In vitro studies of 3-hydroxy-4-pyridinones and their glycosylated derivatives as potential agents for Alzheimer's disease
作者:David E. Green、Meryn L. Bowen、Lauren E. Scott、Tim Storr、Michael Merkel、Karin Böhmerle、Katherine H. Thompson、Brian O. Patrick、Harvey J. Schugar、Chris Orvig
DOI:10.1039/b918439b
日期:——
Glycosides of 3-hydroxy-4-pyridinones were synthesized and characterized by mass spectrometry, elemental analysis, 1H and 13C NMR spectroscopy, and in one case by X-ray crystallography. The Cu2+ complex of a novel 3-hydroxy-4-pyridinone was synthesized and characterized by IR and X-ray crystallography, showing the ability of these compounds to chelate potentially toxic metal ions. An MTT cytotoxicity assay of a selected glycosylated compound showed a relatively low toxicity of IC50 = 570 ± 90 μM in a human breast cancer cell line. The pyridinone glycosides could be cleaved by a broad specificity beta-glycosidase, Agrobacterium sp.β-glucosidase, and for one compound kcat and Km were determined to be 19.8 s−1 and 1.52 mM, respectively. Trolox Equivalent Antioxidant Capacity (TEAC) values were determined for the free pyridinones, indicating the good antioxidant properties of these compounds. Metal-Aβ1-40 aggregates with zinc and copper were resolubilized by the non-glycosylated pyridinone ligands.
3-羟基-4-吡啶酮的糖苷被合成并通过质谱、元素分析、1H和13C核磁共振波谱进行表征,其中一例通过X射线晶体学进行表征。合成并表征了一种新型3-羟基-4-吡啶酮的Cu2+配合物,通过IR和X射线晶体学表明这些化合物具有潜在的螯合有毒金属离子的能力。对选定的糖基化化合物进行的MTT细胞毒性测定显示,在人乳腺癌细胞系中具有相对较低的毒性,IC50 = 570 ± 90 μM。吡啶酮糖苷可以通过广特异性β-糖苷酶,即根癌农杆菌β-葡糖苷酶分解,对于一种化合物,kcat和Km分别为19.8 s−1和1.52 mM。测定了自由吡啶酮的Trolox等效抗氧化能力(TEAC)值,表明这些化合物具有良好的抗氧化性能。非糖基化的吡啶酮配体可以解溶锌和铜的金属-Aβ1-40聚集体。