title: Hepatotoxicity assay using human hepatocytes trapped in microholes of a microfluidic device.
abstract: Hepatocytes have been used for in vitro hepatotoxicity assays because of their ability to sustain intact liver-specific functions. Here, we demonstrate a hepatotoxicity assay system using primary human hepatocytes trapped in microholes of a microfluidic device, providing a microscale in vivo liver-like environment. We performed microfluidic hepatotoxicity assays of several drugs, including acetaminophen, verapamil, diclofenac, and benzopyrene, all of which are known to specifically affect hepatic function. The drug sensitivities in hepatocytes and HepG2 cells were measured by calculating the live cell fraction at various drug concentrations. The results indicated that hepatocytes were more sensitive to these drugs than HepG2 cells. The lethal concentration 50 values for all drugs tested were similar to those from the in vitro toxicity data with human hepatocytes obtained from the literature. Furthermore, we developed a mathematical hepatotoxicity model based on the time-dependent cell death profiles measured by our device. This novel assay system enabled us to analyze in vivo-like hepatotoxicity in a microfluidic device by exploiting microstructures to mimic the microenvironment of the liver.
authors.affiliation: Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.
authors.forename: Ju Hun
authors.initials: JH
authors.lastname: Yeon
authors.forename: Dokyun
authors.initials: D
authors.lastname: Na
authors.forename: Je-Kyun
authors.initials: JK
authors.lastname: Park
mesh_terms: D001580:Benzopyrenes / Q000633:toxicity; D002469:Cell Separation / Q000295:instrumentation*; D002470:Cell Survival / Q000187:drug effects; D056486:Chemical and Drug Induced Liver Injury / Q000209:etiology / Q000473:pathology; D064420:Drug-Related Side Effects and Adverse Reactions; D004867:Equipment Design; D056945:Hep G2 Cells; D022781:Hepatocytes / Q000187:drug effects*; D006801:Humans; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation* / Q000379:methods; D008954:Models, Biological; D018675:Toxicity Tests / Q000295:instrumentation* / Q000379:methods
chemical_list: D001580:Benzopyrenes