Quercetin Inhibits Glioblastoma Growth and Prolongs Survival Rate through Inhibiting Glycolytic Metabolism

Introduction: Quercetin has been reported to have antitumor activity of a wide range of cancers, including breast, lung, colon, prostate. Here, we investigated the protective role of quercetin in glioblastoma (GBM), which causes a higher risk of morbidity and mortality, and explored the antitumor effects of quercetin on GBM using the U87MG and T98G cells and GBM mouse models. Methods: Cell viability and colony formation assays were performed by CCK-8 and clone-formation assays. GBM xenograft mouse model was established to evaluate the tumor burden of mice treated with or without quercetin. To investigate spontaneous locomotor activity and survival rate of mice, orthotopic transplantation was performed through brain stereotaxic injection of U87 cells. Seahorse and Western blot were performed to examine the alteration of glycolytic metabolism GBM. Results: We found that quercetin administration inhibited GBM cell proliferation and promoted cell apoptosis in vitro. Quercetin suppressed GBM growth, restored spontaneous locomotor activity, and improved survival rate without toxicity to peripheral organs in vivo. Moreover, quercetin inhibited glycolytic metabolism in tumor tissue. Discussion/Conclusion: Mechanistically, quercetin inhibited proliferation and angiogenesis, promoted cancer cell apoptosis, and finally improved locomotor activity and survival by inhibiting the glycolytic metabolism in GBM tissues, suggesting that quercetin is a potential drug for the treatment of GBM.