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• W2005025207 abstract "Since oxygen is one of the critical limiting factors for maintaining cell viability and function, a great deal of effort is being focused on improving the oxygen supply to three-dimensional (3D) cellular constructs. Here, we report a technique to construct spheroids utilizing 3D culture chips with a rapid and simple method for the replication of the surface structures of a polydimethylsiloxane (PDMS) mold. The resultant spheroid culture chip made it possible to rapidly yield high numbers of the spheroids at a time as well as to obtain uniform spheroids with a narrow size distribution and to collect the spheroids easily and noninvasively. The most important feature of this spheroid culture chip is that it enables direct oxygen supply to the cells because the chip is made with only gas-permeable PDMS. When human hepatoma HepG2 cells were grown on the oxygen-permeable chips as a model for liver cells, the cellular growth was remarkably enhanced, and the anaerobic glycolysis was significantly reduced compared to the non-oxygen-permeable chips. Furthermore, the oxygen-permeable chip improved the albumin secretion rates compared to the conventional spheroid culture system after 10 days. Histochemical and immunohistochemical analyses demonstrated that the oxygen-permeable chip dramatically prevented hypoxia in the core of the spheroids and subsequent central necrosis. Surprisingly, the diameters of approximately 400 and 600 μm were estimated to be the threshold of the hypoxic and survival size, respectively, for the HepG2 spheroids in the oxygenated chip. These results indicate that this chip is useful for engineering 3D cellular constructs with high viability and functionality for tissue engineering." @default.
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• W2005025207 date "2012-11-01" @default.
• W2005025207 modified "2023-10-11" @default.
• W2005025207 title "An oxygen-permeable spheroid culture system for the prevention of central hypoxia and necrosis of spheroids" @default.
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• W2005025207 doi "https://doi.org/10.1016/j.biomaterials.2012.08.040" @default.
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