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Fiber-specific cholesterol changes in murine dystrophy.

D E Kuhn, D M Logan

    Biochimica Et Biophysica Acta
    |September 4, 1987
    PubMed
    Summary
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    Cholesterol levels are elevated in dystrophic mouse muscle, particularly in fast-glycolytic fibers. This increase is mainly due to higher cholesterol esters, not just fiber type changes.

    Area of Science:

    • Biochemistry
    • Muscle Physiology
    • Cellular Biology

    Background:

    • Cholesterol concentration is reportedly increased in dystrophic mouse muscle compared to normal.
    • Muscle composition varies by fiber type, potentially influencing observed cholesterol levels.

    Purpose of the Study:

    • To investigate whether increased cholesterol in dystrophic muscle is a general rise or due to altered fiber type proportions.
    • To quantify free cholesterol and cholesterol ester concentrations in specific muscle tissues.

    Main Methods:

    • Measurement of free cholesterol and cholesterol ester concentrations in normal and dystrophic whole gastrocnemius muscles.
    • Comparison of cholesterol levels in whole muscles versus isolated fast-glycolytic muscle tissue.

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    Main Results:

    • Dystrophic muscle, both whole and fast-glycolytic sections, shows increased cholesterol concentrations compared to normal.
    • The largest increase observed is in the cholesterol ester fraction within dystrophic muscle.
    • Cholesterol ester differences in membrane and sarcoplasm fractions of fast-glycolytic fibers contribute significantly to concentration changes.

    Conclusions:

    • Changes in whole muscle cholesterol concentration in muscular dystrophy are not solely attributable to altered fiber type proportions.
    • Elevated cholesterol esters in specific fiber types, particularly fast-glycolytic fibers, are a key feature of dystrophic muscle.
    • The findings provide insights into the biochemical alterations in muscle during muscular dystrophy.