Zhi-hong Zou, Xiao-bu Lan, Chun-lei Tang, Xiao-yun Zhu, Bao-min Liu, Hai Qian, Wen-long Huang and Yun-man Li Pages 711 - 716 ( 6 )
Multidrug resistance in cancer is a major cause of failure in cancer chemotherapy. In search of new compounds with strong reversal activity and simple molecular structure, we have synthesized a series of compounds in which different substituents were linked to the 2-position of the 6,7-dimethoxy-1-(3,4-dimethoxybenzyl)- tetrahydroisoquinoline system. Compounds were analyzed for their cytotoxicity by MTT in K562 cell line in vitro, all of the derivatives exhibited little cytotoxic activity. In the meantime, these compounds were evaluated by MTT in K562/A02 cell line in vitro, 6e, 6h and 7c exhibited similar or more potent activities than verapamil with the IC50 values at 0.66, 0.65 and 0.96μM, and with the ratio factor of 24.13, 24.50 and 16.59, respectively.
Multidrug resistance, anticancer, tetrahydroisoquinoline, MDR, cancer chemotherapy, Radix Stephaniae Tetrandrae, P-glycoprotein inhibitor, cyanoguanyl, ethanol
Centre of Drug Discovery, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing, Jiangsu 210009, China.