Antitumor activity of terpenoids against classical and atypical multidrug resistant cancer cells
摘要:
Nineteen terpenoids, including macrocyclic diterpenes, diterpenic lactones and other polycyclic diterpenes, steroids and a triterpene isolated from the methanolic extracts of Euphorbia species, were evaluated for their potential antineoplastic activity in various human cancer cell lines that were derived from three tumor entities gastric (EPG85-257). pancreatic (EPP85-181) and colon (HT-29) carcinomas Furthermore, different multidrug-resistant variants of these cancer cell lines with over-expression of MDR1/P-gp or no MDR1/P-gp expression were also investigated In parental drug-sensitive cell lines, the tested compounds showed a moderate/weak antiproliferative effect or were inactive. Most of them were found more effective in drug-resistant cells than in the parental, drug-sensitive ones, and some of them showed high antineoplastic efficacy in classical or atypical drug-resistant cells. The most active compounds were the lathyrane diterpenes latilagascenes C and D. and the diterpenic lactones 3 beta-acetoxy-helioscopinolide B and helioscopinolide E which exhibited high antineoplastic activities against the drug-resistant subline EPG85-257RDB derived from gastric carcinoma In addition, the macrocyclic lathyrane diterpene jolkinol B was found to be highly effective in the multidrug-resistant variant HT-29RNOV. (C) 2009 Elsevier GmbH. All rights reserved.