on the opposite DNA strand. New derivatives based on the pixantrone and mitoxantrone backbones were synthesized, and these incorporated primary amino groups as well as extended side chains. The stability of DNA adducts increased with increasing side chain length of the derivatives. A mitoxantrone derivative bearing extended side chains (7) formed the most stable adducts with ∼100-fold enhanced stability
米托
蒽醌是一种抗癌剂,可作为拓扑异构酶II毒药,但是,它也可以被
甲醛激活以形成DNA加合物。Pixantrone是一种2-氮杂-
蒽二酮,其侧链具有末端伯
氨基,与米托
蒽醌相比,能更有效地与DNA形成
甲醛介导的加合物。分子模型研究表明,
蒽二酮侧臂“连接子”区域的延伸将使末端伯
氨基具有更大的柔韧性,从而可进入相对DNA链上的
鸟嘌呤残基。合成了基于pixantrone和mitoxantrone主链的新衍
生物,这些衍
生物结合了伯
氨基和延伸的侧链。DNA加合物的稳定性随衍
生物侧链长度的增加而增加。7)与米托
蒽醌相比,形成了最稳定的加合物,稳定性提高了约100倍。这一发现非常令人感兴趣,因为预期寿命长的药物-DNA加合物会在细胞周期的所有阶段扰乱DNA依赖性功能。