Document Detail

Green fluorescent protein: A novel viability assay for cryobiological applications.
MedLine Citation:
PMID:  10924267     Owner:  NLM     Status:  MEDLINE    
Assessment of tissue viability following the application of a freezing protocol is challenging due to the paucity of viability assays that can be used dynamically, in situ. Cells transfected with a green fluorescent protein (GFP) vector actively produce GFP, which is retained intracellularly. Because of its constitutive and heritable expression, GFP fluorescence of transfected cells may have significant utility as a viability assay for cells within tissues. As a first step toward application to tissues, this work seeks to establish the validity of this GFP-based assay in cell suspensions by comparing the results to other accepted measures of viability. To the authors' knowledge, this is the first use of GFP in cryobiology applications. Intracellular GFP fluorescence was evaluated following slow freezing. Nontransfected and GFP-transfected rat 3230 adenocarcinoma (R3230AC) cells were frozen at 1 degrees C/min to minimum temperatures between -5 and -30 degrees C and then immediately thawed in a 37 degrees C water bath. Samples were assayed using the common viability indicators trypan blue and ethidium bromide (EtBr). A regression analysis of recovery measured with the GFP assay as a function of recovery measured with a trypan blue assay gave a correlation coefficient of 0.97. A similar correlation coefficient, 0.95, was determined for recovery assessed by the GFP assay as a function of recovery measured by an EtBr assay. Nontransfected and GFP-transfected cells responded similarly to slow freezing, indicating that GFP transfection did not significantly alter the response of cells to typical freezing conditions. The excellent correlation of GFP assay results with those of two common viability assays suggests that the GFP-based assay is valid for cells and that further development of a tissue viability assay based on transfection is appropriate.
G Elliott; J McGrath; E Crockett-Torabi
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Cryobiology     Volume:  40     ISSN:  0011-2240     ISO Abbreviation:  Cryobiology     Publication Date:  2000 Jun 
Date Detail:
Created Date:  2000-10-06     Completed Date:  2000-10-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0006252     Medline TA:  Cryobiology     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  360-9     Citation Subset:  IM    
Copyright Information:
Copyright 2000 Academic Press.
Department of Mechanical Engineering, Michigan State University, East Lansing, Michigan, 48824, USA.
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MeSH Terms
Cell Line
Cell Survival
Green Fluorescent Proteins
Luminescent Proteins / genetics,  metabolism*
Recombinant Proteins / genetics,  metabolism
Reg. No./Substance:
0/Luminescent Proteins; 0/Recombinant Proteins; 147336-22-9/Green Fluorescent Proteins

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