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Effect of losartan on early liver fibrosis development in a rat model of nonalcoholic steatohepatitis.

Abstract：

BACKGROUND AND AIM:Nonalcoholic steatohepatitis (NASH) is a metabolic disorder of the liver that may evolve into fibrosis or cirrhosis. Recent studies have shown reduction of experimental liver fibrosis with the use of angiotensin-converting-enzyme inhibitors or angiotensin-receptor antagonists. The aim of this study was to determine whether losartan can influence the early phase of fibrogenesis in an animal model of NASH. METHODS:To induce NASH, a choline-deficient diet (CDD) was given to Sprague-Dawley rats for 12 weeks. These animals were then compared with a control group receiving choline-supplemented diet (CSD) and a group fed a CDD plus losartan (10 mg/kg/day). Biochemical (serum levels of alanine aminotransferase and aspartate aminotransferase) and histological evaluation of fatty liver was performed by conventional techniques. Hydroxyproline content in liver tissue was assayed by spectrophotometry. In addition, mRNA levels of procollagen I and transforming growth factor (TGF)-beta were assessed by semiquantitative RT-PCR and stellate cell activation by alpha-actin immunofluorescence stain. RESULTS:After 12 weeks CDD induced a marked elevation of serum aminotranferases, a severe fatty liver infiltration with mild histological inflammation and fibrosis. These findings correlated with a significant increase in mRNA levels of both procollagen I and TGF-beta and significant increased liver hydroxyproline content. No differences were seen between rats receiving CDD alone and rats receiving CDD plus losartan with regard to the biochemical, morphological or molecular alterations induced by the CDD. CONCLUSION:Losartan does not seem to influence liver injury and fibrogenic events in the CDD model of NASH.

journal_name

J Gastroenterol Hepatol

journal_title

Journal of gastroenterology and hepatology

authors

Ibañez P,Solis N,Pizarro M,Aguayo G,Duarte I,Miquel JF,Accatino L,Arrese M

doi

10.1111/j.1440-1746.2006.04700.x

subject

Has Abstract

pub_date

2007-06-01 00:00:00

pages

846-51

issue

6

eissn

0815-9319

issn

1440-1746

pii

JGH4700

journal_volume

22

pub_type

杂志文章

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