期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 16, 页码 4111-4120出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201705640
关键词
apoptosis; basal cell carcinoma; copper complexes; photodynamic therapy; Schiff bases
资金
- Ministry of Science and Technology of Taiwan [MOST 104-2113-M-005-015-MY3, 106-2113-M-005-014-MY3]
Photodynamic therapy (PDT) is a promising and minimally invasive method for the treatment of superficial diseases, and photosensitizers with high phototoxicity indices (defined as (IC50dark)/(IC50irradiation)) are essential for the development of ideal photosensitizing properties for this technology. Herein, we report a series of photocytotoxic copper(II) complexes [Cu((R)QYMP)(dppn)] ((R)QYMP=N,N,O-tridentate Schiff-base derivatives, dppn=benzo[i]dipyrido[3,2-a;2,3-c]phenazine), the structures of which have been confirmed by mass spectrometry and FTIR spectroscopy. X-ray crystallography revealed that the CuN4O core of the [Cu((cumyl)QYMP)(dppn)](ClO4) complex (3) has a distorted square-pyramidal geometry. Phototoxicity indices of 329 against human squamous cell carcinoma (SCC15) and 296 against basal cell carcinoma (BCC) cell lines have been determined with [Cu((3-OMe)QYMP)(dppn)](ClO4) (4). This can be attributed to the formation of reactive oxygen species, cell apoptosis, and caspase-3 activation, indicating high potential of complex 4 as a photosensitizer candidate in PDT. Thus, copper complexes bearing suitable Schiff-base ligands with a dppn co-ligand may be considered for the design of efficient metal-based anticancer agents for PDT.
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