Lack of chemopreventive efficacy of DL-selenomethionine in colon carcinogenesis.

  • Authors: B S Reddy, Y Hirose, R A Lubet, V E Steele, G J Kelloff, C V Rao
  • View Affiliations

  • Published online on: Saturday, April 1, 2000
  • Pages: 327-357
  • DOI: 10.3892/ijmm.5.4.327

Abstract

Epidemiologic observations and laboratory research have suggested that dietary selenium reduces the risk of colon cancer. Selenium-enriched brewer's yeast as a dietary supplement reduces the incidence of and mortality from cancer of the colon in humans. It is not clear whether the observed inhibitory effect is due to selenomethionine, or to other forms of selenium, or to a mixture of the selenium compounds present in selenium-enriched brewer's yeast. Therefore, bioassay described in this study examined the chemopreventive efficacy of 10 and 15 ppm selenomethionine, equivalent to 3.6 and 5.4 ppm as selenium, against azoxymethane (AOM)-induced colon carcinogenesis. At five weeks of age, groups of male F344 rats were fed diets containing 0 (control diet), 10 or 15 ppm selenomethionine. At seven and eight weeks of age, all rats except those in vehicle-treated groups received s.c. injections of AOM at a dose rate of 15 mg/kg body wt. The rats were maintained on their respective diets for 52 weeks and were then sacrificed. Colon tumors were processed and evaluated histopathologically. Colon tumor incidence and multiplicity were analyzed statistically. No obvious toxic effects were observed following dietary administration of 10 or 15 ppm selenomethionine as indicated by body weight gain. Administration of 10 or 15 ppm selenomethionine had no significant effect on colon tumor incidence and multiplicity. This study suggests that i) selenomethionine lacks chemopreventive efficacy against AOM-induced colon carcinogenesis and ii) other forms of selenium or a mixture of selenium compounds present in selenium-enriched brewer's yeast need to be evaluated for their chemopreventive efficacy.
Journal Cover

April 2000
Volume 5 Issue 4

Print ISSN: 1107-3756
Online ISSN:1791-244X

2012 Impact Factor: 1.957
Ranked #26/121 Medicine Research and Experimental
(total number of cites)

Sign up for eToc alerts

Recommend to Library

Copy and paste a formatted citation
APA
Reddy, B., Hirose, Y., Lubet, R., Steele, V., Kelloff, G., & Rao, C. (2000). Lack of chemopreventive efficacy of DL-selenomethionine in colon carcinogenesis.. International Journal of Molecular Medicine, 5(4), 327-357.
MLA
Reddy, Hirose, Lubet, Steele, Kelloff, and C V Rao. "Lack of chemopreventive efficacy of DL-selenomethionine in colon carcinogenesis.." International Journal of Molecular Medicine International Journal of Molecular Medicine 5.4 (2000): 327-357.
Chicago
Reddy, Hirose, Lubet, Steele, Kelloff, and C V Rao. "Lack of chemopreventive efficacy of DL-selenomethionine in colon carcinogenesis.." International Journal of Molecular Medicine International Journal of Molecular Medicine 5 no. 4 (2000): 327-357.