Organoiridium Photosensitizers Induce Specific Oxidative Attack on Proteins within Cancer Cells
作者:Pingyu Zhang、Cookson K. C. Chiu、Huaiyi Huang、Yuko P. Y. Lam、Abraha Habtemariam、Thomas Malcomson、Martin J. Paterson、Guy J. Clarkson、Peter B. O'Connor、Hui Chao、Peter J. Sadler
DOI:10.1002/anie.201709082
日期:2017.11.20
to cancer cells upon brief irradiation with low doses of visible light, and potent at sub-micromolar doses towards 3D multicellular tumor spheroids with 2-photon red light. Photoactivation causes oxidative damage to specific histidine residues in the key proteins in aldose reductase and heat-shock protein-70 within living cancer cells. The oxidative stress induced by iridium photosensitizers during photoactivation
强发光铱(III)络合物,[Ir(C,N)2 (S,S)]+ (1) 和 [Ir(C,N)2 (O,O)] (2),含有 C,N (苯基喹啉)、O,O(二酮)或 S,S(二硫酮)螯合配体已通过 X 射线晶体学和 DFT 计算进行了表征。它们在活癌细胞中具有较长的磷光寿命,可产生高量子产率 1 O2 ,并具有较大的 2 光子吸收截面。2 对细胞无毒,但在低剂量可见光短暂照射下对癌细胞具有强效细胞毒性,并且在亚微摩尔剂量下对 2 光子红光的 3D 多细胞肿瘤球体有效。光活化会对活癌细胞内醛糖还原酶和热休克蛋白 70 的关键蛋白中的特定组氨酸残基造成氧化损伤。光活化过程中铱光敏剂诱导的氧化应激可以增加糖酵解途径中涉及的酶的水平。