Document Detail


Cryoprotectant permeability parameters for cells used in a bioengineered human corneal equivalent and applications for cryopreservation.
MedLine Citation:
PMID:  15351688     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A human corneal equivalent is being developed with applications in pharmaceutical testing and biomedical research, but the distribution of this engineered tissue, depends on successful cryopreservation. Cryopreservation of tissues depends on the presence of cryoprotectants, their addition and removal, and exposure to conditions during freezing and thawing, all of which depend on cellular membrane permeabilities to water and cryoprotectant. This study defines the permeability properties that define the rate of water and cryoprotectant movement across the plasma membrane of isolated human corneal endothelial, keratocyte, and epithelial cells. Cells were transferred from isotonic conditions (300 mosm/kg) to 0.5, 1, or 2 M dimethyl sulfoxide and propylene glycol solutions at constant temperature, and cell volumes monitored using an electronic particle counter. Histograms describing cell volume changes over time after cryoprotectant exposure allowed calculation of hydraulic conductivity (Lp), cryoprotectant permeability (Ps), and the reflection coefficient (sigma). Experimental values for Lp and Ps at 4, 13, 22, and 37 degrees C were used to determine the Arrhenius activation energy (Ea). Defining the permeability parameters and temperature dependencies allows simulation of responses of human corneal cells to addition and removal of cryoprotectants and to freezing conditions, allowing amount of supercooling, intracellular electrolyte concentration, and intracellular cryoprotectant concentration to be calculated. Simulations also show that the constituent cells in the bioengineered cornea respond differently to addition and removal of cryoprotectants and to freezing. This study has defined the requirements during cryopreservation for the corneal cells; future work will define the matrix requirements which will allow the development of a cryopreservation protocol.
Authors:
S L Ebertz; L E McGann
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  Cryobiology     Volume:  49     ISSN:  0011-2240     ISO Abbreviation:  Cryobiology     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-09-07     Completed Date:  2005-03-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0006252     Medline TA:  Cryobiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  169-80     Citation Subset:  IM    
Affiliation:
Department of Laboratory Medicine and Pathology, University of Alberta, Alta., Canada. stacy.ebertz@ualberta.net
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MeSH Terms
Descriptor/Qualifier:
Cell Membrane Permeability
Cornea* / cytology,  metabolism
Cryopreservation / methods*
Cryoprotective Agents
Humans
Kinetics
Models, Biological
Tissue Engineering
Chemical
Reg. No./Substance:
0/Cryoprotective Agents

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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