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Neurotransmitters decrease the calcium conductance activated by depolarization of embryonic chick sensory neurones.

K Dunlap, G D Fischbach

    The Journal of Physiology
    |August 1, 1981
    PubMed
    Summary
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    Neurotransmitters like noradrenaline, GABA, and serotonin shorten action potentials by directly reducing calcium (Ca2+) channel current (ICa) in sensory neurons. This modulation of ICa, not affecting other currents, has implications for presynaptic inhibition.

    Area of Science:

    • Neuroscience
    • Cellular Electrophysiology
    • Neuropharmacology

    Background:

    • Neurotransmitters modulate neuronal excitability.
    • Action potential duration is critical for neuronal function.
    • Calcium channels play a key role in neuronal signaling.

    Purpose of the Study:

    • To investigate the ionic mechanisms by which neurotransmitters affect action potential duration.
    • To determine if neurotransmitters target calcium (Ca2+) or potassium (K+) channels.
    • To elucidate the role of these modulations in presynaptic inhibition.

    Main Methods:

    • Whole-cell voltage-clamp recordings from embryonic chick dorsal root ganglion neurons in cell culture.
    • Measurement of membrane currents including Na+, Ca2+, and K+ currents.

    Related Experiment Videos

  • Application of neurotransmitters like noradrenaline (NA), GABA, and serotonin (5-HT).

    • Main Results:

    • NA, GABA, and 5-HT decreased the inward calcium current (ICa) without affecting Na+ or K+ currents.
    • The reduction in ICa was attributed to changes in channel availability or conductance, not kinetics.
    • Neurotransmitter effects on ICa were observed even when Na+ and K+ currents were blocked.

    Conclusions:

    • Several key neurotransmitters directly modulate calcium channel activity in sensory neurons.
    • This modulation of ICa by neurotransmitters is a significant mechanism influencing neuronal excitability.
    • The findings provide insights into the role of ICa in presynaptic inhibition.