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Related Experiment Video

Updated: Nov 5, 2025

Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
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Cell Type-Specific Decrease of the Intrinsic Excitability of Motor Cortical Pyramidal Neurons in Parkinsonism.

Liqiang Chen1, Samuel Daniels1, Yerim Kim1

  • 1Department of Neurodegenerative Science, Van Andel Institute, Grand Rapids, Michigan 49503.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 19, 2021
PubMed
Summary

Parkinson's disease (PD) reduces motor cortex neuron excitability, specifically in pyramidal tract neurons (PTNs), impacting motor control. This cell-specific adaptation in motor cortex neurons offers new insights into PD pathophysiology.

Keywords:
Parkinson's diseasebasal gangliadopamineelectrophysiologyintrinsic plasticitymotor cortex

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Neurodegenerative Diseases

Background:

  • Parkinson's disease (PD) is characterized by hypokinetic motor symptoms linked to reduced motor cortical output due to basal ganglia dysfunction.
  • The precise cellular alterations in motor cortical neurons following dopamine (DA) loss in PD remain unclear.

Purpose of the Study:

  • To investigate how the loss of dopamine affects the intrinsic cellular properties of motor cortical neurons in a mouse model of Parkinson's disease.
  • To determine if motor cortical neuron adaptations contribute to motor deficits in Parkinson's disease.

Main Methods:

  • Induced parkinsonism in mice using 6-hydroxydopamine (6-OHDA) neurotoxin.
  • Utilized ex vivo patch-clamp recordings and retrograde tracing to analyze motor cortical neurons.
  • Examined intrinsic excitability, action potential properties, and firing capabilities of specific neuron types.

Main Results:

  • Parkinsonism significantly decreased intrinsic excitability in layer 5b pyramidal tract neurons (PTNs) of the primary motor cortex (M1), but not intratelencephalic neurons (ITNs).
  • PTNs showed a depolarized action potential threshold and broadened action potential width, impairing high-frequency firing.
  • Impaired function of persistent sodium and large conductance calcium-activated potassium channels contributed to reduced excitability; acute dopaminergic receptor activation did not rescue these deficits.

Conclusions:

  • Demonstrated a cell type-specific decrease in M1 pyramidal neuron excitability in parkinsonism.
  • Intrinsic adaptations in motor cortex neurons represent a novel mechanism contributing to motor deficits in Parkinson's disease.
  • Findings provide new insights into the pathophysiology of motor symptoms in Parkinson's disease beyond traditional models.