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Quantitative light microscopy of combined perfusion and freezing processes
1MRC Medical Cryobiology Group, University Department of Surgery, Cambridge, U.K.
Journal of Microscopy
|February 1, 1991
Summary
A new microscope stage allows continuous observation of tissues during cryopreservation. This system measures cell osmotic behavior and membrane permeability for improved cryoprotective agent protocols.
Area of Science:
- Biophysics
- Cryobiology
- Tissue Engineering
Background:
- Effective cryopreservation of living tissues requires understanding mass transport dynamics.
- Current methods lack continuous observation capabilities during critical protocol steps.
Purpose of the Study:
- To develop and validate a novel microscope stage for real-time monitoring of specimens during cryopreservation.
- To investigate the osmotic behavior and membrane permeability of cells using dimethyl sulfoxide (DMSO).
Main Methods:
- A sealed chamber microscope stage with rapid perfusate exchange (1-5s time constant).
- Convection cryomicroscopy for temperature control (-100°C to 50°C).
- Video microscopy and computer vision for quantifying specimen size changes.
Main Results:
- Demonstrated real-time measurement of osmotic responses in rat pancreas islets to DMSO.
- Enabled simultaneous control of temperature and chemical composition for precise protocol imposition.
- Quantified temporal changes in specimen size to infer membrane permeability.
Conclusions:
- The developed system facilitates detailed analysis of cell responses to cryopreservation protocols.
- Provides critical data for optimizing cryoprotective agent (CPA) addition and removal strategies.
- Enhances the rational design of cryopreservation methods for living tissues.