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A -Tocopherol–Rich Mixture of Tocopherols Inhibits Colon Inflammation and Carcinogenesis in Azoxymethane and Dextran Sulfate Sodium–Treated Mice

Authors' Affiliations: ¹ Susan Lehman Cullman Laboratory for Cancer Research, Department of Chemical Biology, and Center for Cancer Prevention Research, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, New Jersey and ² Cancer Institute of New Jersey, New Brunswick, New Jersey

Requests for reprints: Chung S. Yang, Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, 164 Frelinghuysen Road, Piscataway, NJ 08854-8020. Phone: 732-445-3400, ext. 248; Fax: 732-445-0687; E-mail: csyang{at}rci.rutgers.edu.

We investigated the effects of a -tocopherol–rich mixture of tocopherols (-TmT, containing 57% -T, 24% -T, and 13% -T) on colon carcinogenesis in azoxymethane (AOM)/dextran sulfate sodium (DSS)–treated mice. In experiment 1, 6-week-old male CF-1 mice were given a dose of AOM (10 mg/kg body weight, i.p.), and 1 week later, 1.5% DSS in drinking water for 1 week. The mice were maintained on either a -TmT (0.3%)–enriched or a standard AIN93M diet, starting 1 week before the AOM injection, until the termination of experiment. In the AOM/DSS–treated mice, dietary -TmT treatment resulted in a significantly lower colon inflammation index (52% of the control) on day 7 and number of colon adenomas (9% of the control) on week 7. -TmT treatment also resulted in higher apoptotic index in adenomas, lower prostaglandin E2, leukotriene B4, and nitrotyrosine levels in the colon, and lower prostaglandin E2, leukotriene B4, and 8-isoprostane levels in the plasma on week 7. Some of the decreases were observed even on day 7. In experiment 2 with AOM/DSS– treated mice sacrificed on week 21, dietary 0.17% or 0.3% -TmT treatment, starting 1 week before the AOM injection, significantly inhibited adenocarcinoma and adenoma formation in the colon (to 17-33% of the control). Dietary 0.3% -TmT that was initiated after DSS treatment also exhibited a similar inhibitory activity. The present study showed that -TmT effectively inhibited colon carcinogenesis in AOM/DSS–treated mice, and the inhibition may be due to the apoptosis-inducing, anti-inflammatory, antioxidative, and reactive nitrogen species–trapping activities of tocopherols.

Key Words: -Tocopherol • tocopherol mixture • colon carcinogenesis • inflammation

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