| Hepatocyte nuclear factor 1alpha is an accessory factor required for activation of glucose-6-phosphatase gene transcription by glucocorticoids. | |
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MedLine Citation:
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PMID: 9839806 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Deficiency of glucose-6-phosphatase (G6Pase), a key enzyme in glucose homeostasis, causes glycogen storage disease type 1a (GSD-1a), also know as von Gierke disease. Expression of the G6Pase gene is regulated by multiple hormones, including glucocorticoids. The synthetic glucocorticoid dexamethasone increased G6Pase mRNA abundance and gene transcription in H4-IIE hepatoma cells. Transient transfection assays demonstrated that the G6Pase promoter was active in H4-IIE cells only in the presence of dexamethasone. The minimal G6Pase promoter was contained within nucleotides -234/+3, which has two putative glucocorticoid response elements (GREs) at nucleotides -178/-164 (site 1) and -154/-140 (site 2). Electromobility shift and transient transfection assays showed that only GRE site 1 was required for glucocorticoid-activated transcription from the G6Pase promoter. Deletion analysis demonstrated that the DNA elements absolutely essential for glucocorticoid-stimulated transcription from the G6Pase promoter were contained within nucleotides -234/-212, encompassing binding motifs for hepatocyte nuclear factors (HNFs) 1 (-226/-212) and 4 (-231/-220). Electromobility shift and cotransfection assays showed that HNF1alpha bound to its cognate site and mediated transcription activation of the G6Pase gene by glucocorticoids. |
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Authors:
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B Lin; D W Morris; J Y Chou |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: DNA and cell biology Volume: 17 ISSN: 1044-5498 ISO Abbreviation: DNA Cell Biol. Publication Date: 1998 Nov |
Date Detail:
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Created Date: 1998-12-11 Completed Date: 1998-12-11 Revised Date: 2009-11-24 |
Medline Journal Info:
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Nlm Unique ID: 9004522 Medline TA: DNA Cell Biol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 967-74 Citation Subset: IM |
Affiliation:
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Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Base Sequence DNA / metabolism DNA-Binding Proteins* Dexamethasone / pharmacology Gene Expression Regulation, Enzymologic* / drug effects, physiology Glucocorticoids / pharmacology Glucose-6-Phosphatase / genetics* Hepatocyte Nuclear Factor 1 Hepatocyte Nuclear Factor 1-alpha Hepatocyte Nuclear Factor 1-beta Molecular Sequence Data Nuclear Proteins* Promoter Regions, Genetic Protein Binding Rats Receptors, Glucocorticoid / metabolism Transcription Factors / physiology* Tumor Cells, Cultured |
| Chemical | |
Reg. No./Substance:
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0/DNA-Binding Proteins; 0/Glucocorticoids; 0/Hepatocyte Nuclear Factor 1-alpha; 0/Hnf1a protein, rat; 0/Nuclear Proteins; 0/Receptors, Glucocorticoid; 0/Transcription Factors; 126548-29-6/Hepatocyte Nuclear Factor 1; 138674-15-4/Hepatocyte Nuclear Factor 1-beta; 50-02-2/Dexamethasone; 9007-49-2/DNA; EC 3.1.3.9/Glucose-6-Phosphatase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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