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Bulk Droplet Vitrification for Primary Hepatocyte Preservation
Published on: October 25, 2019
Vitrification successfully preserves hepatocyte spheroids
R Magalhães1, X W Wang, S S Gouk
1Low Temperature Preservation Unit, National University Medical Institutes Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
Cell Transplantation
|December 3, 2008
Summary
Vitrification using ethylene glycol and sucrose effectively preserves hepatocyte spheroids without ice crystal formation. This ice-free cryopreservation method maintains cell viability and metabolic functions, offering a promising platform for cell transplantation.
Area of Science:
- Biotechnology
- Cryobiology
- Regenerative Medicine
Background:
- Low-temperature preservation of cell aggregates is crucial for various biomedical applications.
- Traditional freezing methods can cause ice crystal damage, compromising cell integrity and function.
- Vitrification offers an ice-free cryopreservation alternative, but its efficacy for self-assembled cell aggregates requires optimization.
Purpose of the Study:
- To develop and evaluate an effective vitrification protocol for hepatocyte spheroids.
- To assess the impact of different vitrification solutions on spheroid viability and function post-cryopreservation.
- To determine the role of sucrose as a cryoprotectant in preserving self-assembled cell aggregates.
Main Methods:
- Developed a rapid, stepwise cryoprotectant exposure protocol at room temperature followed by direct immersion in liquid nitrogen.
- Formulated and tested three vitrification solutions (VS): ethylene glycol (EG)-sucrose, EG-sucrose with 1,2-propanediol (PD), and EG-PD without sucrose.
- Evaluated spheroid viability, integrity (confocal and scanning electron microscopy), and metabolic functions (urea production, albumin secretion) post-thawing.
Main Results:
- The EG-sucrose VS demonstrated excellent preservation, maintaining high cell viability and spheroid integrity compared to controls.
- Metabolic functions (albumin secretion and urea production) of EG-sucrose VS-cryopreserved spheroids were comparable to fresh controls.
- Inclusion of PD did not improve preservation, and exclusion of sucrose resulted in poor cryoprotection, highlighting sucrose's critical role.
Conclusions:
- Vitrification using an EG-sucrose solution is a highly effective method for ice-free cryopreservation of hepatocyte spheroids.
- This developed vitrification strategy preserves cell viability and key metabolic functions, making it suitable for cell transplantation applications.
- The study underscores the importance of sucrose in achieving successful vitrification of self-assembled cell aggregates.
