Abstract
Vitamin E deficiency in rats led to a sequence of antioxidant defense adaptations in the liver. After three weeks, α-tocopherol concentration was 5% of control, but ascorbate and ubiquinol concentrations were 2- to 3-fold greater than control. During the early phase of adaptation no differences in markers of lipid peroxidation were observed, but the activities of both cytochrome b5 reductase and glucose-6-phosphate dehydrogenase were significantly greater in deficient livers. By nine weeks, accumulation of lipid peroxidation end products began to occur along with declining concentrations of ascorbate, and higher NQO1 activities. At twelve weeks, rat growth ceased, and both lipid peroxidation products and cytosolic calcium-independent phospholipase A2 reached maximum concentrations. Thus, in growing rats the changes progressed from increases in both ubiquinol and quinone reductases through accumulation of lipid peroxidation products and loss of endogenous antioxidants to finally induction of lipid metabolizing enzymes and cessation of rat growth.
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Cabo, R.d., Burgess, J.R. & Navas, P. Adaptations to oxidative stress induced by vitamin E deficiency in rat liver. J Bioenerg Biomembr 38, 309–317 (2006). https://doi.org/10.1007/s10863-006-9050-1
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DOI: https://doi.org/10.1007/s10863-006-9050-1