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Related Experiment Videos

Studies on renin activation in normal human plasma

P Eggena, J D Barrett, C E Wiedman

    Hypertension (Dallas, Tex. : 1979)
    |September 1, 1979
    PubMed
    Summary

    Acid dialysis and trypsin activate plasma renin, a key enzyme in blood pressure regulation. This study reveals a protease involvement in acid activation and suggests a common mechanism for both activation methods.

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    Area of Science:

    • Biochemistry
    • Physiology
    • Enzymology

    Background:

    • Plasma renin is a crucial enzyme in the renin-angiotensin-aldosterone system, regulating blood pressure.
    • Understanding renin activation mechanisms is vital for managing hypertensive disorders.

    Purpose of the Study:

    • To investigate the activation of plasma renin by acid dialysis and trypsin.
    • To elucidate the enzymatic mechanisms underlying renin activation.

    Main Methods:

    • Normal human plasma was subjected to acid dialysis (pH 3.3) and preincubation with trypsin.
    • Enzyme activity was assessed, and inhibition studies using Trasylol were performed.
    • Partial purification of inactive renins/renin-like enzymes was achieved via affinity chromatography, precipitation, and isoelectric focusing.

    Main Results:

    • Acid dialysis, requiring at least one step, activated plasma renin.
    • Trasylol inhibited acid activation, indicating protease involvement.
    • Amniotic fluid contained an enzyme capable of activating plasma renin.
    • Activated renin exhibited Michaelis-Menten kinetics (Km) and molecular weight similar to normal plasma renin.
    • Trypsin and acid exposure yielded comparable activation results for purified inactive renin.

    Conclusions:

    • Acid dialysis and trypsin activate plasma renin through a protease-dependent mechanism.
    • These methods may activate plasma renin via a shared enzymatic pathway.
    • The findings contribute to understanding renin regulation and potential therapeutic targets.

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