Abstract
Purpose
The purpose was to re-evaluate in cell culture models the therapeutic usefulness of some discussed chemotherapies or targeted therapies for meningiomas with a special emphasis on the role of the neurofibromatosis type 2 (NF2) tumor suppressor, which had been neglected so far. In addition, the study intended to evaluate a potential benefit from a treatment with drugs which are well established in other fields of medicine and have been linked recently with tumor disease by epidemiological studies.
Methods
Meningioma cell lines corresponding to various subtypes and pairs of syngenic meningioma cell lines with or without shRNA-induced NF2 knockdown were analyzed for their dose-dependent response to the drugs in microtiter tetrazolium assays, BrdU assays and for selected cases in ELISAs measuring nucleosome liberation to specifically separate cell death from pure inhibition of cell proliferation.
Results
We confirmed a moderate efficacy of hydroxyurea (HU) in clinically relevant concentrations. Under appropriate dosing, we neither detected major responses to the alkylating compound temozolomide nor to various drugs targeting membrane receptors or enzymes (tamoxifen, erlotinib, mifepristone, losartan, metformin and verapamil). Only concentrations far beyond achievable serum levels generated significant effects with the exception of losartan, which showed no effects at all. Chemosensitivity varied markedly among meningioma cell lines. Importantly, cells with NF2 loss exhibited a significantly higher induction of cell death by HU.
Conclusions
Alternative chemotherapeutic or targeted approaches besides HU have still to be evaluated in further studies, and the role of NF2 must be taken into account.
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Acknowledgments
We thank Emmanuel Antwi-Adjei and Maulana Ikhsan Zain for their help with the experiments. The meningioma research of the group is supported by the Wilhelm-Sander-Stiftung (2010.017.2) and the Deutsche Kinderkrebsstiftung (DKS 2013.04). We are grateful to Helen Morrison for providing reagents.
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Wilisch-Neumann, A., Pachow, D., Wallesch, M. et al. Re-evaluation of cytostatic therapies for meningiomas in vitro. J Cancer Res Clin Oncol 140, 1343–1352 (2014). https://doi.org/10.1007/s00432-014-1683-6
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DOI: https://doi.org/10.1007/s00432-014-1683-6