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Related Experiment Videos

Catecholamine modulation of spinal sympathetic reflexes.

E K Undesser, P Shinnick-Gallagher, J P Gallagher

    The Journal of Pharmacology and Experimental Therapeutics
    |April 1, 1981
    PubMed
    Summary

    Catecholamines modulate spinal sympathetic reflexes in frogs. Alpha-adrenoceptor agonists inhibit reflexes, while beta-adrenoceptor activation facilitates them, suggesting complex regulation.

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    Area of Science:

    • Neuroscience
    • Pharmacology
    • Physiology

    Background:

    • In vitro frog spinal cord sympathetic reflexes resemble in vivo cat reflexes.
    • The role of catecholamines and adrenoceptors in frog spinal sympathetic reflexes is not fully understood.

    Purpose of the Study:

    • To investigate catecholamine effects on frog spinal sympathetic reflexes.
    • To elucidate the adrenoceptor mechanisms underlying these effects.

    Main Methods:

    • In vitro frog spinal cord preparation.
    • Electrical stimulation of the spinal nerve.
    • Concentration-dependent application of catecholamines and adrenoceptor agonists/antagonists.

    Main Results:

    • Norepinephrine inhibited reflexes evoked by supramaximal stimuli via alpha-adrenoceptors.
    • Epinephrine facilitated reflexes, but inhibited them in the presence of propranolol (beta-adrenoceptor antagonist).
    • Dopamine and l-Dopa also modulated reflex activity through specific mechanisms.

    Conclusions:

    • Alpha-adrenoceptor agonists inhibit spinal sympathetic reflexes in a stimulation-intensity-dependent manner.
    • Beta-adrenoceptor activation facilitates these reflexes.
    • These findings highlight the role of adrenoceptors in modulating sympathetic preganglionic activity.

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