2月10日,美国化学会化学生物学杂志《ACS Chemical biology》上在线发表了中国科学院上海生命科学研究院植物生理生态研究所肖友利研究组题为“Profiling of Multiple Targets of Artemisinin Activated by Hemin in Cancer Cell Proteome”的研究论文。该工作揭示了青蒿素独特的过氧桥键结构被亚铁血红素激活并共价修饰相关蛋白的分子机制。
从药用植物黄花蒿中分离得到的青蒿素以其独特的分子结构不仅长期作为一线的抗疟疾药物,而且还具有多种其他生物活性。近年来,大量的体外或动物模型实验显示,青蒿素对多种癌细胞均有抑制作用,但人们对该药物的抗癌分子作用机制依然不是很清楚。
该研究组的周怡青博士和李伟超同学通过设计合成的以青蒿素为骨架的小分子探针,利用化学蛋白质组学策略,借助于青蒿素小分子探针对其作用靶点蛋白的识别和共价结合修饰的生物活性,在癌细胞蛋白质组中成功“钓”取并鉴定了79个可与青蒿素共价结合的蛋白;进一步研究发现,亚铁血红素在青蒿素过氧桥键激活和共价修饰蛋白的过程中发挥了重要作用;提出了分别依赖于青蒿素和亚铁血红素两个化合物结合修饰蛋白的两种分子抑制机制的结论。相比正常人体组织,癌细胞的生长需要更多更快的铁元素摄入;青蒿素针对癌细胞的这一属性共价结合多个靶标蛋白,扰乱癌细胞的多个正常生理途径,从而抑制癌细胞的生长和增殖。该研究为揭示青蒿素的抗癌机制提供了新认识和思路。
原文摘要:The antimalarial drug artemisinin is found to have diverse biological activities ranging from anti-inflammatory to anticancer properties; however, as of today, the cellular targets and mechanism of action of this important compound have remained elusive. Here, we report the global protein target profiling of artemisinin in the HeLa cancer cell proteome using a chemical proteomics approach. In the presence of hemin, multiple proteins were targeted by artemisinin probe through covalent modification. Further studies revealed that reducing of hemin to heme by protein thiols was essential for endoperoxide activation and subsequent protein alkylation. Artemisinin may exert its synergistic therapeutic anticancer effects via modulation of a variety of cellular pathways through acting on multiple targets.