Metabolism Studies In Vitro and In Vivo

In vitro studies empower researchers to navigate the complexities of drug metabolism. These invaluable tools guide lead optimization, predict in vivo behavior, and pave the way for safer and more efficacious drug development. Continued advancements in these models and technologies hold immense promise for further refining the efficiency and accuracy of drug development processes. In vitro biotransformation assays serve as indispensable tools, offering controlled and efficient environments to predict drug behavior prior clinical trials. This chapter gives an overview to the landscape of key in vitro models employed to elucidate drug metabolism. Microsomal fractions: These purified systems isolate drug-metabolizing enzymes, primarily the cytochrome P450 (CYP) superfamily, enabling targeted examination of specific metabolic pathways. Hepatocytes: Primary or cultured liver cells provide a more holistic metabolic profile, encompassing diverse enzymes and transporters present in the intact cell. Three-dimensional (3D) hepatocyte cultures: Mimicking the innate physiological milieu of the liver, these sophisticated models enhance the accuracy of in vivo drug metabolism prediction. Complementary systems: Perfused organs, tissue slices, and blood-based assays offer additional data and insights. The chapter also delves into the pivotal role of CYP enzymes, as major contributors to drug metabolism. It dissects the two principal phases of this process: The chapter underscores the vital consideration of these factors during drug discovery and development.