Synthesis, Activity, and Pharmacophore Development for Isatin-β-thiosemicarbazones with Selective Activity toward Multidrug-Resistant Cells
摘要:
We have recently identified a new class of compounds that selectively kill cells that express P-glycoprotein (P-gp, MDR1), the ATPase efflux pump that confers multidrug resistance on cancer cells. Several isatin-beta-thiosemicarbazones from our initial study have been validated and a range of analogues synthesized and tested. A number demonstrated improved MDR1-selective activity over the lead, NSC73306 (1). Pharmacophores for cytotoxicity and MDR1 selectivity were generated to delineate the structural features required for activity. The MDR1-selective pharmacophore highlights the importance of aromatic/hydrophobic features at the N4 position of the thiosemicarbazone and the reliance on the isatin moiety as key bioisosteric contributors. Additionally, a quantitative structure-activity relationship (QSAR) model that yielded a cross-validated correlation coefficient of 0.85 effectively predicts the cytotoxicity of untested thiosemicarbazones. Together, the models serve as effective approaches for predicting structures with MDR1-selective activity and aid in directing the search for the mechanism of action of 1.
[EN] THIOSEMICARBAZONES WITH MDR1 - INVERSE ACTIVITY<br/>[FR] THIOSEMICARBAZONES À ACTIVITÉ ANTI-MDR1
申请人:US HEALTH
公开号:WO2012033601A1
公开(公告)日:2012-03-15
Disclosed herein are drug compounds that have MDR-inverse activity and thus are effective against multidrug-resistant cells. Exemplary compounds disclosed herein have the structure;Formula (I). Examples of the disclosed compounds have been found to have, inter alia, efficacy in directly treating multidrug resistant cells, rendering multidrug resistant cells susceptible to other chemotherapeutics and in some instances reversing multidrug resistance.
In this study a new series of 5-bromo-3-[(3-subtituted-5-methyl-4-thiazolidinone-2-lidene)-hydrazono]-1H-2-indolinones (3a-i) and 5-bromo-3-[(2-thioxo-3-substituted-4,5-imidazolidinedione-1-yl)imino]-1H-2-indolinones (4a-f) was synthesized by the cyclization of 5-bromo-3-(N-substituted-thiosemicarbazono)-1 H-2-indolinones (2 a-i) with ethyl 2-bromopropionate in anhydrous ethanolic medium and oxalyl cloride in anhydrous diethyl ether, respectively Six compounds chosen as prototypes were evaluated in the 3-cell line, one dose in vitro primary cytotoxicity assay. Four of them were evaluated against the full panel of 60 human tumor cell lines at a minimum of five concentrations at 10-fold dilutions. Among the compounds tested, the 4-fluorophenylthiosemicarbazone derivative 2f showed the most favorable cytotoxicity This compound demonstrated the most marked effects on a breast cancer cell line (BT-549, log(10)GI(50) value -6.40), a non small cell lung cancer cell line (NCl-H23, log(10)GI(50) value -6.10), and an ovarian cancer cell line (IGROV1, log(10)GI(50) value -6.02).