Abstract
Malignant gliomas (MGs) are the most common malignant primary brain tumors with a short life estimate accompanied by a marked reduction in the quality of life. Herpes Simplex virus-1 thymidine kinase ganciclovir (HSV-TK/GCV) system is the best characterized enzyme prodrug therapy in use. However, lipophobicity of GCV and low enzymatic activity of HSV-TK reduce the treatment efficacy. Tomato TK (ToTK) has shown high activity in combination with its specific substrate azidothymidine (AZT). The aim of this study was to evaluate whether ToTK/AZT could be used as an alternative to HSV-TK/GCV therapy. Both treatments demonstrated cytotoxicity in human MG cells in vitro. In vivo, both treatments decreased tumor growth and tumors were smaller in comparison with controls in mouse orthotopic MG model. Survival of ToTK/AZT-treated mice was significantly increased compared with control mice (*P<0.05) but not as compared with HSV-TK/GCV-treated mice. No significant differences were observed in clinical chemistry safety analyses. We conclude that both treatments showed a beneficial treatment response in comparison to controls on tumor growth and ToTK/AZT also on survival. There were no significant differences between these treatments. Therefore ToTK/AZT could be considered as an alternative treatment option for MG because of its favorable therapeutic characteristics.
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Acknowledgements
Authors thank Sari Järveläinen, Tiina Koponen, Riina Kylätie, Joonas Malinen, Anneli Miettinen and Mervi Nieminen for their skillful technical assistance. Dr Timo Liimatainen (A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland) is acknowledged for his assistance in MRI issues. The authors thank Professor Ari Hinkkanen’s research group (A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland) for providing GL261 and U87MG-Fluc cells and Ark Therapeutics Ltd for providing Ad.HSV-TK virus for the study. Support for the work: This study was supported by grants from ERC (#250050 Future Genes), Finnish Academy (CoE #141069), Sigrid Juselius Foundation and TEKES (#70043/10).
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Stedt, H., Samaranayake, H., Kurkipuro, J. et al. Tomato thymidine kinase-based suicide gene therapy for malignant glioma—an alternative for Herpes Simplex virus-1 thymidine kinase. Cancer Gene Ther 22, 130–137 (2015). https://doi.org/10.1038/cgt.2014.76
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DOI: https://doi.org/10.1038/cgt.2014.76
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