萝卜硫素通过活性氧抑制甲状腺癌细胞的增殖、迁移及侵袭
首发时间:2015-06-04
摘要:萝卜硫素(Sulforaphane,SFN)是主要的异硫氰酸盐之一,来源于十字花科植物。已有很多研究已证实,萝卜硫素具有强有力的抗癌作用。然而,在甲状腺癌中,SFN的抗癌作用仍未知。目的:研究SFN对甲状腺癌的抗癌机制,为甲状腺癌的治疗提供新治疗靶点。实验设计:体外实验 分别选择不同遗传背景的甲状腺癌细胞系,检测SFN对甲状腺癌细胞系增殖、凋亡、周期及迁移、侵袭等行为影响; 体内实验 构建移植瘤裸鼠模型,再次验证SFN的抗癌作用及安全性。结果:SFN通过活性氧,抑制甲状腺癌细胞增殖,诱导甲状腺癌细胞凋亡及周期阻滞,并引起线粒体膜电位丧失,激活caspase-3及caspase-9。另外,SFN通过抑制上皮-间质转化,抑制甲状腺癌细胞迁移及侵袭,上调E-Cadherin,下调Slug、Vimentin及MMP-2,-9。并且激活p-Akt、p-P38及p-Erk等信号通路。在移植瘤裸鼠中,SFN抑制肿瘤的生长,并且不影响裸鼠的肝功能。结论:我们首次证明,SFN对甲状腺癌是一个有效的抗癌药物。
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Sulforaphane inhibits thyroid cancer cell growth and invasiveness through the reactive oxygen species-dependent pathway
Abstract:Sulforaphane (SFN), a natural compound derived from broccoli/broccoli sprouts, has been demonstrated to be used as an antitumor agent in different types of cancers. However, its antitumor effect in thyroid cancer remains largely unknown. The aim of the study was to investigate the therapeutic potential of SFN for thyroid cancer and explore the mechanisms underlying antitumor effects of SFN. Our data demonstrated that SFN inhibited thyroid cancer cell proliferation in a dose- and time-dependent manner, induced G2/M phase cell cycle arrest and apoptosis, and inhibited thyroid cancer cell migration and invasion by suppressing epithelial-mesenchymal transition (EMT) process and down-regulating expression of Slug, Twist, MMP-2 and -9. Mechanically, SFN inhibited thyroid cancer cell growth and invasiveness through repressing phosphorylation of Akt, up-regulating p21 expression mediated by activation of Erk and p38 signaling cascades, and inducing mitochondrial-mediated apoptosis via reactive oxygen species (ROS)-dependent pathway. Growth of xenograft tumors derived from thyroid cancer cell line FTC133 in nude mice was also significantly inhibited by SFN. Importantly, we did not find significant effect of SFN on body weight and liver function of mice. Collectively, we for the first time demonstrate that SFN is a potentially effective antitumor agent for thyroid cancer.
Keywords: thyroid cancer, sulforaphane (SFN), reactive oxygen species (ROS), signaling pathways
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