Linked Life Data

19828633

Source:http://linkedlifedata.com/resource/pubmed/id/19828633

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pubmed-article:19828633pubmed:abstractTextChronic alcohol consumption leads to liver inflammation and cirrhosis. Alcoholic liver disease patients have increased levels of hepatic RANTES/CCL5. However, less is known about the molecular mechanisms for ethanol-induced RANTES up-regulation. In this study, we observed that liver sinusoidal endothelial cells derived from ethanol-fed rats (E-rLSECs) showed severalfold increases in RANTES and hypoxia-inducible factor 1alpha (HIF-1alpha) mRNAs compared with control rLSECs (C-rLSECs). Similar effects were seen in acute ethanol treatment of isolated rLSECs and human dermal microvascular endothelial cells. Ethanol-induced RANTES mRNA expression required ethanol metabolism, p38 MAPK, HIF-1alpha, and JNK-2, but not JNK-1. EMSA experiments showed increased HIF-1alpha binding to wild-type hypoxia response elements (HREs; -31 to -9 bp) within the RANTES promoter in response to ethanol. RANTES promoter analysis showed that cis elements proximal to the transcription start site, HRE-1 (nt -22 to -19), HRE-2 (nt -32 to -29), and AP-1 (nt -250 to -244) were required for ethanol-mediated RANTES expression. These results were corroborated by chromatin immunoprecipitation assays showing augmented HIF-1alpha binding to HRE-1. Additionally, promoter analysis revealed c-Jun, c-Jun/c-Fos, and JunD, but not JunB, bound to the AP-1 site of the RANTES promoter. Ethanol-mediated activation of NF-kappaB led to HIF-1alpha activation and concomitant RANTES expression. Plasma of ethanol-fed c-Jun(flox/flox)-Mx-1-Cre mice showed attenuated levels of RANTES compared with ethanol-fed control mice, supporting the role of c-Jun in ethanol-induced RANTES expression. Our studies showed that ethanol-mediated RANTES/CCL5 expression occurs via HIF-1alpha activation independently of hypoxia. The identification of HIF-1alpha and AP-1 in ethanol-induced RANTES expression provides new strategies to ameliorate ethanol-induced inflammatory responses.lld:pubmed
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pubmed-article:19828633pubmed:articleTitleEthanol augments RANTES/CCL5 expression in rat liver sinusoidal endothelial cells and human endothelial cells via activation of NF-kappa B, HIF-1 alpha, and AP-1.lld:pubmed
pubmed-article:19828633pubmed:affiliationDepartment of Biochemistry and Molecular Biology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.lld:pubmed
pubmed-article:19828633pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:19828633pubmed:publicationTypeResearch Support, N.I.H., Extramurallld:pubmed
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