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- W2546455205 abstract "Fibroblasts take up trehalose during freezing and thawing, which facilitates cryosurvival of the cells. The aim of this study was to investigate if trehalose uptake via fluid‐phase endocytosis prefreeze increases cryosurvival. To determine endocytic trehalose uptake in attached as well as suspended fibroblasts, intracellular trehalose concentrations were determined during incubation at 37°C using an enzymatically based trehalose assay. In addition, freezing‐induced trehalose uptake of extracellularly added trehalose was determined. Cryosurvival rates were determined via trypan blue staining. Intracellular trehalose contents of attached as well as suspended cells were found to increase linearly with time, consistent with fluid‐phase endocytosis. Furthermore, the intracellular trehalose concentration increased with increasing extracellular trehalose concentration (0–100 mM) in a linear fashion. Prefreeze loading of cells with trehalose via fluid‐phase endocytosis only showed increased cryosurvival rates at extracellular trehalose concentrations lower than 50 mM in the cryopreservation medium. To obtain satisfactory cryosurvival rates after endocytic preloading, extracellular trehalose is needed to prevent efflux of trehalose during freezing and thawing and for freezing‐induced trehalose uptake. At trehalose concentrations greater than 100 mM, cryosurvival rates were similar or slightly higher if cells were not loaded with trehalose prefreeze. Cells that were grown in the presence of trehalose showed a tendency to aggregate after harvesting. It is concluded that it is particularly freezing‐induced trehalose uptake that facilitates cryosurvival when trehalose is used as the sole cryoprotectant for cryopreservation of fibroblasts. Preloading with trehalose does not increase cryosurvival rates if trehalose is also added as extracellular protectant. © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 33:229–230, 2017" @default.
- W2546455205 created "2016-11-11" @default.
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- W2546455205 date "2016-11-21" @default.
- W2546455205 modified "2023-10-15" @default.
- W2546455205 title "Combining endocytic and freezing-induced trehalose uptake for cryopreservation of mammalian cells" @default.
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- W2546455205 doi "https://doi.org/10.1002/btpr.2399" @default.
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