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Corticospinal Excitability Modulation During Action Observation
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Published on: December 31, 2013

Hormonal modulation of sensorimotor integration.

Nicholas D DeLong1, Michael P Nusbaum

  • 1Department of Neuroscience, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 19, 2010
PubMed
Summary
This summary is machine-generated.

The hormone crustacean cardioactive peptide (CCAP) weakens sensory neuron (GPR) control over crab chewing rhythms by activating the same cellular pathway as the primary motor neuron (MCN1). This interaction reduces the GPR neuron's ability to regulate the motor circuit.

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Area of Science:

  • Neuroscience
  • Neurophysiology
  • Computational Neuroscience

Background:

  • Neuronal circuits integrate diverse inputs (hormonal, sensory, descending), but their combined effects are often unstudied.
  • The stomatogastric ganglion controls crustacean gastric mill (chewing) rhythm, driven by modulatory inputs like MCN1.
  • The gastropyloric receptor (GPR) proprioceptor and crustacean cardioactive peptide (CCAP) hormone are known modulators of this circuit.

Purpose of the Study:

  • To investigate the integrated action of CCAP and GPR on the crab gastric mill rhythm.
  • To elucidate the mechanisms by which CCAP modulates GPR's influence on the MCN1-driven rhythm.

Main Methods:

  • Experimental manipulations in isolated crab stomatogastric ganglion.
  • Stimulation of GPR proprioceptor neuron.
  • Application of CCAP hormone.
  • Computational modeling and dynamic-clamp techniques to analyze circuit neuron activity.

Main Results:

  • GPR stimulation prolongs the gastric mill retractor phase by inhibiting MCN1.
  • CCAP alone modestly prolongs the protraction phase but does not alter retraction duration.
  • CCAP significantly weakens or eliminates the GPR's effect on the gastric mill rhythm.
  • This occurs because CCAP activates the same modulator-activated conductance (G(MI)) in LG neurons as MCN1, counteracting GPR's effect.

Conclusions:

  • CCAP's activation of G(MI) in downstream neurons diminishes the impact of GPR's modulation of MCN1 activity.
  • Hormonal activation of a shared conductance pathway can override sensory regulation of motor circuits.
  • This study reveals how integrated neuromodulation shapes motor circuit output, demonstrating CCAP's role in reducing sensory influence.