College of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, 311400, China.
Libraries of Zhejiang Chinese Medical University, Zhejiang Chinese Medical University, Hangzhou, 310053, China.
Theranostics. 2020 Aug 2;10(21):9865-9887. doi: 10.7150/thno.46771. eCollection 2020.
Glutathione (GSH), the primary antioxidant in cells, could fight against oxidative stress. Tumor cells display a higher GSH level than normal cells for coping with the hyperoxidative state, which meets the requirements of enhanced metabolism and vicious proliferation. Therefore, the consumption of GSH will lead to cell redox imbalance and impede life activities. Herein, targeted sorafenib (SFB) loaded manganese doped silica nanoparticle (FaPEG-MnMSN@SFB) was constructed, which could destroy the intracellular redox homeostasis by consuming GSH. In this study, MnMSN was prepared by an optimized one-pot Stober's method for loading SFB, and FaPEG chain was modified on the surface of MnMSN to achieve long circulation and targeted delivery. The anticancer efficacy and mechanism of the designed FaPEG-MnMSN@SFB were assessed both and FaPEG-MnMSN@SFB exhibited efficient antitumor activity by dual depleting intracellular GSH (the degradation of MnMSN would consume intracellular GSH and the SFB would inhibit the effect of X transport system to inhibit GSH synthesis). Moreover, disruption of redox balance would lead to apoptosis and reactive oxygen species (ROS)-dependent ferroptosis of tumor cells. Such a GSH-starvation therapeutic strategy would cause multi-path programmed cell death and could be a promising strategy for cancer therapy.
谷胱甘肽(GSH)是细胞中的主要抗氧化剂,可以对抗氧化应激。肿瘤细胞显示出比正常细胞更高的 GSH 水平,以应对过氧化物状态,这满足了增强代谢和恶性增殖的要求。因此,消耗 GSH 会导致细胞氧化还原失衡并阻碍生命活动。在此,构建了靶向索拉非尼(SFB)负载的锰掺杂二氧化硅纳米颗粒(FaPEG-MnMSN@SFB),它可以通过消耗 GSH 破坏细胞内氧化还原稳态。在这项研究中,通过优化的一锅 Stober 法制备了 MnMSN 用于负载 SFB,并在 MnMSN 表面修饰了 FaPEG 链以实现长循环和靶向递送。设计的 FaPEG-MnMSN@SFB 的抗癌功效和机制进行了评估。FaPEG-MnMSN@SFB 通过双重耗尽细胞内 GSH(MnMSN 的降解会消耗细胞内 GSH,而 SFB 会抑制 X 转运系统的作用以抑制 GSH 合成)表现出高效的抗肿瘤活性。此外,氧化还原平衡的破坏会导致肿瘤细胞凋亡和依赖活性氧(ROS)的铁死亡。这种 GSH 饥饿治疗策略会导致多途径程序性细胞死亡,可能是癌症治疗的一种有前途的策略。