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|Title:||Kinetics of cell death of frozen-thawed human embryonic stem cell colonies is reversibly slowed down by exposure to low temperature|
|Authors:||Heng, B.C. |
|Source:||Heng, B.C., Ye, C.P., Liu, H., Toh, W.S., Rufaihah, A.J., Cao, T. (2006-11). Kinetics of cell death of frozen-thawed human embryonic stem cell colonies is reversibly slowed down by exposure to low temperature. Zygote 14 (4) : 341-348. ScholarBank@NUS Repository. https://doi.org/10.1017/S0967199406003893|
|Abstract:||A major challenge in the widespread application of hES (human embryonic stem) cells in clinical therapy and basic scientific research is the development of efficient cryopreservation protocols. Conventional slow-cooling protocols utilizing standard cryoprotectant concentrations i.e. 10% (v/v) DMSO, yield extremely low survival rates of less than 5% as reported by previous studies. This study characterized cell death in frozen-thawed hES colonies that were cryopreserved under standard conditions. Surprisingly, our results showed that immediately after post-thaw washing, the overwhelming majority of hES cells were viable (approximately 98%), as assessed by the trypan blue exclusion test. However, when the freshly thawed hES colonies were placed in a 37°C incubator, there was a gradual reduction in cell viability over time. The kinetics of cell death was drastically slowed down by keeping the freshly thawed hES colonies at 4°C, with more than 90% of cells remaining viable after 90 min of incubation at 4°C. This effect was reversible upon re-exposing the cells to physiological temperatures. The vast majority of low temperature-exposed hES colonies gradually underwent cell death upon incubation for a further 90 min at 37°C. Hence, our observations would strongly suggest involvement of a self-induced apoptotic mechanism, as opposed to cellular necrosis arising from cryoinjury. © 2006 Cambridge University Press.|
|Appears in Collections:||Staff Publications|
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