Abstract:
:It is generally assumed that inflammation influences carcinogenesis. We previously reported that dextran sodium sulfate (DSS) strongly enhances colon carcinogenesis in the Apc(Min/+) mice and the over-expression of inducible nitric oxide synthase (iNOS) contributes to this enhancement. In the current study, we investigated the effect of a selective iNOS inhibitor, ONO-1714 on colitis-related colon carcinogenesis in the Apc(Min/+) mouse treated with DSS. Male C57BL/6J Apc(Min/+) and Apc(+/+) mice were exposed to 1% DSS in their drinking water for 7 days. ONO-1714 was given to the mice at a dose level of 50 or 100 ppm in diet for 5 weeks (during the administration of DSS). The tumor inhibitory effects by ONO-1714 were assessed at week 5 by counting the incidence and multiplicity of colonic neoplasms. Additionally, we assessed serum lipid levels and colonic mRNA expression for cyclooxygenase (COX)-2, iNOS, tumor necrosis factor (TNF)-alpha and interleukin (IL)-1beta. Feeding with ONO-1714 significantly inhibited the occurrence of colonic adenocarcinoma in a dose-dependent manner in the Apc(Min/+) mice. In addition, the treatment with ONO-1714 significantly lowered the serum triglyceride levels and mRNA expression levels of COX-2, TNFalpha and IL-1beta of colonic mucosa in the DSS-treated Apc(Min/+) mice. Neither ONO-1714 nor DSS affected the colonic pathology in the Apc(+/+) mice. Our findings may suggest that ONO-1714 could therefore serve as an effective agent for suppression of colitis-related colon cancer development in the Apc(Min/+) mice.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Kohno H,Takahashi M,Yasui Y,Suzuki R,Miyamoto S,Kamanaka Y,Naka M,Maruyama T,Wakabayashi K,Tanaka Tdoi
10.1002/ijc.22736subject
Has Abstractpub_date
2007-08-01 00:00:00pages
506-13issue
3eissn
0020-7136issn
1097-0215journal_volume
121pub_type
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