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Progressive solidification in cryopreservation yielded more viable cells initially compared to network solidification. Differences diminished over time, suggesting progressive solidification is viable for large-volume cell banking.

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Area of Science:

  • Cryobiology
  • Biopreservation
  • Cell Therapy

Background:

  • Ice formation during cryopreservation significantly affects sample viability.
  • Network solidification occurs in small volumes, while progressive solidification is seen in larger volumes.
  • Understanding these ice phase transitions is crucial for scaling up cryopreservation protocols.

Purpose of the Study:

  • To investigate the impact of network vs. progressive solidification on alginate encapsulated liver spheroids (ELS).
  • To develop an economical method for replicating these ice formation differences.
  • To assess the implications for large-volume cryo-banking and cell therapy.

Main Methods:

  • Utilized alginate encapsulated liver spheroids (ELS) as a model system.
  • Implemented a method to economically replicate distinct ice formation processes (network vs. progressive solidification).
  • Evaluated cell viability and recovery at 24, 48, and 72 hours post-thaw.

Main Results:

  • Progressive solidification led to fewer, but proportionally more viable cells at 24 hours post-thaw compared to network solidification.
  • Differences in cell viability diminished by 48 and 72 hours post-thaw as cells recovered.
  • Minor but significant differences in total viable cell recovery and function were observed between the two solidification methods.

Conclusions:

  • Progressive solidification does not appear to be a significant barrier for large-volume cryopreservation.
  • While initial viability differs, long-term recovery is comparable between network and progressive solidification.
  • Further research is needed to fully understand the subtle differences in cell recovery and function observed between the two ice formation processes.