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Hypothermic Storage and Cryopreservation of Hepatocytes: The Protective Effect of Alginate Gel Against Cell Damages

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Hepatocyte-based therapy has been proposed as an alternative to organ transplantation in the treatment of liver disorders. In the clinical context, a major issue is the constant supply of quality assurance-controlled hepatocytes, thereby requiring their cold storage in good conditions. We have analyzed the protective effects of alginate entrapment of rat hepatocytes after either 24 or 48 h of hypothermic storage or cryopreservation on the cell viability, cell yield, both mitochondrial and other cytoplasmic functional activities, and apoptosis. Decrease in viability, as evaluated by the MTT inclusion test, was 4% and 13% (24 h at 4°C), 15% and 33% (48 h at 4°C), and 9% and 19% (liquid nitrogen) for entrapped and free suspended hepatocytes, respectively. Viable cell yields were 86 ± 8% and 51 ± 6% for cryopreserved entrapped and free suspended hepatocytes, respectively. The mitochondrial (MTS assay), 7-ethoxyresorufin O-deethylase (EROD), and glutathione-S-transferase (GST) activities were better preserved in entrapped than in free suspended hepatocytes. Both hypothermic storage and cryopreservation were found to induce early caspase-3-like activities, being always much lower in entrapped hepatocytes, particularly after cryopreservation (98.4 ± 42.4 vs. 6.4 ± 4.0 fluorescence arbitrary units/hours/μg protein). Thus, cold-induced apoptosis in hepatocytes can be significantly reduced following their entrapment within alginate gel beads and this is associated with an improvement of both their viability and function.
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Keywords: Cell therapy; Cryopreservation; Hepatocytes; Hypothermia; Immobilized cells; Sodium alginate

Document Type: Research Article

Affiliations: 1: *INSERM U456, Detoxication and Tissue Repair Unit, University of Rennes I, 2 avenue Pr Léon Bernard, 35043 Rennes, France 2: †Biopredic International, 14-18 rue Jean Pecker, 35000 Rennes, France

Publication date: 2002-12-01

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  • Cell Transplantation publishes original, peer-reviewed research and review articles on the subject of cell transplantation and its application to human diseases. To ensure high-quality contributions from all areas of transplantation, separate section editors and editorial boards have been established. Articles deal with a wide range of topics including physiological, medical, preclinical, tissue engineering, and device-oriented aspects of transplantation of nervous system, endocrine, growth factor-secreting, bone marrow, epithelial, endothelial, and genetically engineered cells, among others. Basic clinical studies and immunological research papers are also featured. To provide complete coverage of this revolutionary field, Cell Transplantation will report on relevant technological advances, and ethical and regulatory considerations of cell transplants. Cell Transplantation is now an Open Access journal starting with volume 18 in 2009, and therefore there will be an inexpensive publication charge, which is dependent on the number of pages, in addition to the charge for color figures. This will allow work to be disseminated to a wider audience and also entitle the corresponding author to a free PDF, as well as prepublication of an unedited version of the manuscript.

    Cell Transplantation is now being published by SAGE. Please visit their website for the most recent issues.

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