Discovery of 5-Substituted-6-chlorouracils as Efficient Inhibitors of Human Thymidine Phosphorylase
作者:Radim Nencka、Ivan Votruba、Hubert Hřebabecký、Petr Jansa、Eva Tloušt'ová、Květa Horská、Milena Masojídková、Antonín Holý
DOI:10.1021/jm070644i
日期:2007.11.1
that 6-halouracils substituted at position C5 by certain hydrophobic groups exhibit significant inhibitory activity against this enzyme. The most potent compounds bear a five- or six-membered cyclic substituent containing a pi-electron system at C5 and a chlorine atom attached at C6. 6-Chloro-5-cyclopent-1-en-1-yluracil 7a is the most efficient derivative in this study, with Ki = 0.20 +/- 0.03 microM
胸苷磷酸化酶在血管生成中起重要作用,这是治疗癌症和其他疾病的有吸引力的靶标。在我们不断努力开发新型胸苷磷酸化酶抑制剂的过程中,我们发现在C5位置被某些疏水基团取代的6-氟尿嘧啶对这种酶表现出显着的抑制活性。最有效的化合物带有一个五元或六元环状取代基,在C5处含有一个π电子系统,在C6处含有一个氯原子。6-氯-5-环戊-1-烯-1-基尿嘧啶7a是这项研究中最有效的衍生物,对于在V79细胞和Ki中表达的胸苷磷酸化酶,Ki = 0.20 +/- 0.03 microM(Ki / dThdKm = 0.0017)从胎盘中纯化的酶为0.29 +/- 0.04 microM(Ki / dThdKm = 0.0024)。