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Updated: Jun 17, 2026
Technique of Subnormothermic Ex Vivo Liver Perfusion for the Storage, Assessment, and Repair of Marginal Liver Grafts
Published on: August 13, 2014
Static Cold Storage and Machine Perfusion: Redefining the Role of Preservation and Perfusate Solutions.
Arnau Panisello-Rosello1,2, Teresa Carbonell2, Joan Rosello-Catafau3
1Translational Research and Innovation in General and Digestive Surgery (GITIC), Department of General and Digestive Surgery, La Paz University Hospital-IdiPAZ, Paseo de la Castellana 261, 28046 Madrid, Spain.
Polyethylene Glycol 35 (PEG35) solutions enhance static cold storage (SCS) by activating cytoprotective pathways. Combining PEG35-SCS with hypothermic oxygenated perfusion (HOPE) improves preservation for vulnerable liver grafts.
Area of Science:
- Transplantation immunology
- Organ preservation techniques
- Biomedical engineering
Background:
- Static cold storage (SCS) is the standard for liver graft preservation, but limitations exist for vulnerable organs.
- Dynamic perfusion techniques like hypothermic oxygenated perfusion (HOPE) have emerged but face challenges with marginal grafts.
- Ischemia-reperfusion injury remains a significant concern in liver transplantation.
Purpose of the Study:
- To review the cytoprotective mechanisms of Polyethylene Glycol 35 (PEG35)-based solutions during SCS.
- To explore the synergistic effects of PEG35-mediated SCS and HOPE for enhanced liver graft preservation.
- To highlight future directions in developing unified perfusion solutions for solid organ transplantation.
Main Methods:
- Review of literature on liver graft preservation solutions and dynamic perfusion techniques.
- Analysis of molecular pathways activated by PEG35, including AMP-activated protein kinase (AMPK), nitric oxide (NO), and Nrf2.
- Evaluation of PEG35's impact on perfusate properties and microcirculation during dynamic perfusion.
Main Results:
- PEG35 activates AMPK, NO production, and Nrf2, providing preconditioning during SCS.
- Synergy between PEG35-SCS and HOPE preserves mitochondrial function, endothelial glycocalyx, and microvascular homeostasis.
- PEG35 reduces perfusate viscosity, mitigating shear stress and microcirculatory damage during perfusion.
Conclusions:
- Combining PEG35-mediated SCS with HOPE offers a promising strategy for preserving vulnerable liver grafts, especially fatty livers.
- This integrated approach enhances protection against ischemia-reperfusion injury.
- Future research focuses on unified perfusion solutions for improved transplant outcomes across solid organs.
