Hypothermic oxygenated perfusion (HOPE) with defatting cocktail further improves steatotic liver grafts in a transplantation rat model.

BACKGROUND In this study, we evaluated the restoring and defatting effect of hypothermic oxygenated perfusion (HOPE) on severe steatotic liver grafts with a defatting cocktail (DF) in a rat model. METHODS Severe (≥60%) hepatic macrosteatosis was induced by a high-fat diet (HFD) for six weeks, after which the rats were randomly divided into four following groups: Control group, with lean livers being preserved in static cold storage (SCS) at 0-4℃ for 45 min; SCS group, with a steatotic liver graft (SLG) being preserved in SCS at 0-4℃ for 4 hours; HOPE group, where SLG was perfused with 3-h HOPE followed by 1-h SCS; HOPE+DF group, HOPE with the addition of DF. Graft function after orthotopic liver transplantation was assessed in terms of mitochondrial function (ATP, Glycogen), endoplasmic reticulum stress (PPY, GRP78, CHOP, and ATF-6), cell apoptosis (Tunel assay, Caspase-3), inflammatory level (HMGB1, TLR4, IL-1β, IL-6. TNF-α, Factor V), and post-transplantation survival. RESULTS HOPE protected steatotic liver grafts from microcirculation disturbance and endoplasmic reticulum stress and then promoted ATP and glycogen synthesis that improved mitochondrial function. Meanwhile, under conditions of ischemia-reperfusion injury, it prevented nuclear injury and endothelial damage by suppressing the release of an inflammatory mediator. The high efficacy of HOPE was enhanced after the addition of the defatting cocktail. CONCLUSION Defatting cocktail agents cannot promote the lipid decomposition of the steatotic liver graft at 0-4℃, but they can further improve steatotic liver and postoperative survival compared to the HOPE. The defatted steatotic liver grafts can be safely used in rat orthotopic liver transplantation.