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  • Title: Microvalve-assisted patterning platform for measuring cellular dynamics based on 3D cell culture.
    Author: Kim MS, Lee W, Kim YC, Park JK.
    Journal: Biotechnol Bioeng; 2008 Dec 01; 101(5):1005-13. PubMed ID: 18942775.
    Abstract:
    A microfluidic platform to satisfy both 3D cell culture and cell-based assay is required for credible assay results and improved assay concept in drug discovery. In this article, we demonstrate a microvalve-assisted patterning (MAP) platform to provide a new method for investigating cellular dynamics by generating a linear concentration gradient of a drug as well as to realize 3D cell culture in a microenvironment. The MAP platform was fabricated by multilayer soft lithography and several microvalves made it possible to pattern a cell-matrix (scaffold) and to exchange media solutions without breaking cell-matrix structure in a microchannel. This approach provides not only exact fluids control, bubble removal, and stable solution exchange in a microchannel, but also reliable scaffold fabrication and 3D cell culture. In this study, hepatotoxicity tests with human hepatocellular liver carcinoma cells (HepG2) were also performed in real-time monitoring where cell morphologies exposed to different drug concentrations were observed at a time. Compared to 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay, the MAP platform could be used to reduce drug amount and assay time for cell-based assays as much as 10 and 3 times, respectively.
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