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Luteolin suppresses bladder cancer growth via regulation of mechanistic target of rapamycin pathway.

Cancer Sci. 2020 Apr;111(4):1165-1179. doi:10.1111/cas.14334. Epub 2020 Feb 24
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摘要


Luteolin is a natural flavonoid with strong anti-oxidative properties that is reported to have an anti-cancer effect in several malignancies other than bladder cancer. In this study, we describe the effect of luteolin on a human bladder cancer cell line, T24, in the context of the regulation of p21, thioredoxin-1 (TRX1) and the mechanistic target of rapamycin (mTOR) pathway. Luteolin inhibited cell survival and induced G2/M cell-cycle arrest, p21 upregulation and downregulation of phospho(p)-S6, which is downstream of mTOR signaling. Luteolin also upregulated TRX1 and reduced intracellular reactive oxygen species production. In a subcutaneous xenograft mouse model using the rat bladder cancer cell line, BC31, tumor volumes were significantly decreased in mice orally administered luteolin compared to control. Immunohistochemical analysis revealed that increased p21 and decreased p-S6 expression were induced in the luteolin treatment group. Moreover, in another in vivo N-butyl-N-(4-hydroxybutyl) nitrosamine (BBN)-induced rat bladder cancer model, the oral administration of luteolin led to a trend of decreased bladder tumor dimension and significantly decreased the Ki67-labeling index and p-S6 expression. Furthermore, the major findings on the metabolism of luteolin suggest that both plasma and urine luteolin-3'-O-glucuronide concentrations are strongly associated with the inhibition of cell proliferation and mTOR signaling. Moreover, a significant decrease in the squamous differentiation of bladder cancer is attributed to plasma luteolin-3'-glucuronide concentration. In conclusion, luteolin, and in particular its metabolized product, may represent another natural product-derived therapeutic agent that acts against bladder cancer by upregulating p21 and inhibiting mTOR signaling.

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