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Parkinson disease (PD) involves Lewy pathology in the brain. This study shows alpha-synuclein aggregation in motor cortex neurons causes hyperexcitability, contributing to PD

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Area of Science:

  • Neuroscience
  • Neuropathology
  • Movement Disorders

Background:

  • Cerebral cortex dysfunction contributes to motor and cognitive deficits in Parkinson disease (PD).
  • The precise mechanisms by which Lewy pathology disrupts cortical circuits and interacts with dopaminergic degeneration in PD remain unclear.
  • Investigating cortical Lewy pathology is crucial for understanding PD pathogenesis.

Purpose of the Study:

  • To investigate how alpha-synuclein (αSyn) aggregation impacts cortical circuit integrity and function in a mouse model of Parkinson disease (PD).
  • To determine the specific effects of αSyn pathology on different neuronal subtypes within the motor cortex.
  • To explore the relationship between cortical αSyn deposition and midbrain dopaminergic neuron degeneration in PD.

Main Methods:

  • Injection of α-synuclein (αSyn) preformed fibrils (PFFs) into the dorsolateral striatum of mice to induce pathology.
  • Analysis of αSyn aggregate distribution in specific cortical layers and neuronal subtypes (intratelencephalic neurons [ITNs] and corticospinal neurons [CSNs]).
  • Electrophysiological recordings to assess neuronal intrinsic excitability, input resistance, and morphological changes (somatic size, dendritic spines).

Main Results:

  • αSyn aggregates preferentially accumulated in ITNs compared to CSNs within the motor cortex.
  • αSyn-laden ITNs exhibited increased intrinsic excitability and input resistance, alongside somatic shrinkage and dendritic spine loss.
  • Midbrain dopaminergic neuron degeneration and associated striatal dopamine depletion did not alter CSN intrinsic excitability or thalamocortical inputs.

Conclusions:

  • αSyn aggregation in motor cortex neurons leads to neuronal hyperexcitability, offering a new mechanism for cortical dysfunction in Parkinson disease (PD).
  • The findings highlight a cell-type-specific vulnerability of cortical neurons to αSyn pathology.
  • This study provides a mechanistic link between Lewy pathology and cortical circuit disruption in PD.