Pless-Petig 2018 Cell Transplant

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Pless-Petig G, Walter B, Bienholz A, Rauen U (2018) Mitochondrial impairment as a key factor for the lack of attachment after cold storage of hepatocyte suspensions. Cell Transplant 26:1855-67.

» PMID: 29390882 Open Access

Pless-Petig G, Walter B, Bienholz A, Rauen U (2018) Cell Transplant

Abstract: Isolated primary hepatocytes, which are widely used for pharmacological and clinical purposes, usually undergo certain periods of cold storage in suspension during processing. While adherent hepatocytes were shown previously to suffer iron-dependent cell death during cold (4 °C) storage and early rewarming, we previously found little iron-dependent hepatocyte death in suspension but severely decreased attachment ability unless iron chelators were added. Here, we focus on the role of mitochondrial impairment in this nonattachment of hepatocyte suspensions. Rat hepatocyte suspensions were stored in a chloride-poor, glycine-containing cold storage solution with and without iron chelators at 4 °C. After 1 wk of cold storage in the basic cold storage solution, cell viability in suspension was unchanged, while cell attachment was decreased by >80%. In the stored cells, a loss of mitochondrial membrane potential (MMP), a decrease in adenosine triphosphate (ATP) content (2 ± 2 nmol/106 cells after cold storage, 5 ± 3 nmol/106 cells after rewarming vs. control 29 ± 6 nmol/106 cells), and a decrease in oxygen consumption (101 ± 59 pmol sec-1 per 106 cells after rewarming vs. control 232 ± 83 pmol sec-1 per 106 cells) were observed. Addition of iron chelators to the cold storage solution increased cell attachment to 53% ± 20% and protected against loss of MMP, and cells were able to partially regenerate ATP during rewarming (15 ± 10 nmol/106 cells). Increased attachment could also be achieved by addition of the inhibitor combination of mitochondrial permeability transition, trifluoperazine + fructose. Attached hepatocytes displayed normal MMP and mitochondrial morphology. Additional experiments with freshly isolated hepatocytes confirmed that impaired energy production-as elicited by an inhibitor of the respiratory chain, antimycin A-can decrease cell attachment without decreasing viability. Taken together, these results suggest that mitochondrial impairment with subsequent energy deficiency is a key factor for the lack of attachment of cold-stored hepatocyte suspensions.

Keywords: Attachment, Cold storage, Hepatocytes, Iron ions, Mitochondria Bioblast editor: Kandolf G O2k-Network Lab: DE Essen Bienholz A

Labels: MiParea: Respiration 

Stress:Temperature  Organism: Rat  Tissue;cell: Liver  Preparation: Intact cells 

Pathway: ROX  HRR: Oxygraph-2k 

Labels, 2018-03