Hydroxycinnamic Acids as DNA-Cleaving Agents in the Presence of Cu<sup>II</sup>Ions: Mechanism, StructureâActivity Relationship, and Biological Implications
作者:Gui-Juan Fan、Xiao-Ling Jin、Yi-Ping Qian、Qi Wang、Ru-Ting Yang、Fang Dai、Jiang-Jiang Tang、Ya-Jing Shang、Li-Xia Cheng、Jie Yang、Bo Zhou
DOI:10.1002/chem.200901627
日期:2009.11.23
The effectiveness of hydroxycinnamic acids (HCAs), that is, caffeic acid (CaA), chlorogenic acid (ChA), sinapic acid (SA), ferulic acid (FA), 3‐hydroxycinnamic acid (3‐HCA), and 4‐hydroxycinnamic acid (4‐HCA), as pBR322 plasmid DNA‐cleaving agents in the presence of CuII ions was investigated. Compounds bearing o‐hydroxy or 3,5‐dimethoxy groups on phenolic rings (CaA, SA, and ChA) were remarkably more
羟基肉桂酸(HCA)的有效性,即咖啡酸(CaA),绿原酸(ChA),芥子酸(SA),阿魏酸(FA),3-羟基肉桂酸(3-HCA)和4-羟基肉桂酸酸(4-HCA),作为在Cu II离子存在下的pBR322质粒DNA裂解剂进行了研究。酚环上带有邻羟基或3,5-二甲氧基的化合物(CaA,SA和ChA)比不带有此类基团的化合物更有效地引起DNA损伤。此外,在所检查的HCA中,CaA是最活跃的。通过使用特定的清除剂ROS和Cu I抑制DNA断裂,证实了活性氧(ROS)和Cu I离子参与了DNA损伤。螯合剂。还研究了CaA和Cu II离子之间的相互作用以及乙二胺四乙酸(EDTA),溶剂和pH值对相互作用的影响,以帮助通过UV / Vis光谱分析阐明详细的前氧化机理。根据这些观察结果,建议是由CaA酚酸根阴离子而不是母体分子与Cu II离子作为双齿配体螯合,从而促进分子内电子转移形成相应的CaA半醌自由