Preclinical assessment of MEK1/2 inhibitors for neurofibromatosis type 2-associated schwannomas reveals differences in efficacy and drug resistance development.

Autor:	Fuse MA; Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida (UCF), Orlando, Florida, USA., Dinh CT; Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida, USA., Vitte J; Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA and Jonsson Comprehensive Cancer Center, University of California at Los Angeles (UCLA), Los Angeles, California, USA., Kirkpatrick J; Leibniz Institute on Aging, Fritz Lipmann Institute, Jena, Germany., Mindos T; Leibniz Institute on Aging, Fritz Lipmann Institute, Jena, Germany., Plati SK; Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida (UCF), Orlando, Florida, USA., Young JI; Department of Human Genetics, University of Miami Miller School of Medicine, Miami, Florida, USA., Huang J; Center for Childhood Cancer and Blood Diseases, Nationwide Children's Hospital.; Department of Pediatrics, The Ohio State University, Columbus, Ohio, USA., Carlstedt A; Leibniz Institute on Aging, Fritz Lipmann Institute, Jena, Germany., Franco MC; Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida (UCF), Orlando, Florida, USA., Brnjos K; Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida (UCF), Orlando, Florida, USA., Nagamoto J; Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida (UCF), Orlando, Florida, USA., Petrilli AM; Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida (UCF), Orlando, Florida, USA., Copik AJ; Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida (UCF), Orlando, Florida, USA., Soulakova JN; Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida (UCF), Orlando, Florida, USA., Bracho O; Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida, USA., Yan D; Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida, USA., Mittal R; Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida, USA., Shen R; Department of Pathology, The Ohio State University, Columbus, Ohio, USA., Telischi FF; Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida, USA., Morrison H; Leibniz Institute on Aging, Fritz Lipmann Institute, Jena, Germany., Giovannini M; Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA and Jonsson Comprehensive Cancer Center, University of California at Los Angeles (UCLA), Los Angeles, California, USA., Liu XZ; Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida, USA.; Department of Human Genetics, University of Miami Miller School of Medicine, Miami, Florida, USA., Chang LS; Center for Childhood Cancer and Blood Diseases, Nationwide Children's Hospital.; Department of Pediatrics, The Ohio State University, Columbus, Ohio, USA., Fernandez-Valle C; Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida (UCF), Orlando, Florida, USA.
Jazyk:	angličtina
Zdroj:	Neuro-oncology [Neuro Oncol] 2019 Mar 18; Vol. 21 (4), pp. 486-497.
DOI:	10.1093/neuonc/noz002
Abstrakt:	Background: Neurofibromatosis type 2 (NF2) is a genetic tumor-predisposition disorder caused by NF2/merlin tumor suppressor gene inactivation. The hallmark of NF2 is formation of bilateral vestibular schwannomas (VS). Because merlin modulates activity of the Ras/Raf/mitogen-activated protein kinase kinase (MEK)/extracellular signal-regulated kinase (ERK) pathway, we investigated repurposing drugs targeting MEK1 and/or MEK2 as a treatment for NF2-associated schwannomas. Methods: Mouse and human merlin-deficient Schwann cell lines (MD-MSC/HSC) were screened against 6 MEK1/2 inhibitors. Efficacious drugs were tested in orthotopic allograft and NF2 transgenic mouse models. Pathway and proteome analyses were conducted. Drug efficacy was examined in primary human VS cells with NF2 mutations and correlated with DNA methylation patterns. Results: Trametinib, PD0325901, and cobimetinib were most effective in reducing MD-MSC/HSC viability. Each decreased phosphorylated pERK1/2 and cyclin D1, increased p27, and induced caspase-3 cleavage in MD-MSCs. Proteomic analysis confirmed cell cycle arrest and activation of pro-apoptotic pathways in trametinib-treated MD-MSCs. The 3 inhibitors slowed allograft growth; however, decreased pERK1/2, cyclin D1, and Ki-67 levels were observed only in PD0325901 and cobimetinib-treated grafts. Tumor burden and average tumor size were reduced in trametinib-treated NF2 transgenic mice; however, tumors did not exhibit reduced pERK1/2 levels. Trametinib and PD0325901 modestly reduced viability of several primary human VS cell cultures with NF2 mutations. DNA methylation analysis of PD0325901-resistant versus -susceptible VS identified genes that could contribute to drug resistance. Conclusion: MEK inhibitors exhibited differences in antitumor efficacy resistance in schwannoma models with possible emergence of trametinib resistance. The results support further investigation of MEK inhibitors in combination with other targeted drugs for NF2 schwannomas. (© The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Neuro-Oncology. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)
Databáze:	MEDLINE
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