Abstract
Recombinant adenoviruses, carrying herpes simplex virus thymidine kinase (HSVtk) genes, were developed to evaluate the possibility of tissue-specific gene therapy for thyroid carcinomas. The HSVtk gene was driven by a minimal thyroglobulin (TG) promoter (AdTGtk) and a tandemly repeated minimal TG promoter (Ad2×TGtk) to obtain thyroid-specific cell killing ability. The transduction of HSVtk genes by infection with Ad2×TGtk followed by ganciclovir (GCV) treatment showed more powerful cytotoxicity for TG-producing FRTL5 cells, a rat normal thyroid cell line, and FTC-133 cells, a human follicular thyroid carcinoma cell line, than when infected with AdTGtk in vitro. The cell killing ability of Ad2×TGtk was 10- to 30-fold higher than that of AdTGtk and similar to that of AdCMVtk, which carries HSVtk under the control of CMV promoter. Whereas after treatment with adenovirus/GCV to non–TG-producing cell lines (undifferentiated thyroid carcinoma cell lines and carcinoma cell lines from other tissues), Ad2×TGtk and AdTGtk needed more than 100-fold concentrated GCV to reach IC50 compared to AdCMVtk. We confirmed the enhanced efficacy of Ad2×TGtk for tissue-specific cytotoxicity in vivo. After adenovirus/GCV treatment for FTC-133 tumor-bearing nude mice, Ad2×TGtk enhanced tumor growth inhibition and survival rates compared to AdTGtk. Tumor growth inhibition and survival rates by Ad2×TGtk were similar to that by AdCMVtk. Moreover, any toxic effect for rat normal tissues was not revealed after intravenous injections with Ad2×TGtk and intraperitoneal administrations with GCV in vivo, whereas severe liver damages were observed after treatment with AdCMVtk/GCV. These data indicate a beneficial effect of Ad2×TGtk for tissue-specific gene therapy for TG-producing thyroid carcinomas without toxicity for normal tissues.
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Acknowledgements
We are grateful to RD Lauro for providing the pTGCAT vector, SLC Woo for the pBS-tk plasmid, and S Refetoff for the pJM17 plasmid and AdTKluc. We also thank F Hoffmann-La Roche for providing GCV.
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Takeda, T., Yamazaki, M., Minemura, K. et al. A tandemly repeated thyroglobulin core promoter has potential to enhance efficacy for tissue-specific gene therapy for thyroid carcinomas. Cancer Gene Ther 9, 864–874 (2002). https://doi.org/10.1038/sj.cgt.7700511
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DOI: https://doi.org/10.1038/sj.cgt.7700511