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Article: Fatty acid binding protein-4 (FABP4) is a hypoxia inducible gene that sensitizes mice to liver ischemia/re-perfusion injury

TitleFatty acid binding protein-4 (FABP4) is a hypoxia inducible gene that sensitizes mice to liver ischemia/re-perfusion injury
Authors
Issue Date2015
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhep
Citation
Journal of Hepatology, 2015 How to Cite?
AbstractBACKGROUND & AIMS: Fatty acid binding protein 4 (FABP4) has been known as a mediator of inflammatory response in the macrophages and adipose tissue, but its hepatic function is poorly understood. The goal of this study is to investigate the role of FABP4 in liver ischemia/reperfusion (I/R), a clinical condition involves both hypoxia and inflammation. METHODS: To examine the I/R regulation of FABP4, mice were subjected to I/R surgery before being measured for FABP4 gene expression. Both loss-of-function (by using a pharmacological FABP4 inhibitor) and gain-of-function (by adenoviral overexpression of FABP4) were used to determine the functional relevance of FABP4 expression and its regulation during I/R. To determine the hypoxia responsive regulation of FABP4, primary mouse hepatocytes were exposed to hypoxia. The FABP4 gene promoter was cloned and its regulation by hypoxia inducible factor 1α (HIF-1α) was characterized by luciferase reporter gene, electrophoretic mobility shift, and chromatin immunoprecipitation assays. RESULTS: We found that the hepatic expression of FABP4 was markedly induced by I/R. At the functional level, pharmacological inhibition of FABP4 alleviated the I/R injury, whereas adenoviral overexpression of FABP4 sensitized mice to I/R injury. We also showed that exposure of primary hepatocytes to hypoxia or transgenic overexpression of HIF-1α in the mouse liver was sufficient to induce the expression of FABP4. Our promoter analysis established FABP4 as a novel transcriptional target of HIF-1α. CONCLUSIONS: FABP4 is a hypoxia inducible gene that sensitizes mice to liver I/R injury. FABP4 may represent a novel therapeutic target, and FABP4 inhibitors may be used as therapeutic agents to manage hepatic I/R injury.
Persistent Identifierhttp://hdl.handle.net/10722/213608
ISSN
2015 Impact Factor: 10.59
2015 SCImago Journal Rankings: 4.570

 

DC FieldValueLanguage
dc.contributor.authorHu, B-
dc.contributor.authorGuo, Y-
dc.contributor.authorGarbacz, WG-
dc.contributor.authorJiang, M-
dc.contributor.authorXu, M-
dc.contributor.authorHuang, H-
dc.contributor.authorTsung, A-
dc.contributor.authorBilliar, TR-
dc.contributor.authorRamakrishnan, SK-
dc.contributor.authorShah, M-
dc.contributor.authorLam, KSL-
dc.date.accessioned2015-08-06T08:57:03Z-
dc.date.available2015-08-06T08:57:03Z-
dc.date.issued2015-
dc.identifier.citationJournal of Hepatology, 2015-
dc.identifier.issn0168-8278-
dc.identifier.urihttp://hdl.handle.net/10722/213608-
dc.description.abstractBACKGROUND & AIMS: Fatty acid binding protein 4 (FABP4) has been known as a mediator of inflammatory response in the macrophages and adipose tissue, but its hepatic function is poorly understood. The goal of this study is to investigate the role of FABP4 in liver ischemia/reperfusion (I/R), a clinical condition involves both hypoxia and inflammation. METHODS: To examine the I/R regulation of FABP4, mice were subjected to I/R surgery before being measured for FABP4 gene expression. Both loss-of-function (by using a pharmacological FABP4 inhibitor) and gain-of-function (by adenoviral overexpression of FABP4) were used to determine the functional relevance of FABP4 expression and its regulation during I/R. To determine the hypoxia responsive regulation of FABP4, primary mouse hepatocytes were exposed to hypoxia. The FABP4 gene promoter was cloned and its regulation by hypoxia inducible factor 1α (HIF-1α) was characterized by luciferase reporter gene, electrophoretic mobility shift, and chromatin immunoprecipitation assays. RESULTS: We found that the hepatic expression of FABP4 was markedly induced by I/R. At the functional level, pharmacological inhibition of FABP4 alleviated the I/R injury, whereas adenoviral overexpression of FABP4 sensitized mice to I/R injury. We also showed that exposure of primary hepatocytes to hypoxia or transgenic overexpression of HIF-1α in the mouse liver was sufficient to induce the expression of FABP4. Our promoter analysis established FABP4 as a novel transcriptional target of HIF-1α. CONCLUSIONS: FABP4 is a hypoxia inducible gene that sensitizes mice to liver I/R injury. FABP4 may represent a novel therapeutic target, and FABP4 inhibitors may be used as therapeutic agents to manage hepatic I/R injury.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhep-
dc.relation.ispartofJournal of Hepatology-
dc.titleFatty acid binding protein-4 (FABP4) is a hypoxia inducible gene that sensitizes mice to liver ischemia/re-perfusion injury-
dc.typeArticle-
dc.identifier.emailLam, KSL: ksllam@hku.hk-
dc.identifier.authorityLam, KSL=rp00343-
dc.identifier.doi10.1016/j.jhep.2015.05.030-
dc.identifier.pmid26070408-
dc.identifier.hkuros244415-
dc.publisher.placeNetherlands-

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