Abstract
High-throughput screens (HTS) of compound toxicity against cancer cells can identify thousands of potential new drug-leads. But only limited numbers of these compounds can progress to expensive and labor-intensive efficacy studies in mice, creating a ‘bottle neck’ in the drug development pipeline. Approaches that triage drug-leads for further study are greatly needed. Here we provide an intermediary platform between HTS and mice by adapting mouse models of pediatric brain tumors to grow as orthotopic xenografts in the brains of zebrafish. Freshly isolated mouse ependymoma, glioma and choroid plexus carcinoma cells expressing red fluorescence protein were conditioned to grow at 34 °C. Conditioned tumor cells were then transplanted orthotopically into the brains of zebrafish acclimatized to ambient temperatures of 34 °C. Live in vivo fluorescence imaging identified robust, quantifiable and reproducible brain tumor growth as well as spinal metastasis in zebrafish. All tumor xenografts in zebrafish retained the histological characteristics of the corresponding parent mouse tumor and efficiently recruited fish endothelial cells to form a tumor vasculature. Finally, by treating zebrafish harboring ERBB2-driven gliomas with an appropriate cytotoxic chemotherapy (5-fluorouracil) or tyrosine kinase inhibitor (erlotinib), we show that these models can effectively assess drug efficacy. Our data demonstrate, for the first time, that mouse brain tumors can grow orthotopically in fish and serve as a platform to study drug efficacy. As large cohorts of brain tumor-bearing zebrafish can be generated rapidly and inexpensively, these models may serve as a powerful tool to triage drug-leads from HTS for formal efficacy testing in mice.
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Acknowledgements
This work was supported by grants from the National Institutes of Health (R01CA129541, P01CA96832 and P30CA021765, RJG), the Collaborative Ependymoma Research Network (CERN) and by ALSAC. We are grateful to the staff of the Hartwell Center for Bioinformatics and Biotechnology, and Flow Cytometry & Cell Sorting Shared Resource at St Jude Children’s Research Hospital for technical assistance.
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Eden, C., Ju, B., Murugesan, M. et al. Orthotopic models of pediatric brain tumors in zebrafish. Oncogene 34, 1736–1742 (2015). https://doi.org/10.1038/onc.2014.107
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DOI: https://doi.org/10.1038/onc.2014.107
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