Abstract
Supranutrition dietary levels of the element selenium (Se) that have been shown to reduce or retard tumor development resulting from transplantation. The rat placental form of glutathione-S-transferase (GST-p) has been reported to be a good marker for preneoplastic or neoplastic lesions. Four groups of rats with glioma were exposed to Se-free, 0.05, 2.0, and 4.0 ppm sodium selenite GST-p was investigated. Normal brain tissue did not differ significantly in all groups. In contrast, GST-p in tumor was significantly higher in Se-free and 4.0-ppm groups compared to 0.5- and 2.0-ppm groups. The concentration of Se in normal brain tissue did not differ significantly in Se-supplement groups. By contrast, Se in tumors was significantly higher in the 0.5- and 2.0-ppm groups compared to the Se-free and 4.0-ppm groups. Mean group survival at 30 d after treatment was determined and compared with previous dietary Se. Survival was significantly longer in the 0.5- and 2.0-ppm groups than in the Se-free and 4.0-ppm groups. The 2.0-ppm group had enhanced survival, similar to the 0.5-ppm group. The Se-free and 4.0-ppm groups might have no protection against carcinogenesis.
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Zhang, Z., Kimura, M. & Itokawa, Y. The decrement of carcinogenesis by dietary selenium and expression of placental form of glutathione-S-transferase in rat glioma. Biol Trace Elem Res 57, 147–155 (1997). https://doi.org/10.1007/BF02778198
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DOI: https://doi.org/10.1007/BF02778198