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Carcinogenesis, Vol 18, 2155-2161, Copyright © 1997 by Oxford University Press

ARTICLES

Citrus auraptene inhibits chemically induced colonic aberrant crypt foci in male F344 rats

T Tanaka, K Kawabata, M Kakumoto, H Makita, A Hara, H Mori, K Satoh, A Hara, A Murakami, W Kuki, Y Takahashi, H Yonei, K Koshimizu and H Ohigashi
First Department of Pathology, Gifu University School of Medicine, Japan.

The modifying effect of dietary administration of auraptene isolated from the peel of citrus fruit (Citrus natsudaidai Hayata) on the development of azoxymethane (AOM)-induced colonic aberrant crypt foci (ACF) was investigated in rats. Male F344 rats were given s.c. injections of AOM (15 mg/kg body wt) once a week for 3 weeks to induce ACF. They also received diets containing 100 or 500 p.p.m. auraptene for 5 weeks, starting 1 week before the first dose of AOM. At termination of the study (week 5) dietary administration of auraptene caused a significant reduction in the frequency of ACF in a dose- dependent manner (P < 0.05). Feeding of auraptene suppressed expression of cell proliferation biomarkers (5-bromo-2'-deoxyuridine labeling- index, ornithine decarboxylase activity, polyamine content and number of silver stained nucleolar organizer region protein particles) in the colonic mucosa and the occurrence of micronuclei caused by AOM. Also, auraptene increased the activities of phase II enzymes (glutathione S- transferase and quinone reductase) in the liver and colon. These findings might suggest that inhibition of AOM-induced ACF may be associated, in part, with increased activity of phase II enzymes in the liver and colon and suppression of cell proliferation in the colonic mucosa.
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