzyme Inhibitors; D007527:Isoenzymes; D010080:Oxazoles; D011451:Prostaglandin-Endoperoxide Synthases; C110453:4-(4-cyclohexyl-2-methyloxazol-5-yl)-2-fluorobenzenesulfonamide; D000096926:Benzenesulfonamides