Endotoxin Metabolism Reflects Hepatic Functional Reserve in End-Stage Liver Disease

Area of Science:

• Hepatology
• Transplantation immunology
• Biomarker discovery

Background:

• Hepatic clearance of endotoxin (Et) may indicate liver function and injury.
• Investigating Et activity (EA) in relation to liver disease severity scores and liver enzymes is crucial.

Purpose of the Study:

• To examine the relationship between endotoxin activity (EA) and the Model for End-Stage Liver Disease (MELD)/Pediatric End-Stage Liver Disease (PELD) scores.
• To assess the correlation between EA and alanine transaminase (ALT) levels in the postoperative period following liver transplantation.

Main Methods:

• Eight living-donor liver transplantations (LDLTs) for biliary atresia were performed.
• Endotoxin activity (EA) was measured using an endotoxin activity assay (EAA) at various time points: pre-LDLT, intraoperative anhepatic phase, 1 hour post-reperfusion, and on postoperative days 1, 7, and 14.

Main Results:

• Endotoxin activity (EA) levels were generally low, with the lowest observed during the reperfusion period.
• A significant positive correlation was found between preoperative MELD/PELD scores and EAA (r=0.837, P=.009).
• While ALT and EA showed a general trend of direct correlation, no statistically significant relationships were observed between these two metrics at different postoperative time points.

Conclusions:

• Endotoxin metabolism serves as a reflection of hepatic functional reserve in patients with end-stage liver disease.
• The study highlights the potential of endotoxin activity as a biomarker for assessing liver function in the context of liver disease and transplantation.