期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 28, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202103346
关键词
anticancer; iridium complex; NADH; photo catalysis; photodynamic therapy
资金
- National Natural Science Foundation of China [NSFC 22007104]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110601, 2021B1515020050]
- Science, Technology and Innovation Commission of Shenzhen Municipality Project [JCYJ20190807152616996]
- Summit Plan High level hospital construction project of Foshan [FSSYKF-2020002]
- DST, Government of India [DST/INSPIRE/04/2019/000492]
- U.S. National Science Foundation [CHE-1764264]
Four photo-catalysts were synthesized and characterized, showing strong visible light absorption and efficient photo-catalytic oxidation of cellular coenzymes. Among them, Ir2 exhibited superior anti-cancer activity against HeLa cells compared to a clinically used photosensitizer, and demonstrated in vivo photo-induced catalytic anticancer activity in mouse models.
Four photo-catalysts of the general formula [Ir(CO6/ppy)(2)(L)]Cl where CO6=coumarin 6 (Ir1-Ir3), ppy=2-phenylpyridine (Ir4), L=4 '-(3,5-di-tert-butylphenyl)-2,2 ' : 6 ',2 ''-terpyridine (Ir1), 4 '-(3,5-bis(trifluoromethyl)phenyl)-2,2 ' : 6 ',2 ''-terpyridine (Ir2 and Ir4), and 4-([2,2 ' : 6 ',2 ''-terpyridin]-4 '-yl)-N,N-dimethylaniline (Ir3) were synthesized and characterized. These photostable photo-catalysts (Ir1-Ir3) showed strong visible light absorption between 400-550 nm. Upon light irradiation (465 and 525 nm), Ir1-Ir3 generated singlet oxygen and induced rapidly photo-catalytic oxidation of cellular coenzymes NAD(P)H. Ir1-Ir3 showed time-dependent cellular uptake with excellent intracellular retention efficiency. Upon green light irradiation (525 nm), Ir2 provided a much higher photo-index (PI=793) than the clinically used photosensitizer, 5-aminolevulinicacid (5-ALA, PI>30) against HeLa cancer cells. The observed necro-apoptotic anticancer activity of Ir2 was due to the Ir2 triggered photo-induced intracellular redox imbalance (by NAD(P)H oxidation and ROS generation) and change in the mitochondrial membrane potential. Remarkably, Ir2 showed in vivo photo-induced catalytic anticancer activity in mouse models.
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