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- W2308226493 abstract "Herbal therapies are commonly used by patients with cancer, despite little understanding about their clinical and biological activity. We recently demonstrated that the herbal combination PC-SPES, which contains licorice root, had potent estrogenic activity in vitro, in animals, and in patients with prostate cancer. Licochalcone-A (LA) is one flavonoid extracted from licorice root with antiparasitic and anti-tumor activity, but the effect on the human estrogen receptor and mechanism of anti-tumor activity is unknown. Recent studies demonstrated that the mechanism of cytotoxic effect by some estrogens may involve modulation of the anti-apoptotic protein bcl-2. In the present study, we determined if LA had estrogenic activity, anti-tumor activity, and modulated the apoptotic protein bcl-2 in human cell lines derived from acute leukemia, breast cancer, and prostate cancer. A yeast growth-based assay under the control of the human estrogen receptor (hER) demonstrated that LA was a phytoestrogen. A cell viability assay demonstrated that LA had anti-tumor activity in all cell lines tested and enhanced the effect of paclitaxel and vinblastine chemotherapy. LA induced apoptosis in MCF-7 and HL-60 cell lines, as demonstrated by cleavage of PARP, the substrate of ICE-like proteases. Immunoblot analysis demonstrated that LA decreased the anti-apoptotic protein bcl-2 and altered the bcl-2/bax ratio in favor of apoptosis. In contrast, the parent compound chalcone or estradiol did not decrease bc1-2 expression. Therefore, these data demonstrate that LA is a phytoestrogen with anti-tumor activity and is capable of modulating bcl-2 protein expression. The modulation of bcl-2 may be dependent on specific structural differences between LA and the parent compound chalcone and independent of LA estrogenicity." @default.
- W2308226493 created "2016-06-24" @default.
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- W2308226493 date "2000-08-23" @default.
- W2308226493 modified "2023-10-15" @default.
- W2308226493 title "Modulation of bcl-2 and cytotoxicity by licochalcone-A, a novel estrogenic flavonoid." @default.
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