Abstract
We report that the introduction of low concentrations of intracellular trehalose can greatly improve the survival of mammalian cells during cryopreservation. Using a genetically engineered mutant of Staphylococcus aureus α-hemolysin to create pores in the cellular membrane, we were able to load trehalose into cells. Low concentrations (0.2 M) of trehalose permitted long-term post-thaw survival of more than 80% of 3T3 fibroblasts and 70% of human keratinocytes. These results indicate that simplified and widely applicable freezing protocols may be possible using sugars as intracellular cryoprotective additives.
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Acknowledgements
This work was partially supported by the National Institutes of Health grants DK46270 and NS26760, Shriners Hospitals for Children, ONR and DOE. The authors thank Xiaofeng Lu for technical assistance. The authors also acknowledge Dr. Jeffrey Morgan's assistance in keratinocyte culture and evaluation. Michael J. Russo was a Howard Hughes Medical Institute Pre-Doctoral Fellow.
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Eroglu, A., Russo, M., Bieganski, R. et al. Intracellular trehalose improves the survival of cryopreserved mammalian cells. Nat Biotechnol 18, 163–167 (2000). https://doi.org/10.1038/72608
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DOI: https://doi.org/10.1038/72608
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