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Mitochondrial transmembrane potential and pH gradient during anoxia.

B S Andersson, T Y Aw, D P Jones

    The American Journal of Physiology
    |April 1, 1987
    PubMed
    Summary

    Anoxia decreases mitochondrial transmembrane potential but maintains the pH gradient in hepatocytes. The protonmotive force is retained, suggesting mechanisms preserve ion distribution during oxygen deprivation.

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    Area of Science:

    • Cellular biology
    • Mitochondrial function
    • Anoxia research

    Background:

    • Mitochondria are vital for cellular energy production.
    • Anoxia (oxygen deprivation) significantly impacts cellular metabolism and function.
    • Understanding how mitochondria respond to anoxia is crucial for cell survival.

    Purpose of the Study:

    • To investigate the effects of anoxia on mitochondrial transmembrane potential and pH gradient in isolated hepatocytes.
    • To determine the impact of anoxia on the protonmotive force in hepatocytes.
    • To explore mechanisms preserving mitochondrial function during anoxia.

    Main Methods:

    • Isolated hepatocytes were subjected to anoxia.
    • Mitochondrial transmembrane potential (delta psi) was measured using triphenylmethylphosphonium distribution.
    • Mitochondrial and cytosolic pH gradients (delta pH) were determined using dimethadione distribution.

    Main Results:

    • Anoxia caused a decrease in mitochondrial transmembrane potential from -163 to -133 mV.
    • The mitochondrial-cytosolic pH gradient remained largely unchanged during anoxia.
    • The protonmotive force was significantly retained despite the absence of electron flow and ATP synthesis.

    Conclusions:

    • Hepatocytes largely maintain their protonmotive force during anoxia.
    • This retention is independent of ATP utilization from glycolysis.
    • Specific mechanisms likely exist to preserve mitochondrial ion distribution under anoxic conditions.

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