Vitamin E depletion enhances liver oxidative damage in rats with water-immersion restraint stress
2013
Ohta, Y. (Fujita Health University School of Medicine, Toyoake, Aichi (Japan). Department of Chemistry) | Yashiro, K. | Ohashi, K. | Imai, Y. | Kusumoto, C. | Matsura, T. | Hidaka, M. | Fukuzawa, K.
We examined the effect of vitamin E depletion on liver oxidative damage in rats with water-immersion restraint stress (WIRS). Male Wistar rats were fed a normal diet (N) or vitamin E-depleted diet (VE-D) for 4 wk. N- and VE-D-fed rats were exposed to WIRS for 6 h. The activities of serum transaminases and lactate dehydrogenase and serum ascorbic acid concentration were similar in both diet groups. WIRS exposure increased these serum enzyme activities and the serum ascorbic acid concentration in both diet groups but the ratios of these increases were higher in VE-D-fed rats than in N-fed rats. Serum and liver alpha-tocopherol concentrations in VE-D-rats were approximately 50% and 30% of those in N-fed rats, respectively. WIRS exposure reduced liver alpha-tocopherol concentration in VE-D-fed rats, but not in N-fed rats. Liver ascorbic acid and reduced glutathione concentrations were higher in the VE-D-fed group than in the N-fed group. WIRS exposure reduced liver ascorbic acid and reduced glutathione concentrations in both diet groups. There were no differences in liver concentrations of coenzyme Qsub(9) or coenzyme Qsub(10) in the reduced form between the N- and VE-D-fed groups. WIRS exposure reduced liver concentrations of coenzyme Qsub(9) and coenzyme Qsub(10) in the reduced form in both diet groups. Liver lipid peroxide concentration was higher in the VE-D-fed group than in the N-fed group. WIRS exposure raised liver lipid peroxide concentration more in the VE-D-fed group than in the N-fed group. These results indicate that vitamin E depletion enhances liver oxidative damage in rats with WIRS.
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