The invention relates to the synthesis of a second-generation camptothecin glucuronide prodrug (BQC-G) of a potent anticancer camptothecin derivative 5,6-dihydro-4H-benzo[de]quinoline-camptothecin (BQC). BQC-G was over 4000 times more water soluble than BQC, displayed good stability in human plasma and was an excellent substrate for enzymatic hydrolysis by bacterial and human β-glucuronidases. BQC-G was about 30 times less toxic than BQC, but was as toxic as BQC after hydrolysis of the glucuronide moiety by β-glucuronidase. In the presence of human serum albumin, BQC-G displayed lower cytotoxicity (IC
50
=1080 nM) but could be activated by β-glucuronidase to display potent activity (IC
50
=13.3 nM).
本发明涉及一种二代
喜树碱葡萄糖醛酸酯前药(BQC-G)的合成,该前药是一种有效的抗癌
喜树碱衍
生物5,6-二氢-4H-苯并[de]
喹啉-
喜树碱(BQC)。BQC-G比BQC
水溶性高4000倍以上,在人类血浆中表现出良好的稳定性,并且是细菌和人类β-
葡萄糖苷酶的优良底物。BQC-G的毒性约为BQC的30倍,但经过β-
葡萄糖苷酶
水解
葡萄糖醛酸酯基团后与BQC的毒性相当。在人类
血清白蛋白存在下,BQC-G表现出较低的细胞毒性(IC50 = 1080 nM),但可以通过β-
葡萄糖苷酶激活,显示出强效活性(IC50 = 13.3 nM)。