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Related Experiment Videos

Calcium-agonists.

M Bechem, M Schramm

    Journal of Molecular and Cellular Cardiology
    |May 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Calcium agonistic 1,4-dihydropyridines, like BAY K 8644, exhibit vasoconstricting effects. Enantiomers display opposing actions on calcium channels, with one acting as an agonist and the other as an antagonist.

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    Area of Science:

    • Pharmacology
    • Molecular Biology
    • Cardiovascular Research

    Background:

    • 1,4-dihydropyridines typically act as calcium channel blockers.
    • A novel class of calcium agonistic 1,4-dihydropyridines exhibits distinct pharmacological properties.

    Purpose of the Study:

    • To characterize the novel calcium agonistic properties of 1,4-dihydropyridines, using BAY K 8644 as a prototype.
    • To investigate the enantioselective effects of BAY K 8644 on calcium channels.

    Main Methods:

    • Electrophysiological studies utilizing voltage clamp techniques.
    • Kinetic analysis of calcium current activation and deactivation.
    • Pharmacological profiling of racemic and enantiomeric forms of BAY K 8644.

    Main Results:

    Related Experiment Videos

    • BAY K 8644 acts as a calcium agonist, inducing vasoconstriction and positive inotropic effects.
    • Enantiomers of BAY K 8644 display opposing activities: one is a potent agonist, while the other is a weaker antagonist.
    • BAY K 8644 increases mean open times of calcium channels without altering closed times, suggesting binding to the open state.

    Conclusions:

    • BAY K 8644 represents a new class of calcium channel agonists with significant cardiovascular effects.
    • The enantiomers of BAY K 8644 demonstrate stereospecific interactions with calcium channels.
    • A kinetic model suggests BAY K 8644 preferentially binds to the open conformation of the calcium channel.