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Pro-oxidant-mediated hepatic fibrosis and effects of antioxidant intervention in murine dietary steatohepatitis.

Abstract：

:The mechanistic significance of oxidative stress to fibrogenesis in the methionine and choline-deficient (MCD) diet-induced model of steatohepatitis was evaluated by antioxidant intervention, using either vitamin E or L-2-oxothiazolidine-4-carboxylate (OTC), a cysteine precursor that promotes glutathione synthesis. Significant depletion of hepatic reduced glutathione (GSH) and elevation of thiobarbituric acid reactive substances (TBARS) occurred from week 3 in association with hepatic injury in mice fed the MCD diet. Hepatic stellate cell (HSC) activation and increased collagen alpha1(I) mRNA expression, together with morphologic fibrosis were evident from week 5. Vitamin E repleted GSH, reduced TBARS, steatosis, inflammation, HSC activation and collagen alpha1(I) mRNA expression, and ameliorated fibrosis. Vitamin E did not effect the expression of either profibrogenic cytokines (transforming growth factor-beta 1, connective tissue growth factor) or matrix remodeling enzymes (tissue inhibitor of metalloproteinase-1 and -2, matrix metalloproteinase-2 and -13). Despite repletion of hepatic GSH in OTC-supplemented mice, the initial benefit in the reduction of hepatic TBARS and inhibition of collagen alpha1(I) mRNA expression at week 5, failed to protect these mice from hepatic injury or fibrosis at later time points. Oxidative stress or products of lipid peroxidation mediate HSC activation and collagen gene expression directly in the MCD model of steatohepatitis. Vitamin E but not glutathione augmentation can interrupt this pathogenic process.

journal_name

Int J Mol Med

journal_title

International journal of molecular medicine

authors

Phung N,Pera N,Farrell G,Leclercq I,Hou JY,George J

doi

10.3892/ijmm_00000220

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

171-80

issue

2

eissn

1107-3756

issn

1791-244X

journal_volume

24

pub_type

杂志文章

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