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[Cardiac beta receptors--experimental aspects].

A J Kaumann

    Zeitschrift Fur Kardiologie
    |February 1, 1983
    PubMed
    Summary

    Physiological agonists like adrenaline have low affinity for myocardial beta-adrenoceptors, but cardiac reserves allow significant effects. Human hearts show lower catecholamine potency and adenylyl cyclase reserve compared to other species.

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    Area of Science:

    • Cardiovascular Physiology
    • Adrenergic Receptor Pharmacology

    Context:

    • Myocardial beta-adrenoceptors mediate physiological responses to catecholamines (adrenaline, noradrenaline) and influence stimulant effects of related amines and beta-blockers.
    • Evidence suggests at least two beta-adrenoceptor subtypes in the heart, identified using selective beta-blockers and non-physiological agonists.
    • Previous research has not demonstrated differing affinities of physiological agonists for cardiac beta-adrenoceptor subtypes.

    Purpose:

    • To explore the possibility that agonists may induce greater conformational changes in one beta-adrenoceptor subtype than another, despite similar binding affinities.
    • To investigate the relationship between catecholamine concentration, beta-adrenoceptor occupancy, adenylyl cyclase stimulation, and physiological effects (inotropic, chronotropic) in the myocardium.
    • To compare the characteristics of catecholamine action and receptor reserves in isolated human myocardium versus other species.

    Summary:

    • Catecholamines exhibit low affinity for myocardial beta-adrenoceptors, yet achieve significant positive inotropic and chronotropic effects due to substantial beta-adrenoceptor and adenylyl cyclase reserves.
    • High catecholamine concentrations reduce adenylyl cyclase Vmax and the potency of catecholamines, but not their maximum inotropic/chronotropic effects, indicating reserve capacity.
    • Isolated human myocardium demonstrates lower catecholamine inotropic potency and a smaller adenylyl cyclase reserve compared to other species, with partial agonists like pindolol requiring higher concentrations for chronotropic effects.

    Impact:

    • Highlights the significant reserve capacity of the beta-adrenoceptor-adenylyl cyclase system in regulating cardiac function.
    • Suggests species-specific differences in myocardial beta-adrenergic signaling, particularly in human hearts.
    • Provides insights into the mechanisms underlying cardiac response to catecholamines and the action of beta-blockers.

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