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Bulk Droplet Vitrification for Primary Hepatocyte Preservation
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Droplet based vitrification for cell aggregates: Numerical analysis.

Meng Shi1, Shangsheng Feng2, Xiaohui Zhang3

  • 1School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China; Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, Xi'an 710049, PR China.

Journal of the Mechanical Behavior of Biomedical Materials
|April 16, 2018
PubMed
Summary
This summary is machine-generated.

Droplet-based vitrification offers advantages for cell aggregate cryopreservation. A new model reveals cell membranes impact cryoprotectant diffusion, crucial for preventing crystallization and toxicity during preservation.

Keywords:
Cell aggregatesCell membraneSimulationVitrification

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Area of Science:

  • Biotechnology
  • Cell Biology
  • Cryobiology

Background:

  • Cell aggregates are vital in vivo and as in vitro models.
  • Preserving cell aggregate functionality for off-the-shelf use remains a challenge.
  • Droplet-based vitrification shows promise for cell aggregate cryopreservation, but underlying mechanisms are unclear.

Purpose of the Study:

  • To elucidate the physical mechanisms of droplet-based vitrification for cell aggregates.
  • To model cryoprotectant (CPA) diffusion, heat transfer, and crystallization during vitrification.
  • To investigate the role of cell membranes in CPA diffusion and subsequent crystallization.

Main Methods:

  • Developed a Voronoi model for cell aggregate morphology.
  • Established a coupled physical model for diffusion, heat transfer, and crystallization.
  • Performed numerical simulations of CPA concentration, temperature, and crystallization distribution.

Main Results:

  • Cell membranes significantly influence CPA diffusion, acting as a biological film.
  • Heat transfer is minimally affected by the cell membrane.
  • Effective CPA protection occurs early in diffusion; prolonged exposure increases toxicity without necessarily reducing crystallization.

Conclusions:

  • Cell membrane properties are critical for understanding CPA diffusion and vitrification outcomes.
  • Optimizing CPA loading time is essential to balance cryoprotection and minimize cell toxicity.
  • This study provides a physical basis for improving cell aggregate cryopreservation techniques.