Document Detail

Cryopreservation of keratinocytes in a monolayer.
MedLine Citation:
PMID:  10529309     Owner:  NLM     Status:  MEDLINE    
The cryopreservation of cells in tissues is one of the major challenges in current cryobiology, especially with regard to the progressively increasing field of tissue engineering. It is very questionable whether protocols which were developed for the cryopreservation of isolated cells are also applicable for cells in more complex structures, such as tissues. As a starting point toward cryopreservation of these three-dimensional structures, the aim of this study was to find an optimum cryopreservation protocol for keratinocytes in a monolayer (two-dimensional structure). These epidermal cells can be transplanted as a monolayer grown on an appropriate matrix for the treatment of deep-dermal burns and leg ulcers. The successful cryopreservation of such transplants would offer the advantage of long-term storage and immediate availability of the transplant. In our study, the variables investigated were the cryoprotective solution and the cooling rate. In order to find a nontoxic cryoprotective agent (CPA) which could be transplanted without an additional washing step, we included hydroxyethyl starch (HES) as a possible CPA in our experimental protocol with the commonly used CPAs Me(2)SO, glycerol, and ethylene glycol. For the evaluation, the cell survival rate was determined by dye exclusion (trypan blue) and the cell metabolism was investigated by cell activity assay (alamarBlue). In conclusion, the cryopreservation protocol with 10 wt.-% HES resulted not only in the highest survival rate (72%) but also in the highest metabolic activity of the cells after thawing; comparable values for the other CPAs were: Me(2)SO, 48%; glycerol, 8%; and ethylene glycol, 10%.
J Pasch; A Schiefer; I Heschel; G Rau
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Cryobiology     Volume:  39     ISSN:  0011-2240     ISO Abbreviation:  Cryobiology     Publication Date:  1999 Sep 
Date Detail:
Created Date:  1999-12-10     Completed Date:  1999-12-10     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0006252     Medline TA:  Cryobiology     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  158-68     Citation Subset:  IM    
Copyright Information:
Copyright 1999 Academic Press.
Helmholtz-Institute for Biomedical Engineering, Aachen University of Technology (RWTH), Pauwelsstrasse 20, Aachen, D-52074, Germany.
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MeSH Terms
Cell Survival
Cells, Cultured
Coloring Agents
Cryopreservation / instrumentation,  methods*
Cryoprotective Agents
Evaluation Studies as Topic
Keratinocytes* / cytology,  metabolism
Reg. No./Substance:
0/Coloring Agents; 0/Cryoprotective Agents; 0/Oxazines; 0/Xanthenes; 550-82-3/resazurin; EC

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