Abstract:
:The response of cells to freezing depends critically on the presence of an intact cell membrane. During rapid cooling, the cell plasma membrane may no longer be an effective barrier to ice propagation and can be breached by extracellular ice resulting in the nucleation of the supercooled cytoplasm. In tissues, the formation of intracellular ice is compounded by the presence of cell-cell and cell-surface interactions. Three different hamster fibroblast model systems were used to simulate structures found in organized tissues. Samples were supercooled to an experimental temperature on a cryostage and ice nucleated at the constant temperature. A dual fluorescent staining technique was used for the quantitative assessment of the integrity of the cell plasma membrane. A novel technique using the fluorescent stain SYTO was used for the detection of intracellular ice formation (IIF) in cell monolayers. The cumulative incidence of cells with a loss of membrane integrity and the cumulative incidence of IIF were determined as a function of temperature. Cells in suspension and individual attached cells showed no significant difference in the number of cells that formed intracellular ice and those that lost membrane integrity. For cells in a monolayer, with cell-cell contact, intracellular ice formation did not result in the immediate disruption of the plasma membrane in the majority of cells. This introduces the potential for minimizing damage due to IIF and for developing strategies for the cryoprotection of tissues during rapid cooling.
journal_name
Cryobiologyjournal_title
Cryobiologyauthors
Acker JP,McGann LEdoi
10.1006/cryo.1999.2221subject
Has Abstractpub_date
2000-02-01 00:00:00pages
54-63issue
1eissn
0011-2240issn
1090-2392pii
S0011-2240(99)92221-6journal_volume
40pub_type
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