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Liver transplantation and hepatic sinusoidal cells
Journal of Gastroenterology and Hepatology
|January 1, 1995
Summary
Liver graft non-function after transplantation is often due to microcirculatory issues. Kupffer cells and endothelial cells interact during cold preservation and reperfusion, causing damage. Blocking Kupffer cells or targeting TNF-alpha and ICAM-1 can protect the graft.
Area of Science:
- Hepatology
- Transplantation Immunology
- Vascular Biology
Background:
- Primary graft non-function is a major cause of liver retransplantation.
- The exact mechanisms underlying primary graft non-function are not fully understood.
- Microcirculatory disturbances, particularly sinusoidal damage, are implicated in graft dysfunction following cold preservation and reperfusion.
Purpose of the Study:
- To investigate the role of sinusoidal endothelial cells and Kupffer cells (KC) in cold preservation/reperfusion injury of liver grafts.
- To elucidate the cellular and molecular interactions contributing to sinusoidal damage.
- To evaluate potential therapeutic strategies targeting these pathways.
Main Methods:
- Examined Kupffer cell activation and sinusoidal endothelial cell damage during cold preservation and reperfusion.
- Assessed the production of tumor necrosis factor-alpha (TNF-alpha) by activated KC.
- Investigated the expression of ICAM-1 on sinusoidal endothelial cells.
- Evaluated the effects of KC blockade, anti-TNF-alpha antibody, and anti-ICAM-1 antibody on reperfusion injury.
- Analyzed fibrin deposition, leukocyte accumulation, and ultrastructural changes.
- Studied the involvement of the thromboxane A2-thromboxane A2 receptor system.
Main Results:
- Kupffer cell activation and endothelial damage occurred during cold preservation and reperfusion.
- Activated KC produced TNF-alpha, increasing ICAM-1 expression on endothelial cells.
- Hypercoagulability and leukocyte adherence were key components of reperfusion injury.
- KC blockade, anti-TNF-alpha, and anti-ICAM-1 treatments reduced injury, fibrin deposition, and leukocyte accumulation.
- KC blockade preserved sinusoidal endothelial cell integrity.
- The thromboxane A2 system also contributed to the pathogenesis.
Conclusions:
- Cold preservation/reperfusion injury involves sinusoidal microcirculatory disturbances.
- This injury is partly mediated by the interaction between activated Kupffer cells and sinusoidal endothelial cells.
- Key mediators include ICAM-1, cytokines (like TNF-alpha), and prostanoids.
- Targeting these interactions offers a potential therapeutic approach to prevent liver graft dysfunction.