Abstract
Honokiol is a biphenolic component of the bark of Magnolia, and has been shown to exert several activities, including anti-depressant, anti-emetic, anti-oxidative, anti-thrombotic, anti-angiogenesis, anti-anxiolytic, anti-inflammatory and anti-tumor effects. The anti-tumor activities of honokiol and its synergistic effect with 5-fluorouracil (5-FU) in human urothelial cell carcinoma (UCC) cells were investigated. Honokiol significantly suppressed the proliferation of UCC cells in a dose- and time-dependent manner. Moreover, honokiol inhibited the tumorigenesis of UCC cells in vitro. In addition, honokiol induced cell cycle arrest at G0/G1 phase and caused apoptosis of UCC cells through the intrinsic pathway. Importantly, we demonstrated that honokiol potentiated the cytotoxic effect of 5-FU, and displayed a synergistic effect with 5-FU in UCC cells. Honokiol causes growth inhibition, tumorigenesis suppression, cell cycle arrest, apoptosis, and importantly has a synergistic effect with 5-FU in human UCC cells. Therefore, this agent displays a therapeutic potential for treating human UCC.
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