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Peritoneal fluid in human acute pancreatitis blocks hepatic mitochondrial respiration

J M Coticchia, M A Lessler, L C Carey

    Surgery
    |November 1, 1986
    PubMed

    Insights

    Human pancreatic ascitic fluid (HPAF) from acute pancreatitis patients is toxic to liver mitochondria. This study demonstrates HPAF impairs mitochondrial respiration and function, contributing to multi-system failure in pancreatitis.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Gastroenterology

    Background:

    • Acute pancreatitis can lead to multi-system organ failure.
    • Peritoneal fluid, specifically human pancreatic ascitic fluid (HPAF), is implicated as a potential source of this toxicity.
    • Understanding the cellular mechanisms of HPAF toxicity is crucial for developing effective treatments.

    Purpose of the Study:

    • To investigate the in vitro toxicity of HPAF on isolated rat hepatocyte mitochondria.
    • To assess the impact of HPAF on mitochondrial oxidative activity and respiratory function.

    Main Methods:

    • Hepatocyte mitochondria were isolated from Sprague-Dawley rats.
    • Mitochondrial oxidative activity was measured using an oxygen electrode system.
    • The effects of varying concentrations of sterile-collected HPAF on state 4 and state 3 respiration, and respiratory control ratio were analyzed.
    • Control experiments used pooled human serum.

    Main Results:

    • All tested HPAF samples significantly increased state 4 mitochondrial respiration (p < 0.05).
    • HPAF significantly decreased the respiratory control ratio in all specimens (p < 0.05).
    • A dose-response relationship between HPAF concentration and mitochondrial dysfunction was observed in 8 out of 12 samples.

    Conclusions:

    • Human pancreatic ascitic fluid exhibits direct toxicity to liver mitochondria.
    • HPAF impairs mitochondrial respiratory function, evidenced by increased basal respiration and reduced respiratory control.
    • These findings suggest that HPAF-induced mitochondrial damage may contribute to the multi-system failure observed in acute pancreatitis.

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