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Astrocytic expression of transgene in the rat brain mediated by baculovirus vectors containing an astrocyte-specific promoter

Gene Therapy volume 13, pages 1447–1456 (2006)Cite this article

Abstract

Therapeutic gene expression in glial cells has been tested for the treatment of neurological diseases in animal models. Many of such studies used the promoter of the glial fibrillary acidic protein (GFAP) to restrict gene expression to astrocytes. We have investigated in the current study whether it is possible to improve the transcriptional activity of the cellular promoter, while maintaining its cell-type specificity. We constructed an expression cassette containing a hybrid cytomegalovirus (CMV) enhancer/GFAP promoter and placed it into baculovirus vectors, a type of viral vectors capable of transducing astrocytes. In another vector design, we used inverted terminal repeats (ITRs) from adeno-associated virus (AAV) to flank the expression cassette. The recombinant baculoviruses with the hybrid promoter improved gene expression levels over two orders of magnitude in glial cell lines and by 10-fold in the rat brain when compared to the baculoviruses with the GFAP promoter alone. The expression was further improved by ITR flanking, reaching levels higher than that mediated by the baculovirus vectors with the CMV immediate-early enhancer/promoter (CMV promoter). Using these recombinant baculoviruses, we observed extended in vivo transgene expression in the rat brain at 90 days postinjection, by which time the gene expression from baculovirus vectors with the GFAP or CMV promoter had already become undetectable. The astrocyte specificity of the GFAP promoter was preserved in the engineered expression cassette with the CMV enhancer and the AAV ITRs, as demonstrated by immunohistological analysis of brain samples and an axonal retrograde transport assay. Taken together, our findings suggest that these baculovirus vectors may serve as useful tools for astrocyte-specific gene expression in the brain.

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Acknowledgements

We thank Dr Jerome Boulaire and Dr Frank Alexis for their critical review of the manuscript and other lab members for helpful discussion and support. The work was supported by Institute of Bioengineering and Nanotechnology, the Agency for Science, Technology and Research (A*STAR) in Singapore and National University of Singapore.

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  1. Institute of Bioengineering and Nanotechnology, National University of Singapore, Singapore, Singapore

    C Y Wang & S Wang

  2. Department of Biological Sciences, National University of Singapore, Singapore, Singapore

    S Wang

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Correspondence to S Wang.

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Wang, C., Wang, S. Astrocytic expression of transgene in the rat brain mediated by baculovirus vectors containing an astrocyte-specific promoter. Gene Ther 13, 1447–1456 (2006). https://doi.org/10.1038/sj.gt.3302771

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