title: Online biochemical detection of glutathione-S-transferase P1-specific inhibitors in complex mixtures.
abstract: A high-resolution screening (HRS) technology is described, which couples 2 parallel enzyme affinity detection (EAD) systems for substrates and inhibitors of rat cytosolic glutathione-S-transferases (cGSTs) and purified human GST P1 to gradient reversed-phase high-performance liquid chromatography (HPLC). The cGSTs and GST P1 EAD systems were optimized and validated first in flow injection analysis (FIA) mode, and optimized values were subsequently used for HPLC mode. The IC(50) values of 8 ligands thus obtained online agreed well with the IC(50) values obtained with microplate reader-based assays. For ethacrynic acid, an IC(50) value of 1.8 +/- 0.4 microM was obtained with the cGSTs EAD system in FIA mode and 0.8 +/- 0.6 microM in HPLC mode. For ethacrynic acid with the GST P1 EAD system, IC(50) values of 6.0 +/- 2.9 and 3.6 +/- 2.8 microM were obtained in FIA and HPLC modes, respectively. An HRS GST EAD system, consisting of both the cGSTs and the GST P1 EAD system in HPLC mode in parallel, was able to separate complex mixtures of compounds and to determine online their individual affinity for cGSTs and GST P1. Finally, a small library of GST inhibitors, synthesized by reaction of several electrophiles with glutathione (GSH), was successfully screened with the newly developed parallel HRS GST EAD system. It is concluded that the present online gradient HPLC-based HRS screening technology offers new perspectives for sensitive and simultaneous screening of general cGSTs and specific GST P1 inhibitors in mixtures.
authors: LACDR-Division of Molecular Toxicology, Department of Pharmacochemistry, Vrije Universiteit, Amsterdam, the Netherlands.
authors: Jeroen
authors: J
authors: Kool
authors: Mark
authors: M
authors: Eggink
authors: Huub
authors: H
authors: van Rossum
authors: Sebastiaan M
authors: SM
authors: van Liempd
authors: Danny A
authors: DA
authors: van Elswijk
authors: Hubertus
authors: H
authors: Irth
authors: Jan N M
authors: JN
authors: Commandeur
authors: John H N
authors: JH
authors: Meerman
authors: Nico P E
authors: NP
authors: Vermeulen
mesh_terms: D000818:Animals; D003600:Cytosol / Q000201:enzymology; D004305:Dose-Response Relationship, Drug; D004353:Drug Evaluation, Preclinical; D001330:Electronic Data Processing; D004791:Enzyme Inhibitors / Q000032:analysis* / Q000737:chemistry / Q000494:pharmacology*; D004976:Ethacrynic Acid; D017022:Flow Injection Analysis; D051549:Glutathione S-Transferase pi / Q000037:antagonists & inhibitors* / Q000378:metabolism; D006801:Humans; D020128:Inhibitory Concentration 50; D009862:Online Systems; D051381:Rats; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004791:Enzyme Inhibitors; D051549:Glutathione S-Transferase pi; D004976:Ethacrynic Acid