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Related Experiment Videos

Liver oxygen uptake dependence and mitochondrial function in septic rats

J J Poderoso1, S Fernandez, M C Carreras

  • 1Laboratory of Oxygen Metabolism, School of Medicine, University of Buenos Aires, Argentina.

Circulatory Shock
|December 1, 1994
PubMed
Summary

Sepsis increases liver oxygen consumption and dependence on oxygen supply. This is linked to enhanced mitochondrial activity and changes in respiratory enzymes, impacting tissue metabolism.

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Area of Science:

  • Biochemistry
  • Physiology
  • Pathology

Background:

  • Defective oxygen consumption is a hallmark of sepsis.
  • The dependence of oxygen uptake on oxygen supply is critical in sepsis pathophysiology.

Purpose of the Study:

  • To investigate the relationship between tissue and mitochondrial metabolism in sepsis.
  • To analyze oxygen uptake in rat liver under varying oxygen supply conditions during sepsis.

Main Methods:

  • Experimental sepsis induced in rats via cecal ligation and puncture.
  • Measurement of oxygen uptake in whole isolated perfused rat liver, liver slices, and isolated liver mitochondria.
  • Assay of mitochondrial and submitochondrial respiratory enzyme activity.

Main Results:

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  • Septic rat livers and tissue slices exhibited a 60% increase in oxygen uptake compared to controls.
  • Liver oxygen uptake in septic animals showed significant dependence on oxygen supply.
  • Mitochondrial oxygen uptake increased by 30% with malate-glutamate, and NADH-dehydrogenase activity doubled in septic samples.

Conclusions:

  • Increased mitochondrial oxygen consumption and altered respiratory enzyme activity contribute to altered tissue oxygen metabolism in sepsis.
  • Oxygen dependence in sepsis is influenced by oxygen availability and enhanced mitochondrial respiration.