Increased glia-specific transgene expression with glial fibrillary acidic protein promoters containing multiple enhancer elements
| Autor: | Maarten ter Horst, Bertie de Leeuw, Rob C. Hoeben, Michael Brenner, Albee Messing, Mark Rodijk, Shingo Iwata, Peter A. E. Sillevis Smitt, Mu Su |
|---|---|
| Přispěvatelé: | Neurology, Immunology |
| Rok vydání: | 2006 |
| Předmět: |
Genetically modified mouse
Transgene Genetic Vectors Gene Expression Mice Nude Mice Transgenic Biology Adenoviridae Mice Cellular and Molecular Neuroscience Glial Fibrillary Acidic Protein Gene expression Animals Humans Transgenes Promoter Regions Genetic Enhancer Gene Regulation of gene expression Glial fibrillary acidic protein Promoter Genetic Therapy beta-Galactosidase Immunohistochemistry Molecular biology Enhancer Elements Genetic Gene Expression Regulation biology.protein Female Neuroglia |
| Zdroj: | Journal of Neuroscience Research, 83(5), 744-753. Wiley-Liss Inc. |
| ISSN: | 1097-4547 0360-4012 |
| DOI: | 10.1002/jnr.20776 |
| Popis: | The ability to direct transgene expression to astrocytes has become increasingly important as the roles for these cells continue to expand. Promoters consisting of the 5'-flanking region of the human or mouse glial fibrillary acidic protein (GFAP) gene have generally proved satisfactory. However, a more powerful promoter would be advantageous for several applications, such as expression of dominant negative RNAs or proteins, or for gene therapy. We investigated the possibility of increasing the transcriptional activity of the human GFAP promoter by inserting into it one or three additional copies of putative GFAP enhancer regions. The promoters enhanced with three additional copies gave 75-fold higher LacZ expression levels upon plasmid transfection into GFAP-expressing U251 cells than the parental gfa2 promoter. Surprisingly, in a transgenic mouse model, the enhanced promoters resulted in no or only very low expression of marker genes, probably caused by toxicity. When various cell lines were infected with replication-deficient adenoviral vectors, the enhanced promoters gave LacZ expression levels that were approximately 10-fold higher than those with the parental gfa2 promoter, while retaining specificity for GFAP-expressing cells. Injection of the adenoviral vectors carrying the enhanced promoters into nude mouse brain showed that LacZ expression was limited to GFAP-positive cells. We conclude that gfa2 enhanced promoters are useful for production of short-term, glia-specific, high expression levels of genes in an adenoviral context. Adenoviral vectors containing these enhanced promoters may be useful in glioma gene therapy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text