Role of oregano on bacterial enzymes in 1,2-dimethylhydrazine-induced experimental colon carcinogenesis

T Srihari, V Balasubramaniyan, N Nalini
Canadian Journal of Physiology and Pharmacology 2008, 86 (10): 667-74
Colon cancer incidence is higher in developed countries than in developing countries. We determined the effect of oregano (Origanum vulgare L.) on fecal bacterial enzyme activities in 1,2-dimethylhydrazine (DMH)-induced experimental colon carcinogenesis in rats. Male Wistar albino rats were divided into 6 groups and all animals were fed with a high-fat diet (20% fat in the diet). Group 1 served as control and group 2 animals received 60 body weight (b.w.) oregano daily for 15 weeks. To induce colon cancer, DMH (20 b.w.) was injected subcutaneously once a week for the first 4 weeks (groups 3-6). In addition, oregano was administered at 20, 40, or 60 b.w. each day orally for the entire 15 weeks (groups 4-6). We analyzed the fecal bacterial enzyme activities and found it to be significantly higher in the group treated with DMH alone than in the control group. Oregano supplementation at all 3 doses significantly suppressed the bacterial enzyme activities and modulated oxidative stress significantly compared with the unsupplemented DMH-treated group. Results of our present investigation therefore revealed that oregano markedly inhibited DMH-induced colon carcinogenesis and that the optimal dose of 40 b.w. was more effective than either the higher or lower doses.

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