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Mapping Metabolism: Monitoring Lactate Dehydrogenase Activity Directly in Tissue
06:18

Mapping Metabolism: Monitoring Lactate Dehydrogenase Activity Directly in Tissue

Published on: June 21, 2018

Myocardial LDH isozyme distribution in the ischemic and hypoxic heart

G L Hammond, B Nadal-Ginard, N S Talner

    Circulation
    |April 1, 1976
    PubMed

    Insights

    Coronary artery disease alters heart muscle's lactate dehydrogenase (LDH) subunit composition, shifting it towards anaerobic metabolism. This change may enhance glycolysis for energy production during chronic ischemia.

    Area of Science:

    • Biochemistry
    • Cardiology
    • Cellular Metabolism

    Background:

    • Lactate dehydrogenase (LDH) isozymes play a crucial role in cellular energy production.
    • Cardiac muscle metabolism adapts to varying oxygen availability.
    • Coronary artery disease (CAD) and congenital heart defects (CHDs) present distinct physiological challenges.

    Purpose of the Study:

    • To investigate the LDH isozyme distribution in myocardial tissue from patients with coronary artery disease.
    • To compare LDH isozyme patterns in CAD with those in cyanotic and acyanotic congenital heart defects.
    • To explore potential metabolic adaptations in cardiac muscle under ischemic conditions.

    Main Methods:

    • Myocardial tissue specimens were collected from patients undergoing cardiac surgery.
    • LDH isozyme analysis was performed on tissue samples.
    • Control groups included patients with acyanotic CHDs and normal coronary arteries.

    Main Results:

    • A significant 42% increase in LDH A subunits was observed in coronary patients compared to controls.
    • This indicates a shift towards anaerobic isozyme distribution in ischemic heart muscle.
    • No significant changes in LDH A subunits were found in cyanotic versus acyanotic hearts.

    Conclusions:

    • Cardiac muscle in patients with coronary vascular disease exhibits altered LDH subunit composition.
    • This alteration is distinct from changes seen in chronic systemic hypoxia.
    • The findings suggest a compensatory cellular mechanism enhancing glycolysis for energy production during chronic myocardial ischemia.

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