20115-65-5Relevant articles and documents
Platinum (II)-coordinated Portulaca oleracea polysaccharides as metal-drug based polymers for anticancer study
Han, Qianqian,Huang, Lirong,Wang, Ying,Sun, Shixin,Huang, Hao,Li, Fei,Wang, Fangtian,Chen, Ligen,Zhang, Hongmei,Wang, Yanqing
, (2021/02/27)
Novel polysaccharide-platinum conjugated polymers bearing alendronate on Portulaca oleracea polysaccharides (PPS) were designed and synthesized. Their chemical structures and properties were characterized by Fourier transform infrared spectroscopy (FT-IR), 1H NMR and 31P NMR spectroscopy, Thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), UV–vis spectrophotometer (UV–vis) and other analysis methods. The results demonstrated that alendronate can be used as the linker of Portulaca oleracea polysaccharides and platinum compounds. Portulaca oleracea polysaccharides-alendronate (PPS-ALN) conjugates exhibited stronger antioxidant ability than PPS. The cytotoxicity assay to cancer cells was tested in vitro, and the Portulaca oleracea polysaccharides-alendronate-platinum (PPS-ALN-Pt) conjugates strongly inhibited the proliferation of cancer cells than PPS and PPS-ALN. The evaluation of complexes affinity toward supercoiled plasmid DNA, displayed a high DNA interaction. Interestingly, the platinum conjugates displayed immunological competence in HeLa cells by cellular immunofluorescence assay. Besides, the cellular platinum accumulation of PPS-ALN-Pt conjugates was higher than that of cisplatin in HeLa cells, implying that the polysaccharide-platinum conjugated polymers might have a synergistically therapeutic application in metal anticancer drug delivery.
Stereospecific hydrogen-bonding in mononucleotide adducts of platinum anticancer complexes in aqueous solution
Berners-Price, Susan J.,Frey, Urban,Ranford, John D.,Sadler, Peter J.
, p. 8649 - 8659 (2007/10/02)
The ammine and amine N-H 1H NMR resonances of Pt(II) complexes containing 5′-phosphate derivatives of nucleobases undergo significant low-field shifts in aqueous solution consistent with stereospecific H-bonding between Pt-NH protons and cis nucleotide 5′-phosphate groups. The effects are strongest for NH protons held rigidly in a chelate ring (ethylenediamine, en, complexes), when the phosphate is fully deprotonated, and when rotation about Pt-N7 (head-to-tail isomerism) is slow, as in [Pt(en)(5′-AMP-N7)2]2+. The temperature dependences of Pt-NH 1H NMR resonances for these complexes are low (3| ppm K-1) but not simply diagnostic of H-bonding. The nucleobase complexes investigated were cis-[Pt(X)(Y)(15NH3)(15NH2CH 3)]2+, [Pt(15N-en)(X)(Y)]2+, and [Pt(N,N-Me2-en)(X)(Y)]2+ where X = Y = 5′-GMP, 5×-dGMP, 3×-GMP, G, 5×-AMP, or 3×-AMP or Y = Cl or H2O. Data for the complexes trans-[Pt(X)(Y)(NH3)2]n+, X, Y = 5′-GMP, Cl, H2O are reported for comparison with the cis analogues, and the shifts are rationalized in terms of cis and trans influences.
