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Related Experiment Videos

Mitochondrial respiration after sepsis and prolonged hypoxia

D E Taylor1, S P Kantrow, C A Piantadosi

  • 1Department of Medicine, University of Texas-Houston Medical Center, Houston, Texas 77030, USA.

The American Journal of Physiology
|August 5, 1998
PubMed
Summary

Mitochondria respiration shows modest oxygen dependence in sepsis. Isolated mitochondria from septic rats did not exhibit increased oxygen dependence compared to controls after hypoxic exposure.

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Area of Science:

  • Mitochondrial physiology
  • Cellular respiration
  • Critical illness pathophysiology

Background:

  • Mitochondrial oxygen-dependent respiration is crucial for cellular energy production.
  • Previous studies suggested marked oxygen dependence of mitochondrial respiration after prolonged hypoxia.
  • This behavior could significantly impact oxygen consumption during critical illness, such as sepsis.

Purpose of the Study:

  • To confirm the oxygen-dependent behavior of mitochondria.
  • To investigate if mitochondria isolated during sepsis exhibit increased oxygen dependence.
  • To assess the impact of hypoxic exposure on mitochondrial oxygen dependence.

Main Methods:

  • Isolation of rat liver mitochondria 16 hours after cecal ligation and puncture (sepsis model) or sham operation (control).

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  • Measurement of mitochondrial oxygen uptake under state 3 conditions.
  • Assessment of mitochondrial respiration and oxygen dependence after incubation in deoxygenated buffer for up to 90 minutes, with reoxygenation at varying oxygen tensions (10-100 Torr).

    • Main Results:

    • Septic rat mitochondria showed 30-40% greater oxygen uptake under state 3 conditions compared to controls.
    • Mitochondrial respiration remained stable in controls but decreased slightly (10-15%) in septic rats after 60 minutes of hypoxia.
    • A modest oxygen dependence of respiration was observed between 10 and 100 Torr, similar for both septic and control mitochondria.
    • No significant increase in oxygen dependence was noted during 1 hour of hypoxic incubation for well-coupled mitochondria.

    Conclusions:

    • Mitochondrial respiration exhibits only a modest oxygen dependence within the tested physiological range (10-100 Torr).
    • Sepsis did not significantly increase the oxygen dependence of isolated rat liver mitochondria.
    • Prolonged hypoxic incubation did not enhance mitochondrial oxygen dependence in well-coupled preparations.