Icaritin synergistically enhances the radiosensitivity of 4T1 breast cancer cells.

Icaritin synergistically enhances the radiosensitivity of 4T1 breast cancer cells.
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DOI:
10.1371/journal.pone.0071347
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Zhang W
Zhang W
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hong J;Zhang Z;Lv W;Zhang M;Chen C;Yang S;Li S;Zhang L;Han D;Zhang W

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淫羊藿苷(ICT)是从淫羊藿属植物中分离得到的淫羊藿苷的一种水解物。本研究以小鼠4T1乳腺癌细胞为研究对象,探讨淫羊藿苷的放射增敏作用及其可能机制。在克隆形成实验中,淫羊藿苷3µM或6µM与6或8GY电离辐射(IR)相结合,其增强比(ER)分别为1.18或1.28,组合指数(CI)分别为0.38或0.19,剂量减少指数(DRI)分别为2.51或5.07。提示淫羊藿苷具有协同杀伤作用(?)辐射对肿瘤细胞的影响。这种作用可能与ICT的生物学活性有关:1)以剂量和时间依赖的方式发挥抗增殖作用,这与IR的杀伤作用不同,但可能与IR协同作用;2)抑制IR诱导的ERK1/2和AKT两条生存通路的激活;3)诱导G2/M期阻滞,增强IR的杀伤作用;4)与IR协同促进细胞凋亡。此外,ICT还抑制鸡胚绒毛尿囊膜(CAM)实验中的血管生成。综上所述,ICT是一种新型的放射增敏剂,可以增强IR或其他疗法的抗癌效果。
Icaritin (ICT) is a hydrolytic form of icariin isolated from plants of the genus Epimedium. This study was to investigate the radiosensitization effect of icaritin and its possible underlying mechanism using murine 4T1 breast cancer cells. The combination of Icaritin at 3 µM or 6 µM with 6 or 8 Gy of ionizing radiation (IR) in the clonogenic assay yielded an ER (enhancement ratio) of 1.18 or 1.28, CI (combination index) of 0.38 or 0.19 and DRI (dose reducing index) of 2.51 or 5.07, respectively. These strongly suggest that Icaritin exerted a synergistic killing (?) effect with radiation on the tumor cells. This effect might relate with bioactivities of ICT: 1) exert an anti-proliferative effect in a dose- and time-dependent manner, which is different from IR killing effect but likely work together with the IR effect; 2) suppress the IR-induced activation of two survival paths, ERK1/2 and AKT; 3) induce the G2/M blockage, enhancing IR killing effect; and 4) synergize with IR to enhance cell apoptosis. In addition, ICT suppressed angiogenesis in chick embryo chorioallantoic membrane (CAM) assay. Taken together, ICT is a new radiosensitizer and can enhance anti-cancer effect of IR or other therapies.
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