| C-reactive protein impairs hepatic insulin sensitivity and insulin signaling in rats: Role of mitogen-activated protein kinases. | |
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MedLine Citation:
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PMID: 20967757 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Plasma C-reactive protein (CRP) concentration is increased in the metabolic syndrome, which consists of a cluster of cardiovascular disease risk factors, including insulin resistance. It is not known, however, whether CRP is merely a marker of accompanying inflammation or whether it contributes causally to insulin resistance. The objective of this study is to investigate the role that CRP may play in the development of insulin resistance. We examined the effect of single-dose intravenous administration of purified human (h)CRP on insulin sensitivity in Sprague-Dawley rats using the euglycemic, hyperinsulinemic clamp technique. hCRP was associated with impaired insulin suppression of endogenous glucose production with no reduction in peripheral tissue glucose uptake, suggesting that hCRP mediated insulin resistance in the liver but not extrahepatic tissues. We further assessed components of the insulin signaling pathway and mitogen-activated protein kinases (MAPKs) in the liver. Liver tissues derived from hCRP-treated rats showed reduced insulin-stimulated insulin receptor substrate (IRS) tyrosine phosphorylation, IRS/phosphatidylinositol 3-kinase (PI3K) association, and Akt phosphorylation, consistent with hCRP-induced impairment of hepatic insulin signaling. Furthermore, hCRP enhanced phosphorylation of extracellular signal-regulated kinase (ERK)1/2 and p38 MAPK as well as IRS-1 Ser(612) . Finally, we observed in primary cultured rat hepatocytes that U0126 (a selective inhibitor of MAPK/ERK kinase1/2) corrected hCRP-induced impairment of insulin signaling. Conclusions: hCRP plays an active role in inducing hepatic insulin resistance in the rat, at least in part by activating ERK1/2, with downstream impairment in the insulin signaling pathway. (HEPATOLOGY 2011). |
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Authors:
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Liang Xi; Changting Xiao; Robert H J Bandsma; Mark Naples; Khosrow Adeli; Gary F Lewis |
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Publication Detail:
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Type: Journal Article Date: 2010-10-21 |
Journal Detail:
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Title: Hepatology (Baltimore, Md.) Volume: 53 ISSN: 1527-3350 ISO Abbreviation: Hepatology Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-01-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8302946 Medline TA: Hepatology Country: United States |
Other Details:
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Languages: eng Pagination: 127-35 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 American Association for the Study of Liver Diseases. |
Affiliation:
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Department of Medicine and Physiology, University of Toronto, Toronto, Ontario, Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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