Abstract
The human NCX gene, a homologue of the murine neural crest homeobox ( Ncx/Hox11L.1 ) gene whose expression is restricted to a subset of neural crest-derived tissues, was expressed in human neuroblastoma cells but not in other tumors or fibroblasts. A 4.5-kb genomic fragment in the 5′-flanking region of the NCX gene efficiently transcribed the fused luciferase reporter gene in human neuroblastoma cells but not in non-neuroblastoma cells. Sequential deletion of this regulatory region from the 5′ side demonstrated that a 1.7-kb fragment upstream from the start codon retained the preferential promoter activity in neuroblastoma cells. The transcriptional activation by the NCX promoter was stronger than that by the SV40 T antigen promoter in human neuroblastoma cells. Transfection of neuroblastoma cells with the NCX promoter–linked herpes simplex virus–thymidine kinase ( HSV-TK ) gene increased their sensitivity to ganciclovir. The regulatory region of the NCX gene is thus useful for neuroblastoma-specific suicide gene therapy. Cancer Gene Therapy (2001) 8, 997–1002
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Acknowledgements
This work was supported by a grant-in-aid for scientific research from the Japan Society for the Promotion of Science, a grant-in-aid for scientific research on priority areas from the Minister of Education, Culture, Sports, Science and Technology of Japan, and the Hamaguchi foundation for the advancement of biochemistry. R. Bahar is supported by the STA fellowship from the Science and Technology Agency of Japan. We thank F. Hoffman-La Roche (Basel, Switzerland) for their generous gift of GCV.
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Narita, M., Bahar, R., Hatano, M. et al. Tissue-specific expression of a suicide gene for selective killing of neuroblastoma cells using a promoter region of the NCX gene. Cancer Gene Ther 8, 997–1002 (2001). https://doi.org/10.1038/sj.cgt.7700408
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DOI: https://doi.org/10.1038/sj.cgt.7700408
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