Design and Synthesis of Human ABCB1 (P-Glycoprotein) Inhibitors by Peptide Coupling of Diverse Chemical Scaffolds on Carboxyl and Amino Termini of (<i>S</i>)-Valine-Derived Thiazole Amino Acid
作者:Satyakam Singh、Nagarajan Rajendra Prasad、Eduardo E. Chufan、Bhargav A. Patel、Yi-Jun Wang、Zhe-Sheng Chen、Suresh V. Ambudkar、Tanaji T. Talele
DOI:10.1021/jm401966m
日期:2014.5.22
P-glycoprotein (P-gp) serves as a therapeutic target for the development of multidrug resistance reversal agents. In this study, we synthesized 21 novel compounds by peptide coupling at corresponding carboxyl and amino termini of (S)-valine-based bis-thiazole and monothiazole derivatives with diverse chemical scaffolds. Using calcein-AM efflux assay, we identified compound 28 (IC50 = 1.0 mu M) carrying 3,4,5-trimethoxybenzoyl and 2-aminobenzophenone groups, respectively, at the amino and carboxyl termini of the monothiazole zwitter-ion. Compound 28 inhibited the photolabeling of P-gp with [I-125]-iodoarylazidoprazosin with IC50 = 0.75 mu M and stimulated the basal ATP hydrolysis of P-gp in a concentration-dependent manner (EC50 ATPase = 0.027 mu M). Compound 28 at 3 mu M reduced resistance in cytotoxicity assay to paclitaxel in P-gp-expressing SW620/Ad300 and HEK/ABCB1 cell lines. Biochemical and docking studies showed site-1 to be the preferable binding site for 28 within the drug-binding pocket of human P-gp.