Heme oxygenase-1 genotype of the donor is associated with graft survival after liver transplantation.
Heme oxygenase-1 (HO-1) has been suggested as a cytoprotective gene during liver transplantation. Inducibility of HO-1 is modulated by a (GT)(n) polymorphism and a single nucleotide polymorphism (SNP) A(-413)T in the promoter. Both a short (GT)(n) allele and the A-allele have been associated with increased HO-1 promoter activity. In 308 liver transplantations, we assessed donor HO-1 genotype and correlated this with outcome variables. For (GT)(n) genotype, livers were divided into two classes: short alleles (<25 repeats; class S) and long alleles (> or =25 repeats; class L). In a subset, hepatic messenger ribonucleic acid (mRNA) expression was correlated with genotypes. Graft survival at 1 year was significantly better for A-allele genotype compared to TT-genotype (84% vs. 63%, p = 0.004). Graft loss due to primary dysfunction (PDF) occurred more frequently in TT-genotype compared to A-receivers (p = 0.03). Recipients of a liver with TT-genotype had significantly higher serum transaminases after transplantation and hepatic HO-1 mRNA levels were significantly lower compared to the A-allele livers (p = 0.03). No differences were found for any outcome variable between class S and LL-variant of the (GT)(n) polymorphism. Haplotype analysis confirmed dominance of the A(-413)T SNP over the (GT)(n) polymorphism. In conclusion, HO-1 genotype is associated with outcome after liver transplantation. These findings suggest that HO-1 mediates graft survival after liver transplantation.
Buis
C I
CI
Section of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
van der Steege
G
G
Visser
D S
DS
Nolte
I M
IM
Hepkema
B G
BG
Nijsten
M
M
Slooff
M J H
MJ
Porte
R J
RJ
D000328:Adult; D001706:Biopsy; D005260:Female; D005838:Genotype; D006085:Graft Survival / Q000502:physiology*; D051547:Heme Oxygenase-1 / Q000235:genetics*; D006801:Humans; D008099:Liver / Q000201:enzymology; D008111:Liver Function Tests; D016031:Liver Transplantation / Q000276:immunology / Q000473:pathology / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D020641:Polymorphism, Single Nucleotide; D012333:RNA, Messenger / Q000235:genetics; D014019:Tissue Donors
D012333:RNA, Messenger; C496541:HMOX1 protein, human; D051547:Heme Oxygenase-1