cis-Acting elements and trans-acting factors in the transcriptional regulation of raf kinase inhibitory protein expression
| Autor: | Ou Wang, Guohua Jiang, Jingchao Qin, Sheng Sun, Shuaishuai Liu, Wei Zhang, Boyan Zhang, Jian Kuang, Huitu Liu |
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| Rok vydání: | 2013 |
| Předmět: |
Transcription
Genetic Molecular Sequence Data lcsh:Medicine Phosphatidylethanolamine Binding Protein CREB Transcription (biology) Transcriptional regulation Humans lcsh:Science Cyclic AMP Response Element-Binding Protein Transcription factor Melanoma Regulation of gene expression Sp1 transcription factor Multidisciplinary Binding Sites biology Base Sequence lcsh:R Promoter Gene Expression Regulation Neoplastic Cancer research biology.protein lcsh:Q Trans-acting HeLa Cells Research Article |
| Zdroj: | PLoS ONE PLoS ONE, Vol 8, Iss 12, p e83097 (2013) |
| ISSN: | 1932-6203 |
| Popis: | The Raf kinase inhibitory protein (RKIP) is down-regulated in multiple types of human cancers. Decreased RKIP transcription activity may be one of the major mechanisms responsible for the downregulation of RKIP expression in human diseases. To test this hypothesis, we need to gain basic knowledge of the transcriptional regulation of RKIP. To achieve this objective, we made a systematic effort to identify cis-acting elements and trans-acting factors that control RKIP promoter activity. We found that full RKIP promoter activity requires the region -56 to +261 relative to the transcription start site. Within the full promoter region, there are two motifs rich in G/C that responded to transcription factor Sp1, one cAMP-responsive element that responded to the transcription factor CREB, and one docking site for the histone acetylase p300. In human melanoma A375 cells and human cervical cancer HeLa cells, mutation or deletion of each of these cis-acting elements decreased promoter activity. In A375 cells, knockdown of the corresponding transcription factors Sp1, CREB, or p300 decreased RKIP promoter activity, whereas overexpression of CREB and p300 increased RKIP promoter activity. The results obtained with HeLa cells also supported the idea that Sp1 and CREB play positive roles in the regulation of RKIP transcription. These findings suggest that regulators of the expression or activity of Sp1, CREB, and p300 are involved in regulating RKIP transcription. |
| Databáze: | OpenAIRE |
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