| Leptin is key to peroxynitrite-mediated oxidative stress and Kupffer cell activation in experimental nonalcoholic steatohepatitis. | |
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MedLine Citation:
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PMID: 23207144 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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BACKGROUND AND AIMS: Progression from steatosis to steatohepatitic lesions is hypothesized to require a second hit. These lesions have been associated with increased oxidative stress, often ascribed to high levels of leptin and other proinflammatory mediators. Here we have examined the role of leptin in inducing oxidative stress and Kupffer cell activation in CCl(4)-mediated steatohepatitic lesions of obese mice. METHODS: Male C57BL/6 mice fed with a high fat diet (60%kcal) at 16 weeks were administered CCl(4) to induce steatohepatitic lesions. Approaches included use of immuno-spin trapping for measuring free radical stress, gene-deficient mice for leptin, p47 phox, iNOS and adoptive transfer of leptin primed macrophages in vivo. RESULTS: Diet-induced obese (DIO) mice, treated with CCl(4) increased serum leptin levels. Oxidative stress was significantly elevated in DIO mice liver but not in OB/OB mice, or in DIO mice treated with leptin antibody. In OB/OB mice, leptin supplementation restored markers of free radical generation. Markers of free radical formation were significantly decreased by the peroxynitrite decomposition catalyst FeTPPS, the iNOS inhibitor 1400W, the NADPH oxidase inhibitor apocynin, or in iNOS or p47 phox-deficient mice. These results correlated with the decreased expression of TNF-alpha and MCP-1. Kupffer cell depletion eliminated oxidative stress and inflammation, whereas in macrophage-depleted mice, the adoptive transfer of leptin-primed macrophages significantly restored inflammation. CONCLUSIONS: These results, for the first time, suggest that leptin action in macrophages of steatotic liver through induction of iNOS and NADPH oxidase caused peroxynitrite-mediated oxidative stress thus activating Kupffer cells. |
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Authors:
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Saurabh Chatterjee; Douglas Ganini; Erik J Tokar; Ashutosh Kumar; Suvarthi Das; Jean Corbett; Maria Kadiiska; Michael Waalkes; Anna Mae Diehl; Ronald P Mason |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-11-30 |
Journal Detail:
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Title: Journal of hepatology Volume: - ISSN: 1600-0641 ISO Abbreviation: J. Hepatol. Publication Date: 2012 Nov |
Date Detail:
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Created Date: 2012-12-4 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8503886 Medline TA: J Hepatol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2012. Published by Elsevier B.V. |
Affiliation:
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Environmental Health and Disease Laboratory, Department of Environmental Health Sciences, University of South Carolina, Columbia 29208 USA; Free Radical Metabolism Group, Laboratories of Toxicology and Pharmacology, National Institute of Environmental Health Sciences, Research Triangle Park, 27709. Electronic address: schatt@mailbox.sc.edu. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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