beta-Glucan Reflects Liver Injury After Preservation and Transplantation in Dogs

Abstract

Graft failure and extrahepatic organ complications, which frequently develop after transplantation, may be related to inflammatory mediators stimulated by endotoxin (ET). The role of endotoxemia after liver transplantation is controversial and may depend upon differences in the ET assay method used in the various contradicting studies. While the standard Limulus amebocyte lysate (LAL) is reactive for ET and tJ-glucan, a novel turbidimetric assay method enables separate determinations of ET and tJ-glucan. Beagle dogs undergoing orthotopjc liver transplantation were divided into two groups. In Group I (n = 6) the grafts were transplanted immediately and in Group II (n = 6) grafts were preserved for 48 h in University of Wisconsin (UW) solution. Animals received cyclosporine immunosuppression and were followed for 14 days. Daily measurements of aspartate aminotransferase (AST), alanine aminotransferase (ALT), and lactate dehydrogenase (LDH) were performed. Samples for ET and tJ-glucan measurement were collected serially and processed using the turbidimetric assay method. While no graft failure was seen in Group I, three of six Group II animals died from graft failure within 1 day after transplantation. Preservation and reperfusion injury was much more severe in the Group II grafts than in Group I grafts. While endotoxemia could not be detected, postoperative tJ-glucan levels (undetectable pretransplant) were seen in both groups. tJ-Glucan levels were much higher in Group II grafts than in Group I grafts, and correlated with the severity ofliver damage. In conclusion, this study shows that tJ-glucann, instead of ET, appears during the early posttransplant period. We believe that posttransplant elevation of ~-glucan is related to liver damage, especially endothelial damage by preservation and reperfusion.