Abstract
Cells subjected to the events occurring before, during, and after freezing and thawing are exposed to major changes in the osmotic pressure of the surrounding medium; i.e., the osmolalities can exceed 30. An important question in understanding the mechanisms of injury is whether cells respond as ideal osmometers to these strongly anisotonic solutions. Mouse and bovine embryos from eight-cell to blastocyst stage were used to investigate the question. They were found to behave as ideal osmometers at room temperature over a wide range of tonicities; i.e., from four times isotonic to almost 1/3 times isotonic, ideality being defined by a Boyle-van't Hoff equation. Embryo volumes increased from 40 to 200% of isotonic over this range and survivals of mouse embryos were unaffected. However, outside this range the membrane apparently becomes leaky and the survival of mouse embryos drops sharply. Osmolalities rise to high values during freezing and the paper develops the thermodynamic equations to show how computed cell volumes as a function of subzero temperature can be translated into the Boyle-van't Hoff format of cell volume as a function of the reciprocal of osmolality.
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Mazur, P., Schneider, U. Osmotic responses of preimplantation mouse and bovine embryos and their cryobiological implications. Cell Biophysics 8, 259–285 (1986). https://doi.org/10.1007/BF02788516
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DOI: https://doi.org/10.1007/BF02788516