The main drawback in the use of most nucleoside anticancer agents originates from their hydrophilic nature, of which property requires a high and frequent dosage for an intravenous administration. Unlike other nucleoside anti-tumor agents, troxacitabine appears to predominantly enter tumor cells by passive diffusion rather then by using nucleoside transporters, although this may be model dependent. Accordingly, in the present work, a small library of twenty troxacitabine prodrugs has been synthesized using a parallel approach in order to evaluate the relationship between the lipophilicity of the prodrugs and their antitumor activity. Biological evaluation of the prodrugs on two non-small cell lung cancer cell lines (A549 and SW1573) and in pancreatic cell lines clearly showed better antitumor activity than that of troxacitabine, with IC
50
values in the nanomolar range.
大多数核苷类抗癌药物的主要缺点源于它们亲
水性的特性,这种特性需要高剂量和频繁的静脉注射。与其他核苷类
抗肿瘤药物不同,托沙他滨似乎主要通过被动扩散进入肿瘤细胞,而不是使用核苷转运体,尽管这可能是模型相关的。因此,在本研究中,使用并行方法合成了二十种托沙他滨前药库,以评估前药的亲脂性与其抗肿瘤活性之间的关系。对两种非小细胞肺癌
细胞系(A549和SW1573)和胰腺
细胞系的前药进行
生物评价,明显显示出比托沙他滨更好的抗肿瘤活性,IC50值在纳摩尔范围内。