Abstract
In the present study, we have evaluated the effects of dietary selenite (Se) on polyamine levels and its influence on N-nitrosodiethylamine (DEN) initiated and Phenobarbital (PB) promoted in rat liver carcinogenesis. Dietary selenite at a concentration of 4 ppm (through drinking water) was administered in rats either before initiation (4 weeks), or during promotion (16 weeks) and entire experimental period (20 weeks). Male Wistar strain of albino rats was treated with single intra peritoneal dose of DEN (200 mg kg−1 body weight), after 2 weeks the carcinogenic effect was promoted by PB (0.05%; through diet). Alpha fetoprotein (AFP) was investigated after the 20th-week of experimental period. Selenite-treated animals markedly reduced the AFP during the time of pre-selenite [before initiation (4 weeks)] and entire experimental period (20 weeks), administration rather than the promotion period. This infers that anticancer property of selenite depends on the stage of carcinogenesis, rather than duration of treatment. Evaluation of polyamine levels in hepatoma and surrounding liver tissue showed significant difference in the selenite-treated groups compared with pair-fed control groups. Furthermore, histopathological examination showing remarkable difference between control and treated groups. These results demonstrate that selenite can modulate the development of DEN-induced and PB-promoted rat liver carcinogenesis through a polyamine-dependent mechanism. (Mol Cell Biochem xxx: 165–172, 2005)
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Abbreviations
- DEN:
-
N-nitrosodiethylamine
- PB:
-
Phenobarbital
- AFP:
-
Alpha-fetoprotein
- Se:
-
Selenium
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Thirunavukkarasu, C., Premkumar, K., Jagadeeswaran, R. et al. The inhibitory effect of sodium selenite on N-nitrosodiethylamine-induced and phenobarbital promoted liver tumourigenesis in rats based on the modulation of polyamine levels. Mol Cell Biochem 280, 165–172 (2005). https://doi.org/10.1007/s11010-005-8907-7
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DOI: https://doi.org/10.1007/s11010-005-8907-7