Thirty novel 20 (S)-O-linked camptothecin (CPT) glycoconjugates were synthesized. They showed more potent in vitro cytotoxicities over irinotecan, but very weak direct topoisomerase I (Topo I) inhibition was observed at 100.0 μM. Oligosaccharide types, length of a PEG linker and acetyl groups exerted obvious effects on cytotoxicity, selectivity, water solubility and stability of the newly synthesized CPT glycoconjugates. Construct 40, with a bleomycin (BLM) disaccharide linked to diethylene glycol in the introduced ester moiety, demonstrated a superior antitumor activity and a distinct selectivity compared to CPT. No toxicity was detectable in animal acute toxicity intravenously (160 mg/kg). Collectively, attachment of oligosaccharides with tumor targeting to 20 (S)-OH of CPT could offer a solution to the daunting problems posed by current Topo I poisons.

合成了三十种新颖的20（S）-O-连接的喜树碱（CPT）糖缀合物。他们表现出更有效的体外细胞毒性过伊立替康，但非常弱的直接拓扑异构酶I在100.0观察（TOPO I）抑制μ M.寡糖类型，PEG接头的长度和乙酰基作用于细胞毒性，选择性，水溶性明显影响，并新合成的CPT糖缀合物的稳定性。结构40与CPT相比，博来霉素（BLM）二糖与引入的酯部分中的二甘醇相连，具有更高的抗肿瘤活性和独特的选择性。静脉内动物急性毒性（160 mg / kg）未检测到毒性。总的来说，将具有靶向肿瘤的寡糖附着到CPT的20（S）-OH上可以为当前的Topo I毒药带来的艰巨问题提供解决方案。