Abstract
Purpose
Inhalation of perillyl alcohol (POH) recently emerged as an investigational promising antiglioma strategy. However, little attention has been paid to its therapeutic potential for other brain tumors, especially in the pediatric setting.
Methods
The effects of POH were explored in medulloblastoma cell models belonging to the SHH variant with activation of RAS (ONS-76) or with TP53 mutations (DAOY and UW402), by means of proliferation and invasion assays. Interactions with methotrexate, thiotepa, or ionizing radiation were also assessed. Mice bearing subcutaneous tumors were treated with intraperitoneal injections. Alternatively, animals with intracranial tumors were exposed to intranasal POH alone or combined with radiation. Tumor growth was measured by bioluminescence. Analyses of cytotoxicity to the nasal cavity were also performed, and the presence of POH in the brain, lungs, and plasma was surveyed through chromatography/mass spectrometry.
Results
POH decreased cell proliferation and colony formation, with conspicuous death, though the invasive capacity was only affected in the NRAS-mutated cell line. Median-drug effect analysis displayed synergistic combinations with methotrexate. Otherwise, POH showed to be a reasonable radiosensitizer. In vivo, intraperitoneal injection significantly decreased tumor volume. However, its inhalation did not affect orthotopic tumors, neither alone or followed by cranial irradiation. Nasal cavity epithelium showed unimportant alterations, though, no traces of POH or its metabolites were detected in tissue samples.
Conclusion
POH presents robust in vitro antimedulloblastoma effects and sensitizes cell lines to other conventional therapeutics, reducing tumor volume when administered intraperitoneally. Nevertheless, further improvement of delivery devices and/or drug formulations are needed to better characterize its effectiveness through inhalation.
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Acknowledgments
The authors would like to thank Ieda Regina dos Santos and Cleide Lucia Araujo Silva for their assistance with the in vivo model, and Elderes de Paula, who performed the irradiation of animals. We also thank Adriana de Andrade Batista Murashima and Marina Zilio Fantucci for technical support.
Funding
This study was supported by FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo) Proc. N° 2013/23881-2 and 2016/08125-5.
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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed were in accordance with the ethical standards of the institutional Committee on Ethics in the Use of Animals (CEUA) from the University of São Paulo Ribeirão Preto Campus (Protocol 14.1.541.53.8).
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Supplementary figure 1
Chromatograms with retention time of standard POH samples and spectrometer with fragmentation and mass of this compound. A) POH at a concentration of 500μg/ml; B) POH at a concentration of 50μg/ml. (PNG 75 kb)
Supplementary figure 2
Representative chromatograms of brain, lung and plasma samples from control and POH-treated mice. No POH could be detected in any of the samples. A) Control group without receiving any treatment B) Group treated with 84μg POH collected after 15 min; C) Samples from the group treated with a dose of 84 μg POH, collected after 2 hours. (PNG 56 kb)
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Silva, M., de Sousa, G.R., Simões, S.C. et al. Perillyl alcohol for pediatric TP53- and RAS-mutated SHH-medulloblastoma: an in vitro and in vivo translational pre-clinical study. Childs Nerv Syst 37, 2163–2175 (2021). https://doi.org/10.1007/s00381-021-05115-w
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DOI: https://doi.org/10.1007/s00381-021-05115-w