Effects of N-acetylcysteine on ethanol-induced hepatotoxicity in rats fed via total enteral nutrition
Effects of N-acetylcysteine on ethanol-induced hepatotoxicity in rats fed via total enteral nutrition
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DOI：
10.1016/j.freeradbiomed.2005.04.011
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发表时间：
2005-09-01
影响因子：
7.4
通讯作者：
Badger, TM
中科院分区：
文献类型：
--
作者：
Ronis, MJJ;Butura, A;Badger, TM
The effects of the dietary antioxidant N-acetylcysteine (NAC) on alcoholic liver damage were examined in a total enteral nutrition (TEN) model of ethanol toxicity in which liver pathology occurs in the absence of endotoxemia. Ethanol treatment resulted in steatosis, inflammatory infiltrates, occasional foci of necrosis, and elevated ALT in the absence of increased expression of the endotoxin receptor CD14, a marker of Kupffer cell activation by LPS. In addition, ethanol treatment induced CYP2E1 and increased TNF alpha and TGF beta mRNA expression accompanied by suppressed hepatic IL-4 mRNA expression. Ethanol treatment also resulted in the hepatic accumulation of malondialdehyde (MDA) and hydroxynonenal (FINE) protein adducts, decreased antioxidant capacity, and increased antibody titers toward serum hydroxyethyl radical (HER), MDA, and HNE adducts. NAC treatment increased cytosolic antioxidant capacity, abolished ethanol-induced lipid peroxidation, and inhibited the formation of antibodies toward HNE and HER adducts without interfering with CYP2E1 induction. NAC also decreased ethanol-induced ALT release and inflammation and prevented significant loss of hepatic GSH content. However, the improvement in necrosis score and reduction of TNF alpha mRNA elevation did not reach statistical significance. Although a direct correlation was observed among hepatic MDA and HNE adduct content and TNF alpha mRNA expression, inflammation, and necrosis scores, no correlation was observed between oxidative stress markers or TNF alpha and steatosis score. These data suggest that ethanol-induced oxidative stress can contribute to inflammation and liver injury even in the absence of Kupffer cell activation by endotoxemia. (c) 2005 Elsevier Inc. All rights reserved.
