Traditional antitumor drugs such as camptothecin and paclitaxel derivatives are widely used in cancer chemotherapy. However, the major defects of those agents include severe toxicity and poor water solubility. With these in mind, a novel multifunctional linker was designed and two Cathepsin B (CTB) sensitive CPT conjugates (9a and 9b) were synthesized. Through click chemistry, additional functional group mPEG2000 can be easily introduced into these conjugates. The introduction of mPEG2000 fragment resulted in the formation of nanoparticles 1a and 1b (average particle sizes were 216.9 and 257.9 nm, respectively) with significantly increased water solubility (more than 19 000-fold). The release of therapeutic drug SN-38 in the presence of CTB was confirmed by HPLC and prodrug 1a showed potent in vitro cytotoxicity against all tested cell lines. Impressively, compared with irinotecan, CTB sensitive prodrug 1a displayed similar in vivo efficacy with remarkable decreased in vivo toxicity.
传统的
抗肿瘤药物,如
喜树碱和
紫杉醇衍
生物,在癌症化疗中被广泛应用。然而,这些药物的主要缺陷包括严重的毒性和较差的亲
水性。考虑到这些问题,设计了一种新型多功能连接体,并合成了两种
组织蛋白酶B(CTB)敏感的C
PT偶联物(9a和9b)。通过点击
化学,可以轻松地将额外的功能团mP
EG2000引入这些偶联物中。引入mP
EG2000片段后,形成了纳米粒子1a和1b(平均粒径分别为216.9和257.9 nm),其
水溶性显著增加(超过19,000倍)。通过HPLC确认了在存在CTB的情况下治疗药物SN-38的释放,且前药1a对所有测试的
细胞系显示出了强有力的体外细胞毒性。值得注意的是,与
伊立替康相比,CTB敏感的前药1a在体内显示出相似的疗效,但体内毒性显著降低。