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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Eyster, Craig A. Griesel, Beth A. Olson, Ann Louise Knight, John B. |
| Description | Author Affiliation: Knight JB ( Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, P.O. Box 26901, Room 853-BMSB, Oklahoma City, OK 73190, USA.); |
| Abstract | The GLUT4 gene is subject to complex tissue-specific and metabolic regulation, with a profound impact on insulin-mediated glucose disposal. We have shown, by using transgenic mice, that the human GLUT4 promoter is regulated through the cooperative function of two distinct regulatory elements, domain 1 and the myocyte enhancer factor 2 (MEF2) domain. The MEF2 domain binds transcription factors MEF2A and MEF2D in vivo. Domain I binds a transcription factor, GLUT4 enhancer factor (GEF). In this report, we show a restricted pattern of GEF expression in human tissues, which overlaps with MEF2A only in tissues expressing high levels of GLUT4, suggesting the hypothesis that GEF and MEF2A function together to activate GLUT4 transcription. Data obtained from transiently transfected cells support this hypothesis. Neither GEF nor MEF2A alone significantly activated GLUT4 promoter activity, but increased promoter activity 4- to 5-fold when expressed together. Deletion of the GEF-binding domain (domain I) and the MEF2-binding domain prevented activation, strengthening the conclusion that promoter regulation occurs through these elements. GEF and MEF2A, isolated from nuclei of transfected cells, bound domain I and the MEF2 domain, respectively, which is consistent with activation through these regulatory elements. Finally, GEF and MEF2A coimmunoprecipitated in vivo, strongly supporting a mechanism of GLUT4 transcription activation that depends on this protein-protein interaction. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 25 |
| Volume Number | 100 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2003-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | DNA-Binding Proteins Chemistry Gene Expression Regulation Monosaccharide Transport Proteins Genetics Muscle Proteins Promoter Regions, Genetic Transcription Factors Biosynthesis Transcriptional Activation Animals Blotting, Northern Blotting, Western COS Cells Cell Nucleus Metabolism Genes, Reporter Glucose Glucose Transporter Type 4 Glutathione Transferase Green Fluorescent Proteins Luminescent Proteins MADS Domain Proteins MEF2 Transcription Factors Mice Mice, Transgenic Microscopy, Confocal Myogenic Regulatory Factors Precipitin Tests Protein Binding Protein Structure, Tertiary Recombinant Fusion Proteins Tissue Distribution Transcription, Genetic Transfection Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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