Improved oxygen supply to multicellular spheroids using a gas-permeable plate and embedded hydrogel beads

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Abstract

Culture systems for three-dimensional tissues, such as multicellular spheroids, are indispensable for high-throughput screening of primary or patient-derived xenograft (PDX)-expanded cancer tissues. Oxygen supply to the center of such spheroids is particularly critical for maintaining cellular functions as well as avoiding the development of a necrotic core. In this study, we evaluated two methods to enhance oxygen supply: (1) using a culture plate with a gas-permeable polydimethylsiloxane (PDMS) membrane on the bottom, and; (2) embedding hydrogel beads in the spheroids. Culturing spheroids onPDMSincreased cell growth and affected glucose/lactate metabolism andCYP3A4mRNAexpression and subsequent enzyme activity. The spheroids, comprised of 5000Hep G2 cells and 5000 20 m-diameter hydrogel beads, did not develop a necrotic core for nine days when cultured on a gas-permeable sheet. In contrast, central necrosis in spheroids lacking hydrogel beads was observed after day 3 of culture, even when using PDMS. These results indicate that the combination of gas-permeable culture equipment and embedded hydrogel beads improves culture 3D spheroids produced from primary or PDX-expanded tumor cells.

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Mihara, H., Kugawa, M., Sayo, K., Tao, F., Shinohara, M., Nishikawa, M., … Kojima, N. (2019). Improved oxygen supply to multicellular spheroids using a gas-permeable plate and embedded hydrogel beads. Cells, 8(6). https://doi.org/10.3390/cells8060525

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