Journal Article

Chemopreventative effect of an inducible nitric oxide synthase inhibitor, ONO-1714, on inflammation-associated biliary carcinogenesis in hamsters

Takehiro Mishima, Yoshitsugu Tajima, Tamotsu Kuroki, Taiichiro Kosaka, Tomohiko Adachi, Amane Kitasato, Noritsugu Tsuneoka, Tomoo Kitajima and Takashi Kanematsu

in Carcinogenesis

Volume 30, issue 10, pages 1763-1767
Published in print October 2009 | ISSN: 0143-3334
Published online August 2009 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgp194
Chemopreventative effect of an inducible nitric oxide synthase inhibitor, ONO-1714, on inflammation-associated biliary carcinogenesis in hamsters

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The present study was designed to investigate whether an inducible nitric oxide synthase (iNOS)-specific inhibitor, ONO-1714 [(1S, 5S, 6R, 7R)-7-chloro-3-imino-5-methyl-2-azabicyclo[4.1.0] heptane], could prevent inflammation-associated biliary carcinogenesis in bilioenterostomized hamsters. Syrian golden hamsters underwent choledochojejunostomy and then received subcutaneous injections of the chemical carcinogen N-nitrosobis(2-oxopropyl)amine every 2 weeks at a dose of 10 mg/kg body wt, starting 4 weeks after surgery and continuing for 18 weeks. The hamsters were divided into two groups according to their oral intake of either a standard pelleted diet containing ONO-1714 at 100 p.p.m. for 18 weeks (ONO group, n = 15) or an ordinary diet alone (control group, n = 15). The animals were killed 22 weeks after surgery, and the development of biliary tumors was examined histologically. The presence and degree of cholangitis, cell kinetic status of the biliary epithelium and iNOS expression were evaluated. Intrahepatic biliary adenomas developed in all control animals, whereas they developed in only seven (47%) hamsters treated with ONO-1714 (P < 0.05). Intrahepatic biliary carcinomas were present in 13 (87%) hamsters in the control group and in only 6 (40%) hamsters in the ONO groups (P < 0.05). Histological and immunohistochemical examinations demonstrated a significant decrease in the degree of cholangitis, biliary epithelial cell kinetics and the expression of iNOS in the biliary epithelium in the ONO group in comparison with the control (P < 0.05). These results indicate that ONO-1714 represses N-nitrosobis(2-oxopropyl)amine-induced biliary carcinogenesis in bilioenterostomized hamsters and inhibits iNOS expression in the biliary epithelium. ONO-1714 may therefore be a promising agent for the prevention of biliary carcinoma in various inflammation-associated biliary disorders.

Journal Article.  3086 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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