Platelets induce sinusoidal endothelial cell apoptosis upon reperfusion of the cold ischemic rat liver.

Published

Journal Article

BACKGROUND & AIMS: Sinusoidal endothelial cell (SEC) apoptosis is a central feature of reperfusion injury in liver transplantation. Platelet sequestration occurs after transplantation with possible deleterious effects. We tested the hypothesis that platelets mediate SEC apoptosis. METHODS: Livers were perfused after 24 hours of cold preservation in University of Wisconsin solution in an isolated perfused rat liver model. The perfusate contained isolated syngeneic red blood cells and purified platelets. Effects of inhibiting platelet adhesion on SEC apoptosis was tested using sialyl Lewis-X oligosaccharide (sLe(x)), a natural ligand of selectin adhesion molecules. Reperfusion injury was assessed by established markers of injury. Apoptosis was determined by TUNEL and electron microscopy. RESULTS: A third of the circulating platelets was rapidly sequestered in the liver after reperfusion. This was associated with increased graft injury. Single platelets were adherent to sinusoidal lining without morphological or dynamic evidence of impairment of microcirculation. TUNEL staining revealed a 6-fold increase in the number of apoptotic SECs at 1 hour of reperfusion. No hepatocyte death or evidence of necrosis was detected up to 3 hours of reperfusion. Addition of sLe(x) inhibited adhesion and significantly reduced SEC apoptosis. CONCLUSIONS: Platelets cause SEC apoptosis upon reperfusion of liver grafts. Prevention of adhesion is protective.

Full Text

Duke Authors

Cited Authors

  • Sindram, D; Porte, RJ; Hoffman, MR; Bentley, RC; Clavien, PA

Published Date

  • January 2000

Published In

Volume / Issue

  • 118 / 1

Start / End Page

  • 183 - 191

PubMed ID

  • 10611167

Pubmed Central ID

  • 10611167

International Standard Serial Number (ISSN)

  • 0016-5085

Language

  • eng

Conference Location

  • United States