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- W62223673 abstract "The authors have reported that chronic ethanol (Et) feeding in the micropig results in changes in antioxidant defense including reductions in liver CuZnSOD and GSHPX activities, in vitamin E and A levels, and increases in liver MnSOD activity. Despite these alterations, liver mitochondria (mit) and microsome (mic) TBARS were lower in Et-fed than control (C) pigs. The significance of lower TBARS is unclear since the saturated to PUFA ratio was higher in mit and mic from Et than from C pigs. Thus in the current study they measured a non-lipid target of oxidative damage. Glutamine synthetase (GS) activity was measured as this protein is an excellent marker for oxidative damage due to the sensitivity of histidine residues to free radicals at the active site. Micropigs were fed high PUFA diets containing 40% of kcals as either Et or cornstarch (C) and 34% of kcals as corn oil. After 12 mo pigs were killed and livers removed. Fatty infiltration, inflammation and necrosis were observed in livers from Et pigs by 5 mo; collagen infiltration was apparent in 2 pigs by 12 mo. Et pigs had GS activities that were 90% lower than C pigs. The finding that liver Mn levels weremore » higher in Et than in C pigs suggests that the low GS activity is not due to a reduction in Mn availability, although a shift in the distribution of Mn from GS to MnSOD may be involved. These data support the idea that chronic Et feeding is associated with oxidative damage and underscore the need to evaluate non-lipid targets as markers for oxidative damage.« less" @default.
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- W62223673 date "1992-02-26" @default.
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- W62223673 title "Liver glutamine synthetase activity is markedly reduced in chronic ethanol-fed micropigs" @default.
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