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pubmed-article:2123402pubmed:abstractTextAlloxan-diabetic rats and age-matched controls were killed after 6 weeks of diabetes; heart and kidneys were removed and assayed for thiobarbituric acid-reactive substances (TBARS), lipid hydroperoxides, lipid phosphorus, total fatty acid composition and glutathione. Tissue homogenates from a second group of diabetic and control rats were incubated in oxygen-saturated buffer with and without the free radical generating system Fe2+/ascorbate (0.1/1.0 mM) and were assayed for lipid peroxidation. Diabetic hearts contained markedly lower levels of TBARS and lipid hydroperoxides (40% and 18%, respectively) than control hearts, whereas differences in TBARS were less pronounced in kidneys (9%). Incubation of homogenates of both organs in the presence or absence of Fe2+/ascorbate for up to 2 h yielded significantly lower levels of TBARS and lipid hydroperoxides with diabetic tissue. Diabetic hearts and kidneys contained higher levels of glutathione (28% and 13% over controls) and both diabetic tissues showed much higher linoleate/arachidonate ratios than did the controls (9.86 vs. 2.56 for heart, 2.01 vs. 0.86 for kidney). We conclude that diabetic tissues develop enhanced defense systems against oxidative stress and we assume tha the lower levels of arachidonate contribute to their resistance to lipid peroxidation as well.lld:pubmed
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pubmed-article:2123402pubmed:articleTitleDiabetic heart and kidney exhibit increased resistance to lipid peroxidation.lld:pubmed
pubmed-article:2123402pubmed:affiliationHormel Institute, University of Minnesota, Austin 55912.lld:pubmed
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