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Related Experiment Videos

Acetylcholine responses in snail neurons: increase and decrease in potassium conductance succeeding inward currents.

O W Witte, J Walden, E J Speckmann

    Brain Research
    |November 18, 1985
    PubMed
    Summary
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    Acetylcholine (ACh) triggers distinct secondary currents in Helix pomatia neurons. These currents involve potassium (K+) efflux and sodium (Na+) influx, influencing neuronal excitability.

    Area of Science:

    • Neuroscience
    • Cellular Electrophysiology

    Background:

    • Neurons B1 and B3 in the buccal ganglion of Helix pomatia are crucial for feeding behavior.
    • Acetylcholine (ACh) is a key neurotransmitter in the gastropod nervous system.

    Purpose of the Study:

    • To investigate the nature of secondary currents following acetylcholine application in Helix pomatia neurons.
    • To elucidate the ionic mechanisms underlying these secondary responses.

    Main Methods:

    • Electrophysiological recordings (voltage-clamp) were performed on identified neurons B1 and B3.
    • Ionic substitutions (Ca2+-free, Co2+ solutions) and ion injections (Na+) were used to probe current mechanisms.

    Main Results:

    • Acetylcholine (ACh) elicited secondary outward and/or inward currents.

    Related Experiment Videos

  • The outward current, dependent on Ca2+ influx, was reduced by hyperpolarization and abolished in Ca2+-free Co2+ solution, suggesting a K+ current.
  • The inward current, associated with increased membrane resistance and mimicked by Na+ injection, was reduced by hyperpolarization, suggesting a Na+-mediated block of K+ channels.

    • Conclusions:

    • Two distinct secondary currents, one outward (K+-mediated, Ca2+-dependent) and one inward (Na+-mediated, K+ channel block), follow ACh stimulation.
    • These currents modulate neuronal excitability and contribute to the complex electrical behavior of Helix pomatia buccal neurons.