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Related Experiment Videos

Modulators with convergent cellular actions elicit distinct circuit outputs.

A M Swensen1, E Marder

  • 1Volen Center and Biology Department, Brandeis University, Waltham, Massachusetts 02454, USA. andrew_swensen@hms.harvard.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 23, 2001
PubMed
Summary

Six neuromodulators target the same ion current but affect crab pyloric rhythms differently. Differential receptor distribution on neurons explains these distinct motor pattern effects.

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Area of Science:

  • Neuroscience
  • Comparative Physiology
  • Marine Biology

Background:

  • Neuromodulators play crucial roles in shaping neural circuit function.
  • The stomatogastric ganglion (STG) in crustaceans is a model system for studying neural control of rhythmic behaviors.
  • Six identified neuromodulators converge on a common ion current in STG neurons.

Purpose of the Study:

  • To investigate whether differential neuronal targets explain the distinct effects of neuromodulators on the pyloric rhythm.
  • To compare the motor patterns produced by proctolin and crustacean cardioactive peptide (CCAP).

Main Methods:

  • Systematic comparison of motor patterns induced by proctolin and CCAP in crab STG neurons.
  • Utilizing dynamic clamp to introduce artificial currents into specific neurons.

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  • Electrophysiological recordings to analyze neuronal activity and network rhythms.

    • Main Results:

    • Proctolin and CCAP exhibit differential effects on pyloric network neurons, despite acting on the same inward current.
    • Proctolin targets a broader range of neurons, including pyloric dilator (PD) and pyloric (PY) neurons, compared to CCAP.
    • Artificial introduction of a proctolin-like current into PD and PY neurons during CCAP application mimicked proctolin-induced rhythms.

    Conclusions:

    • Differential receptor distribution on distinct neuronal subsets is the primary driver of varied neuromodulator effects on the pyloric rhythm.
    • This study highlights the importance of neuronal targeting in mediating neuromodulatory control of neural circuits.