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Related Experiment Videos

Developmental change in the function of sarcoplasmic reticulum.

M Seguchi, J A Harding, J M Jarmakani

    Journal of Molecular and Cellular Cardiology
    |February 1, 1986
    PubMed
    Summary

    Sarcoplasmic reticulum function significantly changes from fetal to adult rabbit hearts. Adult hearts rely on sarcoplasmic reticulum for calcium handling, while perinatal hearts depend more on transsarcolemmal calcium influx.

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    Area of Science:

    • Cardiology
    • Developmental Biology
    • Physiology

    Background:

    • Sarcoplasmic reticulum (SR) plays a crucial role in cardiac excitation-contraction coupling.
    • Understanding the developmental changes in SR function is vital for comprehending perinatal and adult cardiac physiology.

    Purpose of the Study:

    • To investigate the developmental trajectory of sarcoplasmic reticulum function in rabbit hearts from the fetal stage to adulthood.
    • To elucidate the differential reliance on SR calcium handling versus transsarcolemmal calcium influx during cardiac development.

    Main Methods:

    • Utilized the isolated, arterially perfused rabbit heart model.
    • Employed ryanodine, a specific modulator of SR calcium release channels, to assess SR function.
    • Evaluated functional parameters including inotropic effects, relaxation time, time to peak tension, resting tension, and response to various stimulation protocols.

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    Main Results:

    • The negative inotropic effect of ryanodine showed developmental changes, being less pronounced in newborns compared to adults.
    • Ryanodine induced significant alterations in relaxation dynamics and resting tension in adult hearts, but not in newborns.
    • Adult hearts demonstrated greater sensitivity to ryanodine's effects on attenuating positive inotropism compared to 3-day-old newborns.

    Conclusions:

    • Cardiac sarcoplasmic reticulum function undergoes substantial maturation during the perinatal period.
    • Adult rabbit hearts are significantly dependent on sarcoplasmic reticulum calcium release and uptake for normal function.
    • Perinatal rabbit hearts rely more heavily on transsarcolemmal calcium influx for excitation-contraction coupling than on sarcoplasmic reticulum calcium release.