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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Related Experiment Video

Updated: Apr 26, 2026

Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry
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Mitochondrial uncoupling does not decrease reactive oxygen species production after ischemia-reperfusion.

Ricardo Quarrie1, Daniel S Lee1, Levy Reyes2

  • 1Division of Cardiac Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio;

American Journal of Physiology. Heart and Circulatory Physiology
|August 3, 2014
PubMed
Summary
This summary is machine-generated.

Increasing mitochondrial H(+) leak does not reduce reactive oxygen species (ROS) after cardiac ischemia-reperfusion (IR). Ischemic preconditioning (IPC) did not alter H(+) leak, suggesting NADPH replenishment may combat IR-induced oxidative damage.

Keywords:
ischemia-reperfusionmitochondriaproton leakreactive oxygen speciesuncoupling

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Area of Science:

  • Cardiovascular Physiology
  • Mitochondrial Biology
  • Oxidative Stress

Background:

  • Cardiac ischemia-reperfusion (IR) injury elevates reactive oxygen species (ROS), causing myocardial dysfunction.
  • Mitochondrial H(+) leak is known to decrease ROS production, but its role in IR and the mechanism of ischemic preconditioning (IPC) remain unclear.

Purpose of the Study:

  • To investigate if pharmacologically increasing mitochondrial H(+) leak reduces ROS production post-IR.
  • To determine if IPC is associated with an increased rate of mitochondrial H(+) leak.

Main Methods:

  • Isolated rat hearts underwent control or IPC protocols, followed by ischemia and reperfusion.
  • Mitochondria were isolated to measure membrane potential (mΔΨ), ROS production, and pyridine dinucleotide levels (NADPH, NADH).
  • Mitochondrial uncoupling was induced using FCCP to assess H(+) leak effects.

Main Results:

  • Before IR, increasing H(+) leak reduced mitochondrial ROS production.
  • After IR, altering H(+) leak did not affect ROS production.
  • H(+) leak increased in control mitochondria during ischemia, but not in IPC mitochondria.
  • NADPH levels decreased post-IR, while NADH levels increased in both groups.

Conclusions:

  • Pharmacological enhancement of mitochondrial H(+) leak is ineffective in decreasing ROS production after cardiac IR.
  • NADPH depletion post-IR suggests that replenishing this cofactor may be a viable strategy to mitigate oxidative damage.