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Related Experiment Videos

Normalization of depressed heart function in rats by ribose.

H G Zimmer

    Science (New York, N.Y.)
    |April 1, 1983
    PubMed
    Summary

    Ribose supplementation prevented heart dysfunction caused by aortic constriction and isoproterenol in rats. This suggests ribose protects the heart by boosting cardiac adenine nucleotide metabolism, highlighting adenosine triphosphate's role in myocardial contractility.

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    Area of Science:

    • Cardiovascular Physiology
    • Biochemistry
    • Pharmacology

    Background:

    • Aortic constriction and isoproterenol administration in rats cause cardiac dysfunction.
    • This dysfunction is associated with reduced cardiac adenosine triphosphate (ATP) and total adenine nucleotides.
    • Understanding the role of adenine nucleotides in myocardial contractility is crucial.

    Purpose of the Study:

    • To investigate the cardioprotective effects of ribose in a rat model of cardiac dysfunction.
    • To determine if ribose can prevent reductions in cardiac adenine nucleotides and preserve heart function.
    • To explore the role of ATP in myocardial contractility depression.

    Main Methods:

    • Rats underwent severe abdominal aorta constriction.
    • Isoproterenol was administered to induce cardiac stress.
    • Ribose was infused continuously for 24 hours in experimental groups.
    • Cardiac function and adenine nucleotide levels (ATP, total adenine nucleotides) were measured.
    • Left ventricular hemodynamic parameters were assessed.

    Main Results:

    • Aortic constriction plus isoproterenol led to depressed heart function and decreased cardiac ATP and total adenine nucleotides.
    • Continuous ribose infusion prevented these reductions in ATP and total adenine nucleotides.
    • Ribose infusion maintained normal left ventricular hemodynamic parameters.
    • Cardiac adenine nucleotide biosynthesis was significantly stimulated by ribose.

    Conclusions:

    • Adenosine triphosphate is primarily responsible for the depression of myocardial contractility.
    • Ribose exhibits cardioprotective effects by enhancing adenine nucleotide metabolism in heart muscle.
    • Ribose supplementation is a potential therapeutic strategy for preserving cardiac function under stress.

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