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Expression of GMP-140 (P-selectin) correlates with graft viability in cold-preserved rat livers
J Basile1, L Wang, A Tarcsafalvi
1The Recanati/Miller Transplantation Institute, Mount Sinai School of Medicine, New York, New York 10029, USA.
Background:
Ischemia/reperfusion injury is an inflammatory process involving cytokine release, Kupffer cell activation, and sinusoidal endothelial cell activation. GMP-140 is synthesized by endothelial cells.
Methods:
We analyzed by Western blotting the expression of GMP-140 in a syngeneic rat liver transplantation model using grafts preserved for different periods of time.
Results:
Compared with prereperfusion samples, expression did not change significantly in freshly harvested and 4-hr preserved livers. In grafts preserved for 24 hr (100% survival), GMP-140 levels increased dramatically at 1 hr, then returned to baseline at 24 hr after transplantation. Forty-eight hour preserved grafts (0% survival) showed a decreasing expression. To identify possible mediators, the effects of tumor necrosis factor-alpha and interleukin-1beta on GMP-140 expression in primary sinusoidal endothelial cells were analyzed. These cytokines increased both the percentage of stained cells as well as their mean staining fluorescence.
Conclusions:
The absence of increase in 48-hr grafts suggests that GMP-140 may distinguish viable from nonviable livers.
Insights
GMP-140 expression in liver grafts indicates viability. Increased GMP-140 levels after 24-hour preservation suggest a viable liver, while decreasing levels in 48-hour preserved grafts indicate non-viability.
Area of Science:
- Hepatology
- Transplantation Immunology
- Cellular Biology
Background:
- Ischemia/reperfusion injury involves inflammation, cytokine release, and cell activation in the liver.
- GMP-140 (also known as P-selectin) is a molecule synthesized by endothelial cells.
- Sinusoidal endothelial cell activation is a key component of liver ischemia/reperfusion injury.
Purpose of the Study:
- To investigate the expression of GMP-140 in rat liver grafts preserved for varying durations.
- To determine if GMP-140 expression levels correlate with graft viability after transplantation.
- To explore the role of cytokines like TNF-alpha and IL-1beta in regulating GMP-140 expression.
Main Methods:
- Western blotting was used to analyze GMP-140 expression in rat liver grafts.
- Grafts were preserved for different time periods (fresh, 4 hr, 24 hr, 48 hr) before transplantation.
- Primary rat sinusoidal endothelial cells were treated with tumor necrosis factor-alpha and interleukin-1beta to assess their effect on GMP-140 expression.
Main Results:
- GMP-140 expression remained unchanged in freshly harvested and 4-hour preserved livers.
- A significant increase in GMP-140 levels was observed 1 hour after transplantation in 24-hour preserved grafts, returning to baseline by 24 hours.
- Grafts preserved for 48 hours showed a decrease in GMP-140 expression, correlating with 0% survival.
- Tumor necrosis factor-alpha and interleukin-1beta increased GMP-140 expression in primary sinusoidal endothelial cells.
Conclusions:
- GMP-140 expression levels may serve as an indicator of liver graft viability.
- The absence of GMP-140 upregulation in 48-hour preserved grafts suggests non-viability.
- Cytokines play a role in modulating GMP-140 expression in the context of liver transplantation and injury.