Abstract
Purpose/introduction
Glioblastoma (GB) remains incurable despite aggressive chemotherapy, radiotherapy, and surgical interventions; immunotherapies remain experimental in clinical practice. Relevant preclinical models that can accurately predict tumor response to therapy are equally challenging. This study aimed to validate the effect of the naturally occurring agent diallyl trisulfide (DATS) in human GB in relevant pre-clinical models.
Methods
Ex vivo slice culture, in vivo cell line derived orthotopic xenograft and patient-derived orthotopic xenograft (PDX) animal models of GB were utilized to assess efficacy of treatment with DATS.
Results
Our results showed 72-h treatments of 25 µM DATS induced cell death in ex vivo human GB slice culture. We treated U87MG orthotopic xenograft models (U87MGOX) and patient-derived orthotopic xenograft models (PDX) with daily intraperitoneal injections of DATS for 14 days. Magnetic resonance (MR) imaging of mice treated with DATS (10 mg/kg) demonstrated reduced tumor size at 5 weeks when compared with saline-treated U87MGOX and PDX controls. Hematoxylin (H&E) staining demonstrated dose-dependent reduction in gross tumor volume with decreased proliferation and decreased angiogenesis. Western blotting showed that DATS was associated with increases in histone acetylation (Ac-Histone H3/H4) and activated caspase-3 in this novel preclinical model. Histological assessment and enzyme assays showed that even the highest dose of DATS did not negatively impact hepatic function.
Conclusions
DATS may be an effective and well-tolerated therapeutic agent in preventing tumor progression and inducing apoptosis in human GB.
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Funding
Completion of this project was made possible in part by the Jerry Zucker Fund for Brain Tumor Research and Funds from the Department of Neurosurgery. This work was conducted in a facility constructed with support from the National Institutes of Health, Grant Number C06 RR015455.
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All authors declared that they have no conflict of interest.
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All procedures involving animals conformed to the Institutional Animal Care and Use Committee’s and the National Institute of Health’s guidelines. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the non therapeutic human study.
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Das, A., Henderson, F., Lowe, S. et al. Single agent efficacy of the HDAC inhibitor DATS in preclinical models of glioblastoma. Cancer Chemother Pharmacol 82, 945–952 (2018). https://doi.org/10.1007/s00280-018-3684-7
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DOI: https://doi.org/10.1007/s00280-018-3684-7