Rapid LC-MS drug metabolite profiling using microsomal enzyme bioreactors in a parallel processing format.

Area of Science:

• Biotechnology
• Drug Metabolism
• Nanotechnology

Background:

• Traditional drug metabolism studies are time-consuming.
• Enzyme accessibility can limit reaction rates in conventional assays.

Purpose of the Study:

• To develop a high-throughput drug metabolism profiling method using silica nanoparticle bioreactors.
• To investigate drug metabolism pathways and enzyme kinetics.
• To assess drug-drug interactions.

Main Methods:

• Utilized silica nanoparticle bioreactors with enzyme/polyion thin films in a 96-well plate format.
• Investigated metabolism of diclofenac, troglitazone, and raloxifene.
• Employed human liver microsomes, rat liver microsomes, and bicistronic human-cytochrome P450 3A4 microsomes.

Main Results:

• Observed known metabolic oxidation and bioconjugation pathways and turnover rates for tested drugs.
• Achieved 2-3 fold higher enzyme turnover rates compared to conventional microsomal dispersions.
• Demonstrated applicability for studying drug-drug interactions using ketoconazole and quinidine.

Conclusions:

• Silica nanoparticle bioreactors offer a rapid and efficient platform for drug metabolism and interaction studies.
• The high-throughput format simplifies sample preparation and enables simultaneous processing.
• Improved enzyme accessibility in bioreactors leads to enhanced turnover rates.