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| Content Provider | PubMed Central |
|---|---|
| Author | Philippe, Costet Lalanne, Florent Gerbod-giannone, Marie C. Molina, Jennifer R. Fu, Xuan Lund, Erik G. Gudas, Lorraine J. Tall, Alan R. |
| Copyright Year | 2003 |
| Abstract | ABCA1, the mutant molecule in Tangier Disease, mediates efflux of cellular cholesterol to apoA-I and is induced by liver X receptor (LXR)/retinoid X receptor (RXR) transcription factors. Retinoic acid receptor (RAR) activators (all-trans-retinoic acid [ATRA] and TTNPB) were found to increase ATP-binding cassette transporter 1 (ABCA1) mRNA and protein in macrophages. In cellular cotransfection assays, RARγ/RXR activated the human ABCA1 promoter, via the same direct repeat 4 (DR4) promoter element as LXR/RXR. Chromatin immunoprecipitation analysis in macrophages confirmed the binding of RARγ/RXR to the ABCA1 promoter DR4 element in the presence of ATRA, with weaker binding of RARα/RXR, and no binding of RARβ/RXR. However, in macrophages from RARγ−/− mice, TTNPB still induced ABCA1, in association with marked upregulation of RARα, suggesting that high levels of RARα can compensate for the absence of RARγ. Dose-response experiments with ATRA in mouse primary macrophages showed that other LXR target genes were weakly induced (ABCG1 and SREBP-1c) or not induced (apoE and LXRα). The more specific RAR activator TTNPB did not induce SREBP-1c in mouse primary macrophages or liver. These studies indicate a direct role of RARγ/RXR in induction of macrophage ABCA1. |
| Related Links | http://dx.doi.org/10.1128/mcb.23.21.7756-7766.2003 |
| Ending Page | 7766 |
| Page Count | 11 |
| Starting Page | 7756 |
| File Format | |
| ISSN | 02707306 |
| e-ISSN | 10985549 |
| Journal | Molecular and Cellular Biology |
| Issue Number | 21 |
| Volume Number | 23 |
| Language | English |
| Publisher | American Society for Microbiology |
| Publisher Date | 2003-11-01 |
| Access Restriction | Open |
| Rights Holder | American Society for Microbiology |
| Subject Keyword | Cell Biology Molecular Biology Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology |
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