Synthesis, Biological Activity, and DNA-Damage Profile of Platinum-Threading Intercalator Conjugates Designed To Target Adenine
作者:Rajsekhar Guddneppanavar、Gilda Saluta、Gregory L. Kucera、Ulrich Bierbach
DOI:10.1021/jm060035v
日期:2006.6.1
chromatography-electrospray mass spectrometry analysis indicate that the new conjugates produce PT-ACRAMTU-type DNA damage. Platinum-modified 2'-deoxyguanosine, dG, and several dinucleotide fragments, d(NpN)*, were detected. One of the conjugates showed significantly higher levels of binding to A-containing sites than conjugate 2 (35 +/- 3% vs 24 +/- 3%). Possible structure-activity relationships are
PT-ACRAMTU [PtCl(en)(ACRAMTU)](NO3)2,2; ACRAMTU = 1- [2-(acridin-9-氨基氨基)乙基] -1,3-二甲基硫脲,1,en =乙烷-1,2-二胺}是一系列靶向DNA的腺嘌呤-亲和双插入的原型/镀铂剂。合成了几种新颖的4,9-二取代的cr啶和相应的铂-ac啶共轭物。新近引入的4-羧酰胺侧链包含H键供体/受体功能,旨在促进凹槽和序列特异的铂结合。在HL-60(白血病)和H460(肺癌)癌细胞中,观察到IC50值在微摩尔至毫摩尔范围内。与原型1相比,几种嵌入剂显示出增强的细胞毒性,但缀合物2似乎是最有效的杂合剂。酶消化分析结合液相色谱-电喷雾质谱分析表明,新的结合物会产生PT-ACRAMTU型DNA损伤。检测到铂修饰的2'-脱氧鸟苷dG和几个二核苷酸片段d(NpN)*。一种缀合物显示出与含A位点的结合水平显着高于缀合物2(35 +/-