Carcinogenesis Advance Access published online on September 30, 2004
Carcinogenesis, doi:10.1093/carcin/bgh290
© 2004 by Oxford University Press
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1 Department of Laboratory Medicine, Division of Pathology, F46, Karolinska Institutet, Karolinska University Hospital in Huddinge, SE-141 86 Stockholm, Sweden
* To whom correspondence should be addressed. E-mail: lennart.eriksson{at}labmed.ki.se.
Previous studies in animals and humans have shown that selenium compounds can prevent cancer development. In this work we studied the tumor preventive effect of selenium supplementation, administrated as selenite, in the initiation, promotion and progression phases in a synchronised rat model for chemically induced hepatocarcinogenesis, the resistant hepatocyte model. Selenite in supra-nutritional but subtoxic doses (1 and 5 ppm) was administrated to the animals through the drinking water. Such supplementation during the initiation phase did not have tumor preventive effect. However, selenite treatment during the promotion phase decreased the volume fraction of preneoplastic liver nodules from 38% in control animals to 25% (1 ppm) and 14% (5 ppm) in the selenite-supplemented groups. In addition the cell proliferation within the nodules decreased from 42% in control to 22% (1 ppm) and 17% (5 ppm). Immunohistochemical staining for the selenoenzyme thioredoxin reductase 1 (TrxR1) revealed an increased expression of the enzyme in liver nodules compared to the surrounding tissue. The activity was reduced to 50% in liver homogenates from selenium treated animals but the activity of the selenoenzyme glutathione peroxidase was essentially unaltered. Selenite treatment (5 ppm) during the progression phase resulted in significantly lower volume fraction of liver tumors (14% compared to 26 %) along with a decrease of cell proliferation within the tumors (34 % compared to 63 %). Taken together our data indicate that the carcinogenetic process may be prevented by selenium supplementation both during the promotion and the progression phase.
Revised August 28, 2004
Accepted September 17, 2004
MOLECULAR EPIDEMIOLOGY AND CANCER PREVENTION
Selenium prevents tumor development in a rat model for chemical carcinogenesis
2 Danish Veterinary and Food Administration, Institute of Food Research and Nutrition, Soborg, Denmark
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