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Nutritional modification of rat heart postnatal development.

R T Dowell

    The American Journal of Physiology
    |March 1, 1984
    PubMed
    Summary

    Nutritional changes in early life affect heart development. Faster growth in rat pups leads to increased heart DNA, mitochondria, and improved contractile function by 21 days.

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    Area of Science:

    • Cardiovascular Physiology
    • Developmental Biology
    • Nutritional Science

    Background:

    • Postnatal cardiac development involves increased cellularity and enhanced contractile performance.
    • Nutritional status significantly influences developmental trajectories in mammals.

    Purpose of the Study:

    • To investigate the impact of altered litter size on postnatal cardiac development and function in rats.
    • To determine the relationship between nutritional status, cardiac cellularity, aerobic capacity, and contractile performance.

    Main Methods:

    • Rats were assigned to different litter sizes (4, 8, or 16 pups) at 4 days postbirth to induce varying growth rates.
    • Cardiac cellularity (total DNA), systolic pressure, rate of pressure development (dP/dt), mitochondrial content (malate dehydrogenase), and myofibrillar ATPase activity were assessed at 21 days old.

    Main Results:

    • Left ventricular DNA content increased with faster growth (fewer rats per litter).
    • Slow-growing rats exhibited lower systolic pressure and dP/dt, while fast-growing rats reached adult levels.
    • Mitochondrial content increased with growth, correlating positively with dP/dt, but myofibrillar ATPase activity remained unchanged.

    Conclusions:

    • Nutritionally induced changes in postnatal cardiac development augment contractile function in proportion to increased heart DNA content.
    • Enhanced cardiac function is linked to increased mitochondrial capacity, independent of myofibrillar ATPase activity.

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