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JBC:俞强等发现选择性诱导肿瘤细胞凋亡的小分子化合物NPP

2013-05-06 上海药物所 上海药物所

诱导细胞凋亡是一种有效的抗肿瘤策略。然而如何选择性地诱导肿瘤细胞凋亡,降低对正常细胞的损伤,对肿瘤研究者来说一直都是一项挑战。上海药物研究所俞强课题组与龙亚秋课题组合作,于3月29日报道了一个可以选择性诱导肿瘤细胞发生凋亡的全新结构的小分子化合物NPP,并对其选择性抗肿瘤的分子机制进行了深入研究。 研究发现含丙炔酸酯结构的NPP可以在被细胞色素P450酶代谢的过程中产生活性氧ROS。肿瘤细胞由于

诱导细胞凋亡是一种有效的抗肿瘤策略。然而如何选择性地诱导肿瘤细胞凋亡,降低对正常细胞的损伤,对肿瘤研究者来说一直都是一项挑战。上海药物研究所俞强课题组与龙亚秋课题组合作,于3月29日报道了一个可以选择性诱导肿瘤细胞发生凋亡的全新结构的小分子化合物NPP,并对其选择性抗肿瘤的分子机制进行了深入研究。

研究发现含丙炔酸酯结构的NPP可以在被细胞色素P450酶代谢的过程中产生活性氧ROS。肿瘤细胞由于长期处于氧化应激状态,在NPP诱导的ROS刺激下容易越过临界点发生细胞死亡,而正常细胞基础ROS水平低,抗氧化能力强,能够抵御一定程度的ROS刺激。在三十多株细胞系上对NPP进行敏感性研究,发现该化合物对于p53突变的肿瘤细胞具有特别的选择性,将非转化细胞的p53基因沉默之后,细胞对NPP的敏感度显著上升。将NPP与其他ROS诱导剂进行比较,发现活性氧产生的方式、剂量、时程以及地点都会影响细胞的命运。

研究提示NPP并非通过线粒体和内质网上的P450酶发生作用,而是被细胞膜附近的P450代谢,在近膜区域产生ROS,抑制酪氨酸磷酸酶PTP的活性和JAK/STAT信号,启动线粒体介导的细胞凋亡程序。利用肿瘤细胞氧化应激的特性进行选择性的治疗,是近几年提出的新策略,该策略的安全性和有效性急需进一步的证明。这项研究不仅提供了一个具有良好活性和选择性的抗肿瘤化合物,同时对于理解活性氧的产生和功能,以及基于活性氧的抗肿瘤策略潜在的应用前景具有重要的指导意义。该研究已正式发表于生化领域国际权威杂志The Journal of Biological Chemistry上。

研究工作得到了国家自然科学基金、国家科技部、国家重点基础研究发展计划的资助。

肿瘤细胞相关的拓展阅读:

doi:10.1074/jbc.M112.429316
PMC:
PMID:

Selective Induction of Tumor Cell Apoptosis by a Novel P450-mediated Reactive Oxygen Species (ROS) Inducer Methyl 3-(4-Nitrophenyl) Propiolate*

Xiaoxiao Sun‡, Midan Ai‡, Ying Wang‡, Shensi Shen‡, Yuan Gu‡, Yi Jin§, Zuyu Zhou§, Yaqiu Long§ and Qiang Yu‡,1

Induction of tumor cell apoptosis has been recognized as a valid anticancer strategy. However, therapeutic selectivity between tumor and normal cells has always been a challenge. Here, we report a novel anti-cancer compound methyl 3-(4-nitrophenyl) propiolate (NPP) preferentially induces apoptosis in tumor cells through P450-catalyzed reactive oxygen species (ROS) production. A compound sensitivity study on multiple cell lines shows that tumor cells with high basal ROS levels, low antioxidant capacities, and p53 mutations are especially sensitive to NPP. Knockdown of p53 sensitized non-transformed cells to NPP-induced cell death. Additionally, by comparing NPP with other ROS inducers, we show that the susceptibility of tumor cells to the ROS-induced cell death is influenced by the mode, amount, duration, and perhaps location of ROS production. Our studies not only discovered a unique anticancer drug candidate but also shed new light on the understanding of ROS generation and function and the potential application of a ROS-promoting strategy in cancer treatment.

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    2013-08-12 lily1616
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    2014-01-20 宋威
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