selenium can protect against tumorigenesis
The Journal of Nutrition Vol. 129 No.
1 January 1999, pp. 63-69
The Chemical Form of Selenium Influences
3,2'-Dimethyl-4-aminobiphenyl-DNA Adduct Formation in Rat Colon1
Cindy D. Davis2, Yi Feng*, David W. Hein*,
and John W. Finley
United States Department of
Agriculture, Grand Forks Human Nutrition Research Center, Grand Forks, ND
58202-9034 and * University of North Dakota, Departments of Surgery
and Pharmacology and Toxicology, Grand Forks, ND 58202
There is increasing evidence that selenium
can protect against tumorigenesis or preneoplastic lesion development induced
by chemical carcinogens. This study examined whether selenite,
selenate or selenomethionine would be protective against
3,2'-dimethyl-4-aminobiphenyl (DMABP)-DNA adduct formation in the
liver and colon of rats and sought to delineate the mechanism for
the protective effects of the different chemical forms of selenium
against aberrant crypt formation, a preneoplastic lesion for colon
cancer. After injection of DMABP, two DNA adducts were identified in
the liver and colon of rats. Supplementation with either 0.1 or 2.0
mg selenium/kg diet as either selenite or selenate but not
selenomethionine resulted in significantly fewer (53-70%; P
< 0.05) N-(deoxyguanosin-8-yl)-(deoxyguanosin-8-yl)-3,2'-dimethyl-4-aminobiphenyl
(C8-DMABP)-DNA adducts in the colon but not the liver than in rats
fed a selenium-deficient diet. Rats supplemented with selenomethionine had
greater (P < 0.05) plasma and liver selenium concentrations and
glutathione peroxidase activity than those supplemented with selenite
or selenate; however, they also had more DMABP-DNA adducts. The
protective effect of selenite and selenate against DMABP-DNA adduct
formation apparently is not a result of alterations in plasma or
liver selenium concentrations or altered glutathione peroxidase or
glutathione transferase activities but may be related to differences
in the metabolism of the different forms of selenium.
KEY
WORDS: selenium · rats · DNA adducts · colon cancer
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