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NFkappaB expression during cold ischemia correlates with postreperfusion graft function.

R Ricciardi1, R D Kim, T P McDade

  • 1Department of Surgery, University of Massachusetts Medical School, Worcester, Massachusetts 01655, USA. rocco.ricciardi@umassmed.edu

The Journal of Surgical Research
|August 18, 2000
PubMed
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Nuclear Factor kappa B (NFkappaB) activation occurs during cold ischemia in liver transplantation, not just reperfusion. Early NFkappaB expression during ischemia inversely correlates with post-reperfusion liver graft function.

Area of Science:

  • Transplantation immunology
  • Hepatology
  • Molecular biology

Background:

  • Nuclear Factor kappa B (NFkappaB) activation is known to occur during liver reperfusion.
  • Limited data exist on NFkappaB activation during the cold ischemia phase of liver preservation.
  • Understanding early inflammatory responses is crucial for improving post-transplant outcomes.

Purpose of the Study:

  • To investigate the temporal activation of NFkappaB during cold ischemia in liver transplantation.
  • To determine if NFkappaB activation during cold ischemia influences post-reperfusion liver function.
  • To identify potential early biomarkers for graft viability.

Main Methods:

  • Porcine liver biopsies were collected at multiple time points: pre-ischemia, during cold ischemia (45, 120 min), and post-reperfusion (60, 180 min).

Related Experiment Videos

  • Nuclear extracts were analyzed for NFkappaB expression using Western blot.
  • Hepatic function was assessed by monitoring bile output and sorbitol dehydrogenase (SDH) activity.

    • Main Results:

    • NFkappaB expression peaked at 45 minutes of cold ischemia and decreased by 120 minutes.
    • NFkappaB expression at 120 minutes of cold ischemia correlated with post-reperfusion bile flow and SDH activity.
    • A second NFkappaB activation peak was observed 180 minutes after reperfusion, correlating with prior ischemic expression and increased SDH activity.

    Conclusions:

    • NFkappaB exhibits two distinct activation peaks: one during cold ischemia and another post-reperfusion.
    • Enhanced NFkappaB expression during cold ischemia correlates with reperfusion activation and inversely with graft function.
    • Targeting NFkappaB during the cold ischemic period may represent a novel strategy to improve liver transplant outcomes.