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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Demethylation and epigenetic modification with 5-azacytidine reduces IDH1 mutant glioma growth in combination with temozolomide

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Yamashita, Alex Shimura [1, 2] ; Rosa, Marina da Costa [2] ; Borodovsky, Alexandra [2] ; Festuccia, William T. [1] ; Chan, Timothy [3] ; Riggins, Gregory J. [2]
Total Authors: 6
[1] Univ Sao Paulo, Dept Physiol & Biophys, Sao Paulo - Brazil
[2] Johns Hopkins Univ, Sch Med, Dept Neurosurg, Baltimore, MD 21205 - USA
[3] Mem Sloan Kettering Canc Ctr, Human Oncol & Pathogenesis Program, 1275 York Ave, New York, NY 10021 - USA
Total Affiliations: 3
Document type: Journal article
Source: NEURO-ONCOLOGY; v. 21, n. 2, p. 189-200, FEB 2019.
Web of Science Citations: 5

Background. Isocitrate deyhydrogenase (IDH) mutant glioma comprises the majority of grades 11-III gliomas and nearly all secondary glioblastomas. These progressive gliomas arise from mutations in IDH1 or IDH2 that pathologically produce D-2-hydroxyglutarate (2HG), which interferes with cell reactions using alpha ketoglutarate, leading to a hypermethylated genome and epigenetic dysregulation of gene expression initiating tumorigenesis. Methods. Human 1DH1 wild type (wt) and IDH1 R132H cell lines and patient-derived xenografts (PDXs) were used to evaluate the FDA-approved DNA demethylating agent 5-azacytidine (5-aza). Cell growth, protein and gene expression, chromatin immunoprecipitation, and nucleosome position assays were performed in 5-aza treated cells. To evaluate antitumor activity in vivo, 5-aza was administered alone and in combination with temozolomide (TMZ) in a PDX glioma model harboring IDH1 R132H mutation. Results. 5-Aza treatment has been found to reduce cell growth and increase expression of glial fibrillary acid protein (GFAP). Chromatin immunoprecipitation and nucleosome position assay showed that the mechanism of increased GFAP expression induction is associated with histone modification and nucleosome repositioning of the GFAP promoter, respectively. In vivo, 5-aza treatment extended survival in IDH1 R132H mutant but not in an IDH1 wt glioma model. Additionally, 5-aza enhances the therapeutic effect of the DNA damaging agent TMZ in both subcutaneous and orthotopic PDX models of 1DH1 R132H mutant glioma. Conclusion. 5-Aza provided a survival benefit as a single agent but worked best in combination with TMZ in 2 different IDH1 R132H mutant glioma models. (AU)

FAPESP's process: 15/05828-2 - Mutação IDH1R132H em glioblastoma como alvo terapêutico
Grantee:Alex Shimura Yamashita
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor