A wide variety of pyrrolizidine alkaloids, such as monocrotaline, and the clinically significant mitomycins and the related FR-900482, FK 973, and FR-66979 exert their cytotoxicity through the formation of DNA−DNA interstrand cross-links and DNA−protein cross-links. These naturally occurring antitumor antibiotics are generally either oxidatively or reductively activated in vivo forming a highly reactive
多种
吡咯里西啶
生物碱,如
野百合碱、具有临床意义的丝
裂霉素和相关的 FR-900482、FK 973 和 FR-66979,通过形成 DNA-DNA 链间交联和 DNA-蛋白质交联发挥其细胞毒性。链接。这些天然存在的抗肿瘤抗生素通常在体内被氧化或还原激活,形成高反应性的
吡咯型中间体,它负责最终的 DNA 交联反应。然而,这些氧化和还原途径通常会导致各种不良的毒性事件。随着对新的和细胞毒性较小的
抗肿瘤药物的需求不断增加,以及最近具有临床意义的光分离技术的成功,