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Exercise training attenuates hepatic inflammation, fibrosis and macrophage infiltration during diet induced-obesity in mice.
MedLine Citation:
PMID:  22554494     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Nonalcoholic steatohepatitis, which is considered the hepatic event in metabolic syndrome, was recently associated with the innate immune system. Although regular exercise reduces hepatic injury markers like serum alanine aminotransferase (ALT) levels, the mechanisms regulating the effects of exercise on steatohepatitis are unclear. This study aimed to clarify whether exercise training suppresses hepatic injury, inflammation, and fibrosis by suppressing macrophage infiltration. Male C57BL/6J (4-week old) mice were randomly divided into four groups: normal diet (ND) control (n=7), ND exercise (n=5), high-fat diet and high-fructose water (HFF) control (n=11), and HFF exercise (n=11) groups. Mice were fed the ND or HFF from 4 to 20weeks of age. The exercise groups were trained on a motorized treadmill for 60min/day, five times/week. The nonalcoholic fatty liver disease (NAFLD) activity score and plasma ALT activity, indicators of liver injury, were increased in HFF control mice but were attenuated in HFF exercise mice. Hepatic inflammation, indicated by hepatic tumor necrosis factor (TNF)-α levels and hepatic resident macrophage infiltration, was significantly lower in HFF exercise mice than in HFF control mice. Hepatic fibrosis markers (histological hepatic fibrosis detected by Sirius red and α-smooth muscle actin staining and tissue inhibitor of matrix metalloproteinase-1 mRNA) were attenuated in HFF exercise mice compared with HFF control mice. These results suggest that exercise training reduces hepatic inflammation, injury, and fibrosis by suppressing macrophage infiltration.
Authors:
Noriaki Kawanishi; Hiromi Yano; Tsubasa Mizokami; Masaki Takahashi; Eri Oyanagi; Katsuhiko Suzuki
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-23
Journal Detail:
Title:  Brain, behavior, and immunity     Volume:  -     ISSN:  1090-2139     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-5-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8800478     Medline TA:  Brain Behav Immun     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Inc. All rights reserved.
Affiliation:
Graduate School of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan; Research Fellow of the Japan Society for the Promotion of Sciences, Kurashiki, Okayama, Japan.
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