1. Resveratrol restores sensitivity of glioma cells to temozolamide through inhibiting the activation of Wnt signaling pathway.
- Author
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Yang HC, Wang JY, Bu XY, Yang B, Wang BQ, Hu S, Yan ZY, Gao YS, Han SY, and Qu MQ
- Subjects
- Animals, Apoptosis drug effects, Brain Neoplasms metabolism, Cell Line, Cell Line, Tumor, Cell Proliferation drug effects, Cell Survival drug effects, Down-Regulation drug effects, Drug Resistance, Neoplasm drug effects, Gene Expression Regulation, Neoplastic drug effects, Glioma metabolism, Glycogen Synthase Kinase 3 beta metabolism, Humans, Mice, Mice, Nude, O(6)-Methylguanine-DNA Methyltransferase metabolism, Brain Neoplasms drug therapy, Glioma drug therapy, Resveratrol pharmacology, Temozolomide pharmacology, Wnt Signaling Pathway drug effects
- Abstract
Malignant gliomas are aggressive primary neoplasms that originate in the glial cells of the brain or the spine with notable resistance to standard treatment options. We carried out the study with the aim to shed light on the sensitization of resveratrol to temozolomide (TMZ) against glioma through the Wnt signaling pathway. Initially, glioma cell lines with strong resistance to TMZ were selected by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Then, the glioma cells were subjected to resveratrol, TMZ, Wnt signaling pathway inhibitors, and activators. Cell survival rate and inhibitory concentration at half maximum value were detected by MTT, apoptosis by flow cytometry, and terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling staining, in vitro proliferation by hanging drop method and β-catenin translocation into nuclei by TOP/FOP-FLASH assay. The expressions of the Wnt signaling pathway-related and apoptosis-related factors were determined by western blot analysis. Nude mice with glioma xenograft were established to detect tumorigenic ability. Glioma cell lines T98G and U138 which were highly resistant to TMZ were selected for subsequent experiments. Resveratrol increased the efficacy of TMZ by restraining cell proliferation, tumor growth, and promoting cell apoptosis in glioma cells. Resveratrol inhibited Wnt2 and β-catenin expressions yet elevated GSK-3β expression. Moreover, the Wnt signaling pathway participates in the sensitivity enhancing of resveratrol to TMZ via regulating O
6 -methylguanine-DNA methyltransferase (MGMT) expression. Resveratrol sensitized TMZ-induced glioma cell apoptosis by repressing the activation of the Wnt signaling pathway and downregulating MGMT expression, which may confer new thoughts to the chemotherapy of glioma., (© 2018 Wiley Periodicals, Inc.)- Published
- 2019
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