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Distinct globus pallidus circuits regulate motor and cognitive functions.

Asier Aristieta1, Aryn Gittis1

  • 1Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA, USA; Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA.

Trends in Neurosciences
|June 19, 2021
PubMed
Summary

Researchers found two distinct globus pallidus (GPe) pathways linked to specific behaviors. Manipulating these circuits in mice improved motor deficits and cognitive flexibility, offering insights into Parkinsonian conditions.

Keywords:
Parkinson's diseasecognitive functionexternal segment of the globus pallidus (GPe)locomotionparvalbuminreversal learning

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Systems Neuroscience

Background:

  • The globus pallidus (GPe) is a key component of the basal ganglia circuitry.
  • Distinct neuronal pathways within the GPe are increasingly recognized for their roles in motor control and cognition.
  • Dysfunction in basal ganglia pathways is implicated in neurodegenerative disorders like Parkinson's disease.

Purpose of the Study:

  • To identify and characterize distinct behavioral pathways within the globus pallidus.
  • To investigate the role of these GPe pathways in motor and cognitive deficits associated with Parkinsonism.
  • To determine if selective manipulation of GPe circuits can ameliorate Parkinsonian symptoms.

Main Methods:

  • Electrophysiological recordings and optogenetic/chemogenetic manipulations in mouse models.
  • Behavioral assays to assess motor function (e.g., locomotion) and cognitive flexibility.
  • Circuit tracing and analysis to delineate specific neuronal pathways in the GPe.

Main Results:

  • Two discrete pathways within the globus pallidus were identified, each associated with specific behaviors.
  • Dysfunction of these pathways was demonstrated to underlie motor and cognitive deficits in a mouse model of Parkinsonism.
  • Selective activation or inhibition of these identified pathways successfully rescued locomotor deficits and enhanced behavioral flexibility.

Conclusions:

  • The globus pallidus contains functionally distinct circuits that regulate specific behaviors.
  • Targeting these GPe pathways offers a potential therapeutic strategy for motor and cognitive symptoms in Parkinson's disease.
  • This research provides a deeper understanding of basal ganglia circuitry and its role in movement and cognition.