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Deguelin suppresses the formation of carcinogen‐induced aberrant crypt foci in the colon of CF‐1 mice
Author(s) -
Murillo Genoveva,
Kosmeder Jerome W.,
Pezzuto John M.,
Mehta Rajendra G.
Publication year - 2003
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.10901
Subject(s) - aberrant crypt foci , carcinogen , in vivo , chemistry , body weight , tumor promotion , pharmacology , crypt , carcinogenesis , medicine , colorectal cancer , biology , biochemistry , cancer , microbiology and biotechnology , colonic disease , gene
Deguelin [(7a S ,Ba S )‐13,13a‐dihydro‐9,10‐dimethoxy‐3,3‐dimethyl‐3 H ‐Bis[1]benzopyrano[3,4‐b:6′,5′‐ e ]pyran‐7(7a H )‐one], a naturally occurring rotenone, has shown chemopreventive efficacy in several in vivo and in vitro models. In this report, the effectiveness of deguelin at inhibiting the development of AOM‐induced colonic ACF was investigated in CF‐1 mice. Loss of hex activity was assessed as a second biomarker. In an initial experiment, animals were given s.c. injections of AOM (10 mg/kg body weight) once a week for 2 weeks to induce ACF. Deguelin and vehicle (corn oil) were administered i.g. 7 days a week. Treatment was initiated 2 weeks prior to the first dose of carcinogen and continued for the duration of the study. The mean number of ACF for the control group was 29.0 ± 4.3, whereas the mean numbers of ACF in the deguelin groups were 24.8 ± 2.7, 7.2 ± 1.5 and 4.6 ± 1.4 at doses of 2.5, 5.0 and 10.0 mg/kg body weight, respectively. In a similar manner, treatment with deguelin significantly ( p < 0.001) suppressed the appearance of hex − crypts in a dose‐dependent manner. In a second study, the ability of deguelin to block the initiation and promotion stages of colon carcinogenesis was investigated. Greatest inhibition was observed when deguelin was administered during the promotional stage (73.3%, p < 0.001). These results demonstrate that deguelin is an efficacious chemopreventive agent against colon carcinogenesis. © 2002 Wiley‐Liss, Inc.