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Updated: Aug 18, 2026

A Flow Cytometry-based Assay for Measuring Mitochondrial Membrane Potential in Cardiac Myocytes After Hypoxia/Reoxygenation
07:14

A Flow Cytometry-based Assay for Measuring Mitochondrial Membrane Potential in Cardiac Myocytes After Hypoxia/Reoxygenation

Published on: July 13, 2018

[Mg2+ release from heart mitochondria in ischemia: is it the defense mechanism or damage?]

V V Lemeshko, P Malanda

    Ukrainskii Biokhimicheskii Zhurnal (1978)
    |January 1, 1989
    PubMed

    Insights

    During early heart ischemia in rats, mitochondrial ATP hydrolysis significantly decreases. This suggests a cellular defense mechanism to protect against ATP breakdown during oxygen deprivation.

    Area of Science:

    • Biochemistry
    • Mitochondrial Physiology
    • Cardiovascular Research

    Context:

    • Early stage of total heart ischemia (5-10 minutes) in rat models.
    • Mitochondria play a crucial role in cellular energy production and are vulnerable to ischemic conditions.
    • Investigating early biochemical changes in mitochondria during ischemia is vital for understanding heart injury.

    Purpose:

    • To investigate the changes in mitochondrial ATPase activity during the early stages of total heart ischemia.
    • To explore the potential role of magnesium ions (Mg2+) in mitochondrial response to ischemia.
    • To propose a hypothetical mechanism for Mg2+ ejection from mitochondria during respiration cessation.

    Summary:

    • In early rat heart ischemia, oligomycin-sensitive ATPase activity in mitochondria (without Mg2+) significantly decreased.
    • Mitochondrial respiratory chain activity, respiratory control, and Mg2+-ATPase activity remained largely unchanged.
    • A hypothetical trigger mechanism for Mg2+ ejection from mitochondria during respiration cessation is proposed.

    Impact:

    • The findings suggest a protective cellular defense mechanism against excessive ATP hydrolysis by mitochondria during ischemia.
    • Understanding these early mitochondrial responses can inform strategies for mitigating ischemic heart damage.
    • This research provides insights into the biochemical adaptations of mitochondria under acute oxygen deprivation.

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