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首页> 外文期刊>Apoptosis >Withaferin A induces apoptosis in human melanoma cells through generation of reactive oxygen species and down-regulation of Bcl-2
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Withaferin A induces apoptosis in human melanoma cells through generation of reactive oxygen species and down-regulation of Bcl-2

机译:Withaferin A通过产生活性氧和下调Bcl-2诱导人黑素瘤细胞凋亡

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摘要

A high resistance and heterogeneous response to conventional anti-cancer chemotherapies characterize malignant cutaneous melanoma, the most aggressive and deadly form of skin cancer. Withaferin A (WFA), a withanolide derived from the medicinal plant Withania somnifera, has been reported for its anti-tumorigenic activity against various cancer cells. For the first time, we examined the death-inducing potential of WFA against a panel of four different human melanoma cells and investigated the cellular mechanisms involved. WFA induces apoptotic cell death with various IC50 ranging from 1.8 to 6.1 μM. The susceptibility of cells toward WFA-induced apoptosis correlated with low Bcl-2/Bax and Bcl-2/Bim ratios. In all cell lines, the apoptotic process triggered by WFA involves the mitochondrial pathway and was associated with Bcl-2 down regulation, Bax mitochondrial translocation, cytochrome c release into the cytosol, transmembrane potential (ΔΨm) dissipation, caspase 9 and caspase 3 activation and DNA fragmentation. WFA cytotoxicity requires early reactive oxygen species (ROS) production and glutathione depletion, the inhibition of ROS increase by the antioxidant N-acetylcysteine resulting in complete suppression of mitochondrial and nuclear events. Altogether, these results support the therapeutic potential of WFA against human melanoma.
机译:对常规抗癌化学疗法的高耐药性和异质性反应是恶性皮肤黑素瘤的特征,恶性皮肤黑素瘤是皮肤癌的最具侵害性和致命性的形式。据报道,Withaferin A(WFA)是源自药用植物Withania somnifera的withanolide,具有针对多种癌细胞的抗肿瘤活性。首次,我们检查了WFA对一组四个不同的人类黑素瘤细胞的诱导死亡的潜力,并研究了涉及的细胞机制。 WFA诱导凋亡细胞死亡,IC 50 的变化范围为1.8至6.1μM。细胞对WFA诱导的细胞凋亡的敏感性与低的Bcl-2 / Bax和Bcl-2 / Bim比有关。在所有细胞系中,由WFA触发的凋亡过程均涉及线粒体途径,并与Bcl-2下调,Bax线粒体易位,细胞色素c释放到胞质溶胶,跨膜电位(ΔΨm)消散,胱天蛋白酶9和胱天蛋白酶3活化有关。 DNA片段化。 WFA的细胞毒性需要早期产生活性氧(ROS)和减少谷胱甘肽,抗氧化剂N-乙酰半胱氨酸对ROS的抑制作用会导致线粒体和核事件的完全抑制。总而言之,这些结果支持了WFA对人黑素瘤的治疗潜力。

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