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Related Experiment Videos

Motoneuronal after-potentials and extracellular divalent cations.

K Krnjević, Y Lamour, J F MacDonald

    Canadian Journal of Physiology and Pharmacology
    |June 1, 1978
    PubMed
    Summary
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    Divalent cations like cobalt and manganese reduce the postspike hyperpolarizing after-potential (AHP) in cat spinal motoneurons. This suggests the AHP originates from calcium influx during action potentials, unlike the depolarizing after-potential (ADP).

    Area of Science:

    • Neurophysiology
    • Cellular Neuroscience
    • Ion Channel Function

    Background:

    • Spinal motoneurons exhibit distinct after-potentials following action potentials, including the hyperpolarizing after-potential (AHP) and depolarizing after-potential (ADP).
    • The ionic mechanisms underlying these after-potentials are crucial for understanding neuronal excitability and synaptic integration.
    • Previous research suggested a role for calcium ions in neuronal after-potentials, but specific contributions to AHP and ADP remained debated.

    Purpose of the Study:

    • To investigate the specific ionic basis of the postspike hyperpolarizing after-potential (AHP) and depolarizing after-potential (ADP) in cat lumbosacral motoneurons.
    • To differentiate the ion channel conductances responsible for AHP and ADP using divalent cations as pharmacological tools.

    Main Methods:

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    • Microiontophoresis of divalent cations (Co2+, Mn2+, Sr2+) was employed in cats under Dial anesthesia.
    • Extracellular recordings were used to monitor the effects of iontophoretic injections on lumbosacral motoneuronal activity.
    • Changes in the amplitude and duration of the AHP and ADP following action potentials were analyzed.

    Main Results:

    • Microiontophoretic application of Co2+ and Mn2+ significantly diminished the AHP without substantially affecting the ADP.
    • Conversely, Sr2+ injections led to an augmentation of the AHP.
    • These differential effects highlight distinct ionic mechanisms for AHP and ADP.

    Conclusions:

    • The results strongly support the hypothesis that the AHP in spinal motoneurons is initiated by a calcium influx associated with the action potential.
    • The ADP is unlikely to be primarily mediated by a calcium-dependent inward current, suggesting alternative ionic or cellular mechanisms.
    • Divalent cations serve as effective probes for dissecting the ion channel contributions to neuronal after-potentials.