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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Enhancing the photocytotoxic potential of curcumin on terpyridyl lanthanide(iii) complex formation
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Enhancing the photocytotoxic potential of curcumin on terpyridyl lanthanide(iii) complex formation

机译:增强姜黄素对叔吡啶基镧系元素(iii)复合物形成的光细胞毒性潜力

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Lanthanide(iii) complexes [Ln(R-tpy)(cur)(NO_3)_2] (Ln = La(iii) in 1, 2; Gd(iii) in 5, 6) and [Ln(R-tpy)(scur)(NO_3) _2] (Ln = La(iii) in 3, 4; Gd(iii) in 7, 8), where R-tpy is 4′-phenyl-2,2′:6′,2′′-terpyridine (ph-tpy in 1, 3, 5, 7), 4′-(1-pyrenyl)-2,2′:6′,2′′-terpyridine (py-tpy in 2, 4, 6, 8), Hcur is curcumin (in 1, 2, 5, 6) and Hscur is diglucosylcurcumin (in 3, 4, 7, 8), were prepared and their DNA photocleavage activity and photocytotoxicity studied. Complexes [La(ph-tpy)(cur)(NO _3)_2] (1) and [Gd(ph-tpy)(cur)(NO_3)_2] (5) were structurally characterized. The complexes in aqueous-DMF showed an absorption band near 430 nm and an emission band near 515 nm when excited at 420 nm. The complexes are moderate binders to calf-thymus DNA. They cleave plasmid supercoiled DNA to its nicked circular form in UV-A (365 nm) and visible light (454 nm) via~1O_2 and OH pathways. The complexes are remarkably photocytotoxic in HeLa cells in visible light (λ = 400-700 nm) and are non-toxic in the dark. FACScan analysis of the HeLa cells treated with 2 and 4 showed cell death via an apoptotic pathway. Nuclear localization of 1-4 is evidenced from confocal imaging on HeLa cells. The hydrolytic instability of curcumin gets significantly reduced upon binding to the lanthanide ions while retaining its photocytotoxic potential.
机译:镧系元素(iii)络合物[Ln(R-tpy)(cur)(NO_3)_2](Ln = 1,2中的La(iii); 5、6中的Gd(iii))和[Ln(R-tpy)( scur)(NO_3)_2](Ln = 3,4中的La(iii); Gd(iii)在7,8中),其中R-tpy是4'-phenyl-2,2':6',2'' -叔吡啶(ph-tpy in 1,3,5,7),4'-(1-pyrenyl)-2,2':6',2''-terpyridine(py-tpy in 2,4,6,6,8 ),制备Hcur是姜黄素(1、2、5、6)和Hscur是二葡糖基姜黄素(3、4、7、8),并研究其DNA的光切割活性和光细胞毒性。 [La(ph-tpy)(cur)(NO _3)_2](1)和[Gd(ph-tpy)(cur)(NO_3)_2](5)的结构表征。当在420 nm激发时,DMF水溶液中的络合物显示出430 nm附近的吸收带和515 nm附近的发射带。该复合物是小牛胸腺DNA的适度结合物。他们通过〜1O_2和OH途径在UV-A(365 nm)和可见光(454 nm)中将质粒超螺旋DNA切割成有切口的环状形式。在可见光(λ= 400-700 nm)下,该复合物在HeLa细胞中具有明显的光细胞毒性,而在黑暗中则无毒。用2和4处理的HeLa细胞的FACScan分析显示,细胞通过凋亡途径死亡。从HeLa细胞上的共聚焦成像可以证明1-4的核定位。姜黄素的水解不稳定性在与镧系元素离子结合后显着降低,同时保留了其光细胞毒性潜力。

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