Polypyridyl Co(II)-Curcumin Complexes as Photo-activated Anticancer and Antibacterial Agents.
Chembiochem 2023;
24:e202300033. [PMID:
36763497 DOI:
10.1002/cbic.202300033]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 02/08/2023] [Accepted: 02/10/2023] [Indexed: 02/11/2023]
Abstract
Four new Co(II) complexes viz., [Co(bpy)2(acac)]Cl (1), [Co(phen)2(acac)]Cl (2), [Co(bpy)2(cur)]Cl (3), [Co(phen)2(cur)]Cl (4), where bpy = 2,2'-bipyridine (1 and 3), phen = 1,10-phenanthroline (2 and 4), acac = acetylacetonate (1 and 2), cur = curcumin monoanion (3 and 4) were designed, synthesized and fully characterized. The X-ray crystal structures of 1 and 2 indicated that CoN4O2 core has a distorted octahedral geometry. The photoactivity of these complexes was tuned by varying the π conjugation in the ligands. 3 and 4 depicted an intense absorption band near 435 nm, which made them useful as visible-light PDT agents. Curcumin complexes 3 and 4 showed fluorescence with λemi = ca. 565 nm. This fluorescence was useful to study their intracellular uptake and localization in MCF-7 cancer cells. The acetylacetonate complexes (1 and 2) are used as control complexes to understand the role of curcumin. The white light-triggered anticancer profiles of the cytosol targeting complexes 3 and 4 were investigated in detail. These non-dark toxic complexes displayed significant apoptotic photo-cytotoxicity (under visible light) against MCF-7 cells via ROS generation. The control complexes 1 and 2 did not induce significant cell death in light and dark. Interestingly, 1-4 produced a remarkable antibacterial response on light exposure. Overall, the reported results here can increase the boundary of the Co(II)-based anticancer and antibacterial drug development.
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