The multifactorial nature of chemotherapy failure in controlling cancer is often associated with the occurrence of multidrug resistance (MDR), a phenomenon likely related to the increased expression of members of the ATP binding cassette (ABC) transporter superfamily. In this respect, the most extensively characterized MDR transporters include ABCB1 (also known as MDR1 or P-glycoprotein) and ABCC1 (also known as MRP1) whose inhibition remains a priority to circumvent drug resistance. Herein, we report how the simple galloyl benzamide scaffold can be easily and properly decorated for the preparation of either MRP1 or P-gp highly selective inhibitors. In particular, some gallamides and pyrogallol-l-monomethyl ethers showed remarkable affinity and selectivity toward MRP1. On the other hand, trimethyl ether galloyl anilides, with few exceptions, exhibited moderate to very high and selective P-gp inhibition.
Solvent-dependent supramolecular assemblies of π-conjugated anion-responsive acyclic oligopyrroles
作者:Hiromitsu Maeda、Yoshitaka Terashima
DOI:10.1039/c1cc12827b
日期:——
Amide-attached pyrrole-based Ï-conjugated anion receptors showed solvent-dependent assembled modes such as H-aggregates that were soluble in octane and highly organized structures that provided supramolecular gels in CH2Cl2 and 1,4-dioxane in the absence of ÏâÏ stacking.
Design, synthesis, biological evaluation, NMR and DFT studies of structurally simplified trimethoxy benzamides as selective P-glycoprotein inhibitors: the role of molecular flatness
element for tuning P‐gp inhibitory activity. In this study, we designed new structurallysimplified trimethoxy benzamides (5–17, Table 1) with the aim to uncover the minimal molecular requirements needed for P‐gp inhibition. The new prepared smaller‐sized compounds exhibited IC50 in the low micromolar range. The combined use of NMR and DFT studies suggested that molecular flatness is causatively related