Abstract
Herpes simplex virus thymidine kinase (HSVTK)/ganciclovir (GCV) suicide gene therapy has a long history of treating malignant gliomas. Recently, stem cells from human exfoliated deciduous teeth (SHED), which are collected from deciduous teeth and have excellent harvestability, ethical aspects, and self-renewal, have been attracting attention mainly in the field of gene therapy. In the present study, we assessed SHED as a novel cellular vehicle for suicide gene therapy in malignant gliomas, as we have previously demonstrated with various cell types. SHED was transduced with the HSVTK gene (SHEDTK). In vitro experiments showed a significant bystander effect between SHEDTK and glioma cell lines in coculture. Furthermore, apoptotic changes caused by caspase 3/7 activation were simultaneously observed in SHEDTK and glioma cells. Mice implanted with a mixture of U87 and SHEDTK and treated with intraperitoneal GCV survived for longer than 100 days. Additionally, tumors in treatment model mice were significantly reduced in size during the treatment period. SHEDTK implanted at the contralateral hemisphere migrated toward the tumor crossing the corpus callosum. These results suggested that SHEDTK-based suicide gene therapy has potent tumor tropism and a bystander-killing effect, potentially offering a new promising therapeutic modality for malignant gliomas.
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Data availability
The datasets used and analyzed during the current study are available from the last corresponding author on reasonable request.
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Acknowledgements
We thank all members of the laboratory for their discussions and suggestions. Part of this work was performed at the Advanced Research Facilities & Services (ARFS), Hamamatsu University School of Medicine. We also thank Mitchell Arico from Edanz (https://jp.edanz.com/ac) for editing a draft of this manuscript.
Funding
This work was supported by Hamamatsu University School of Medicine (HUSM) Grant-in-Aid. This study was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Numbers JP20K09325 (KK), JP19K09523 (TS).
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Conception and design: MH, HN, and KK. Development of methodology: MH, MI, MI, SA, SK, TS, HN, and KK. Acquisition of data (provided animals, acquired and managed patients, provided facilities, etc.): MH. Analysis and interpretation of data (e.g., statistical analysis, biostatistics, computational analysis): MH, TO, SK, HN, and KK. Writing, review, and/or revision of the manuscript: MH, YM, YO, YY, HN, and KK. Administrative, technical, or material support (i.e., reporting or organizing data, constructing databases): MH, MI, MI, TS, HN, and KK. Study supervision: KK.
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Kidswell Bio Corporation (Tokyo, Japan) generously provided SHED as experimental material. The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.
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Horikawa, M., Koizumi, S., Oishi, T. et al. Potent bystander effect and tumor tropism in suicide gene therapy using stem cells from human exfoliated deciduous teeth. Cancer Gene Ther 30, 85–95 (2023). https://doi.org/10.1038/s41417-022-00527-5
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DOI: https://doi.org/10.1038/s41417-022-00527-5