| Summary: | The hepatic metabolites of daidzein has been demonstrated to be more potent in chronic diseases than daidzein. However, the investigation of their roles in estrogen receptor (ER)-negative breast cancer is limited. Here, the hepatic metabolite of daidzein 6,7,4′-trihydroxyisoflavone inhibited cell proliferation, induced cell cycle arrest at G2/M phase, and regulated the expression of cyclin B, cyclin dependent kinase (CDK)-1 and CDK2 in MCF10DCIS.com ER-negative breast cancer cells. 6,7,4′-Trihydroxyisoflavone activated glycogen synthase kinase (GSK)-3β, and suppressed the nuclear translocation of β-catenin. Inhibition of GSK3β by lithium chloride reversed the effect of 6,7,4′-trihydroxyisoflavone on β-catenin localization, CDK1, CDK2 and cyclin B expression, and the proliferation of MCF10DCIS.com. In xenograft animal model, 6,7,4′-trihydroxyisoflavone inhibited tumor growth, and regulated GSK3β phosphorylation and β-catenin nuclear localization. These results indicate that 6,7,4′-trihydroxyisoflavone suppressed ER-negative breast cancer growth through regulating GSK3β/β-catenin signaling, and 6,7,4′-trihydroxyisoflavone may be a potent chemopreventive agent in regulating the ER-negative human mammary carcinogenesis.
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