Abstract:
BACKGROUND AND AIM:Exogenous 8-hydroxydeoxyguanosine (8-OHdG) was suggested as an inhibitor of Rac1 and NADPH oxidase (NOX). The aim of this study was to evaluate the effects of the exogenous 8-OHdG on hepatic fibrogenesis in vitro and in vivo model of liver fibrosis. METHODS:Adult Sprague-Dawley rats were allocated to sham-operated rats (n = 7), rats that underwent bile duct ligation (BDL) (n = 6), and BDL rats treated with 8-OHdG (60 mg/kg/day by gavage, n = 6). All rats were sacrificed on day 21. Double immunofluorescence staining between either NOX1 or NOX2 and α-smooth muscle actin (SMA) in liver was performed. Hepatic fibrotic contents were assessed by hydroxyproline assay and quantified by Sirius red staining. In vitro, hepatic stellate cell (HSC) line LX-2 and HHSteC cells were stimulated by angiotensin II (10 μM). The reactive oxygen species (ROS) production was measured by confocal microscopy. The expressions of NOX1, NOX2, α-SMA, transforming growth factor (TGF)-β1, and collagen Iα were analyzed by quantitative real-time polymerase chain reaction or immunoblotting. RESULTS:The 8-OHdG treatment in BDL rats reduced the NOX1 and NOX2 protein expression, which overlapped with α-SMA compared with BDL rats. The 8-OHdG treatment in BDL rats significantly decreased the mRNA expression of NOX1, NOX2, α-SMA, TGF-β1, and collagen Iα, and fibrotic contents. Increases of ROS production, Rac1 activation, NOX1, NOX2, and fibronectin expression induced by angiotensin II in HSCs were attenuated by 8-OHdG. CONCLUSIONS:Rac1 activation and NOX-derived ROS are implicated to liver fibrosis. The 8-OHdG ameliorates liver fibrosis through the inhibition of Rac1 activation and NOX-derived ROS.
journal_name
J Gastroenterol Hepatoljournal_title
Journal of gastroenterology and hepatologyauthors
Shin SK,Kim KO,Kim SH,Kwon OS,Choi CS,Jeong SH,Kim YS,Kim JH,Chung MHdoi
10.1111/jgh.14979subject
Has Abstractpub_date
2020-06-01 00:00:00pages
1078-1087issue
6eissn
0815-9319issn
1440-1746journal_volume
35pub_type
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journal_title:Journal of gastroenterology and hepatology
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doi:10.1046/j.1440-1746.2001.02462.x
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doi:10.1111/j.1440-1746.1993.tb01647.x
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journal_title:Journal of gastroenterology and hepatology
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journal_title:Journal of gastroenterology and hepatology
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journal_title:Journal of gastroenterology and hepatology
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journal_title:Journal of gastroenterology and hepatology
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journal_title:Journal of gastroenterology and hepatology
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