Induction of G2M Arrest by Flavokawain A, a Kava Chalcone, Increases the Responsiveness of HER2-Overexpressing Breast Cancer Cells to Herceptin.

Induction of G2M Arrest by Flavokawain A, a Kava Chalcone, Increases the Responsiveness of HER2-Overexpressing Breast Cancer Cells to Herceptin.
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DOI:
10.3390/molecules22030462
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发表时间:
2017-03-14
期刊:
Molecules (Basel, Switzerland)
影响因子:
--
通讯作者:
Zi X
Zi X
中科院分区:
其他
文献类型:
--
作者:
Jandial DD;Krill LS;Chen L;Wu C;Ke Y;Xie J;Hoang BH;Zi X

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HER2/neu 阳性乳腺肿瘤预示着高死亡率,占乳腺癌的 25%–30%。我们已经证明,与 HER2 表达较少的细胞系(即 MCF7 和 MDA-MB-468)相比,Flavokawain A (FKA) 优先降低 HER2 过表达乳腺癌细胞系(即 SKBR3 和 MCF7/HER2)的活力。对乳腺癌细胞系有细胞毒性浓度的 FKA 对非恶性乳腺上皮 MCF10A 细胞的生长影响也很小。 FKA 通过抑制 Cdc2 和 Cdc25C 磷酸化以及下调 Myt1 和 Wee1 表达导致 Cdc2 激酶活性增加,诱导 HER2 过表达乳腺癌细胞系的细胞周期进程中的 G2M 停滞。此外,FKA 通过增加 Bim 和 BAX 的蛋白表达并减少 Bcl2、BclX/L、XIAP 和 survivin 的表达来诱导 SKBR3 细胞凋亡。 FKA 还下调 HER-2 的蛋白表达并抑制 AKT 磷酸化。赫赛汀联合 FKA 治疗通过下调 Myt1、Wee1、Skp2、survivin 和 XIAP 增强对 HER-2 过表达乳腺癌细胞系的生长抑制作用。我们的结果表明,FKA 是一种有前景的新型细胞凋亡诱导剂和 G2 阻断剂,与赫赛汀联合使用,可增强 HER2 过表达乳腺癌的治疗效果。
HER2/neu positive breast tumors predict a high mortality and comprise 25%–30% of breast cancer. We have shown that Flavokawain A (FKA) preferentially reduces the viabilities of HER2-overexpressing breast cancer cell lines (i.e., SKBR3 and MCF7/HER2) versus those with less HER2 expression (i.e., MCF7 and MDA-MB-468). FKA at cytotoxic concentrations to breast cancer cell lines also has a minimal effect on the growth of non-malignant breast epithelial MCF10A cells. FKA induces G2M arrest in cell cycle progression of HER2-overexpressing breast cancer cell lines through inhibition of Cdc2 and Cdc25C phosphorylation and downregulation of expression of Myt1 and Wee1 leading to increased Cdc2 kinase activities. In addition, FKA induces apoptosis in SKBR3 cells by increasing the protein expression of Bim and BAX and decreasing expression of Bcl2, BclX/L, XIAP, and survivin. FKA also downregulates the protein expression of HER-2 and inhibits AKT phosphorylation. Herceptin plus FKA treatment leads to an enhanced growth inhibitory effect on HER-2 overexpressing breast cancer cell lines through downregulation of Myt1, Wee1, Skp2, survivin, and XIAP. Our results suggest FKA as a promising and novel apoptosis inducer and G2 blocking agent that, in combination with Herceptin, enhances for the treatment of HER2-overexpressing breast cancer.
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