title: Inhibition of ice recrystallization and cryoprotective activity of wheat proteins in liver and pancreatic cells.
abstract: Efficient cryopreservation of cells at ultralow temperatures requires the use of substances that help maintain viability and metabolic functions post-thaw. We are developing new technology where plant proteins are used to substitute the commonly-used, but relatively toxic chemical dimethyl sulfoxide. Recombinant forms of four structurally diverse wheat proteins, TaIRI-2 (ice recrystallization inhibition), TaBAS1 (2-Cys peroxiredoxin), WCS120 (dehydrin), and TaENO (enolase) can efficiently cryopreserve hepatocytes and insulin-secreting INS832/13 cells. This study shows that TaIRI-2 and TaENO are internalized during the freeze-thaw process, while TaBAS1 and WCS120 remain at the extracellular level. Possible antifreeze activity of the four proteins was assessed. The "splat cooling" method for quantifying ice recrystallization inhibition activity (a property that characterizes antifreeze proteins) revealed that TaIRI-2 and TaENO are more potent than TaBAS1 and WCS120. Because of their ability to inhibit ice recrystallization, the wheat recombinant proteins TaIRI-2 and TaENO are promising candidates and could prove useful to improve cryopreservation protocols for hepatocytes and insulin-secreting cells, and possibly other cell types. TaENO does not have typical ice-binding domains, and the TargetFreeze tool did not predict an antifreeze capacity, suggesting the existence of nontypical antifreeze domains. The fact that TaBAS1 is an efficient cryoprotectant but does not show antifreeze activity indicates a different mechanism of action. The cryoprotective properties conferred by WCS120 depend on biochemical properties that remain to be determined. Overall, our results show that the proteins' efficiencies vary between cell types, and confirm that a combination of different protection mechanisms is needed to successfully cryopreserve mammalian cells.
authors.affiliation: Département Des Sciences Biologiques, Université Du Québec À Montréal, Montréal, Canada.
authors.forename: Mélanie
authors.initials: M
authors.lastname: Chow-Shi-Yée
authors.affiliation: Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Canada.
authors.forename: Jennie G
authors.initials: JG
authors.lastname: Briard
authors.affiliation: Département Des Sciences Biologiques, Université Du Québec À Montréal, Montréal, Canada.
authors.forename: Mélanie
authors.initials: M
authors.lastname: Grondin
authors.affiliation: Département Des Sciences Biologiques, Université Du Québec À Montréal, Montréal, Canada.
authors.forename: Diana A
authors.initials: DA
authors.lastname: Averill-Bates
authors.affiliation: Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Canada.
authors.forename: Robert N
authors.initials: RN
authors.lastname: Ben
authors.affiliation: Département Des Sciences Biologiques, Université Du Québec À Montréal, Montréal, Canada.
authors.forename: François
authors.initials: F
authors.lastname: Ouellet
mesh_terms: D000818:Animals; D021301:Antifreeze Proteins / Q000302:isolation & purification / Q000494:pharmacology; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D015925:Cryopreservation; D003451:Cryoprotective Agents / Q000302:isolation & purification / Q000494:pharmacology*; D004121:Dimethyl Sulfoxide / Q000009:adverse effects; D022781:Hepatocytes / Q000166:cytology* / Q000187:drug effects; D050417:Insulin-Secreting Cells / Q000166:cytology* / Q000187:drug effects; D010940:Plant Proteins / Q000302:isolation & purification / Q000494:pharmacology; D051381:Rats; D011994:Recombinant Proteins / Q000494:pharmacology; D014908:Triticum / Q000378:metabolism*
chemical_list: D021301:Antifreeze Proteins; D003451:Cryoprotective Agents; D010940:Plant Proteins; D011994:Recombinant Proteins; D004121:Dimethyl Sulfoxide
keywords: cryopreservation; ice recrystallization inhibition; mammalian cell; plant protein