Water moves across a cell membrane in response to differences in water chemical potential, often simplified as differences in effective solute concentration.
A changing environment
When extracellular ice forms, salts and other dissolved substances become concentrated in the liquid around a cell. Water can move out through the cell membrane, causing the cell to shrink. Some dehydration reduces the water available to form intracellular ice.
Too much movement causes stress
Extreme shrinking or swelling can damage cells. Adding and removing cryoprotective agents also changes the osmotic environment. A permeating agent and water do not necessarily cross a membrane at the same speed, so cell volume can change over time.
Why this matters
Managing volume changes matters during CPA addition, freezing, and CPA removal.
A real-world connection
After warming, abruptly diluting a cell suspension can make cells swell as water enters. Real protocols must validate the entire handling sequence.
Key vocabulary
Why can a cell shrink when ice forms outside it?
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Related research papers
These studies focus on particular cells, tissues, or organs. Their results do not apply automatically to every biological sample.
- Kinetics of Water Loss from Cells at Subzero Temperatures and the Likelihood of Intracellular Freezing ↗A foundational model connecting cooling rate, water transport, and intracellular ice.
- The haemolysis of human red blood-cells by freezing and thawing ↗Classic experiments on solute concentration and injury to red blood cells.
Other sources & further reading
- ATCC — Animal Cell Culture Guide, cryopreservation guidance ↗Technical guidance for cell cultures; individual cell types require validated conditions.