Abstract
Antioxidants and reactive oxygen species are considered to play an important role in experimental in vivo carcinogenesis studies. We attempted in this study to evaluate the repercussions on the antioxidant and lipid peroxide status of the growth of human malignant tumors xenografted into athymic mice. We selected three tumor models: two urothelial carcinomas (bladder tumors stage 3) and one brain tumor (glioblastoma stage 4). All these tumors exhibited a fast growth pattern when xenografted into athymic mice. Tumoral tissue was implanted subcutaneously. After growth establishment each tumor size was measured at regular intervals: every 2 d for bladder tumor and twice a week for glioblastoma. The period of observation was 3 wk for bladder tumors and 5 wk for glioblastoma. At the end of the observation period, all mice were sacrificed; tumoral tissue was taken and blood collected. Superoxide dismutase activity (SOD), glutathione peroxidase activity (GSH-Px), zinc (Zn), selenium (Se), and thiobarbituric acid reactive substances (TBARS) were measured in blood. TBARS alone were measured into tumoral tissue. A modification of the antioxidant blood status was observed in mice xenografted with bladder tumors with decrease in Se status and GSH-Px activities, and increase in TBARS. Such an effect was absent in mice xenografted with glioblastoma. It would appear that an oxygen-mediated stress exists in the animal bearing an implanted tumor compared with the control group, and that tumoral tissue itself is able to induce an oxidative stress into its host. All this leads to a disturbance of the antioxidant defense system.
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Gauchez, A.S., Riondel, J., Jacrot, M. et al. Antioxidant status and lipid peroxidation in athymic mice xenografted with two types of human tumors. Biol Trace Elem Res 47, 103–109 (1995). https://doi.org/10.1007/BF02790106
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DOI: https://doi.org/10.1007/BF02790106