Abstract
Glioblastoma multiforme (GBM), an aggressive primary brain tumor, is radioresistant and recurs despite aggressive surgery, chemotherapy, and radiotherapy. Curcumin as a potential radiosensitizer has received extensive attention in cancer treatment. To explore an effectiveness of this radiosensitizer for GBM treatment, we evaluated the radiosensitizing effect of curcumin and investigated its potential molecular mechanisms in the human glioma cell line U87. The cytotoxic effects of curcumin on U87 cells were evaluated using the Cell Counting Kit-8 assay, and the radiosensitivity of U87 cells treated with curcumin was accessed by colony information assay. The effects of curcumin on cell proliferation and cell cycle regulation were determined using the 5-ethynyl-2-deoxyuridine incorporation assay and flow cytometry, respectively. Western blotting was applied to determine the effects of curcumin on protein expression of dual-specificity phosphatase-2 (DUSP-2), extracellular signal-regulated kinase (ERK), and c-Jun N-terminal kinase (JNK) as well as phosphorylated ERK and JNK. Curcumin significantly inhibited the proliferation of U87 cells in a dose-and time-dependent manner. Curcumin treatment at the concentrations of 5 µM and 10 M ...Continue Reading
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