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Related Experiment Videos

Mechanism of hepatocellular dysfunction during hyperdynamic sepsis

P Wang1, I H Chaudry

  • 1Department of Surgery, Michigan State University, East Lansing, 48824, USA.

The American Journal of Physiology
|May 1, 1996
PubMed
Summary

Hepatocellular dysfunction, or liver cell impairment, occurs early in sepsis, preceding liver damage. This dysfunction is linked to inflammatory cytokines like tumor necrosis factor (TNF) and interleukin (IL)-6, not reduced liver blood flow.

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Area of Science:

  • Hepatology
  • Immunology
  • Critical Care Medicine

Background:

  • The liver plays a crucial role in metabolism and host defense, making it a key organ in sepsis-induced multiple organ failure.
  • Early hepatocellular dysfunction during sepsis is critical to understand, particularly if it precedes detectable liver damage.

Purpose of the Study:

  • To investigate whether hepatocellular dysfunction occurs in early sepsis.
  • To determine if hepatocellular dysfunction precedes liver damage indicated by elevated serum enzymes.
  • To explore the mechanisms behind early sepsis-induced hepatocellular dysfunction.

Main Methods:

  • Developed a technique for repeated in vivo indocyanine green (ICG) clearance measurements in rats to assess hepatocyte transport function.
  • Studied hepatocellular function during early polymicrobial sepsis in a rat model.

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  • Investigated the effects of administering recombinant murine tumor necrosis factor-alpha (TNF-α).

    • Main Results:

    • Hepatocellular function was significantly depressed in early, hyperdynamic sepsis, despite increased cardiac output and hepatic blood flow.
    • This dysfunction was not attributed to reduced hepatic perfusion but correlated with elevated levels of proinflammatory cytokines, including TNF and IL-6.
    • Administration of TNF-α induced hepatocellular dysfunction and increased IL-6 levels, even without affecting cardiac output or hepatic perfusion.

    Conclusions:

    • Hepatocellular dysfunction is an early event in sepsis, occurring independently of reduced liver perfusion.
    • Upregulation of TNF and/or IL-6 is implicated as a primary cause of hepatocellular dysfunction during the early, hyperdynamic phase of sepsis.
    • ICG clearance is a sensitive indicator of early hepatocyte transport function impairment in sepsis.