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[THE ENERGY FUNCTION OF RAT CARDIAC MITOCHONDRIA UNDER ARTIFICIAL HYPOBIOSIS].

S D Melnytchuk, S V Khyzhnyak, V S Morozova

    Fiziolohichnyi Zhurnal (Kiev, Ukraine : 1994)
    |September 22, 2015
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    Artificial carbon dioxide hypobiosis reduces mitochondrial energy production in rat heart cells. However, using succinate supports mitochondrial function, indicating an adaptive response to hypobiosis.

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    Area of Science:

    • Mitochondrial physiology
    • Cardiology
    • Hypobiosis research

    Background:

    • Mitochondria are crucial for cellular energy production in cardiomyocytes.
    • Artificial carbon dioxide hypobiosis induces physiological changes like decreased body temperature and heart rate.
    • Understanding mitochondrial adaptation during hypobiosis is vital for physiological research.

    Purpose of the Study:

    • To investigate the impact of artificial carbon dioxide hypobiosis on mitochondrial energy activity in rat cardiomyocytes.
    • To determine the effects of different substrates (succinate and malate) on mitochondrial respiration and phosphorylation.
    • To elucidate the adaptive mechanisms of cardiomyocyte mitochondria under hypobiotic conditions.

    Main Methods:

    • Isolated rat cardiomyocytes were subjected to artificial carbon dioxide hypobiosis.
    • Mitochondrial respiratory and phosphorylation activities were measured using succinate and malate as substrates.
    • Activities of specific respiratory chain complexes (NADH-KoQ-oxidoreductase, succinate dehydrogenase, cytochrome oxidase) and ATP-synthetase were assessed.

    Main Results:

    • Hypobiosis reduced mitochondrial respiratory and phosphorylation activities with both succinate and malate.
    • Partial uncoupling of oxidation and phosphorylation occurred with malate but not succinate.
    • NADH-KoQ-oxidoreductase (Complex I) activity was inhibited, while succinate dehydrogenase and cytochrome oxidase activities remained unchanged.
    • ATP-synthetase activity suggested maintained mitochondrial functional capacity, particularly with succinate.

    Conclusions:

    • Artificial carbon dioxide hypobiosis alters cardiomyocyte mitochondrial function.
    • Succinate appears to be a preferred substrate supporting mitochondrial energy production during hypobiosis.
    • Cardiomyocyte mitochondria exhibit adaptive modifications in their inner membrane structure and function to cope with hypobiosis.