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Mitochondrial function in canine experimental cardiac hypertrophy.

M A Matlib, J C Rembert, R W Millard

    Journal of Molecular and Cellular Cardiology
    |April 1, 1983
    PubMed
    Summary
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    This study modeled cardiac hypertrophy in dogs, finding that despite increased heart mass and pressure, mitochondrial function remained preserved. This suggests mitochondria can meet the energy demands of stable, long-term cardiac hypertrophy.

    Area of Science:

    • Cardiovascular Research
    • Cellular Biology
    • Biochemistry

    Background:

    • Concentric left ventricular hypertrophy (LVH) is a significant cardiovascular condition.
    • Understanding the bioenergetic adaptations in sustained LVH is crucial for therapeutic development.

    Purpose of the Study:

    • To investigate mitochondrial function in a long-term model of stable concentric left ventricular hypertrophy.
    • To determine if mitochondrial capacity is sufficient to meet increased energy demands in this cardiac hypertrophy model.

    Main Methods:

    • Created concentric left ventricular hypertrophy in puppies via aortic coarctation banding.
    • Performed hemodynamic, morphologic, and biochemical analyses 18 months post-operation.
    • Assessed mitochondrial respiration, phosphorylation, and enzyme activities in isolated mitochondria.

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    Main Results:

    • Experimental dogs exhibited significantly elevated systolic blood pressure (216 mmHg) and increased left ventricular mass (approx. 60%) compared to controls.
    • Despite hypertrophy, ejection fraction was maintained, and no overt heart failure was observed.
    • Isolated mitochondria from hypertrophic hearts showed normal ultrastructure, respiration rates, and key enzyme activities (citrate synthase, cytochrome c oxidase).

    Conclusions:

    • Mitochondrial function is adequately preserved in this established model of stable cardiac hypertrophy.
    • The cellular bioenergetics appear sufficient to meet the increased energy demands associated with long-duration cardiac hypertrophy.