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Area of Science:

  • Neuroscience
  • Cell Biology
  • Neuropathology

Background:

  • Parkinson's disease (PD) involves Lewy pathology in the cerebral cortex, but its impact on cortical circuits is unclear.
  • Alpha-synuclein (αSyn) aggregation is a hallmark of PD, yet its precise role in cortical dysfunction needs elucidation.

Purpose of the Study:

  • To investigate how αSyn pathology disrupts cortical circuit integrity and function in a mouse model of PD.
  • To identify specific cellular and molecular mechanisms underlying cortical dysfunction in Parkinson's disease.

Main Methods:

  • Injected αSyn preformed fibrils (PFFs) into the mouse dorsolateral striatum to induce pathology.
  • Analyzed αSyn aggregate distribution, neuronal excitability, morphology, and channel function in the motor cortex.
  • Assessed thalamocortical transmission following partial dopamine depletion.

Main Results:

  • αSyn aggregates selectively accumulated in specific cortical layers and intratelencephalic neurons (ITNs).
  • αSyn-bearing ITNs exhibited hyperexcitability, altered input resistance and capacitance, linked to impaired HCN channel function.
  • ITNs with αSyn aggregates showed morphological changes, including cell body shrinkage and dendritic spine loss.
  • Partial dopamine depletion did not affect thalamocortical transmission to cortical pyramidal neurons.

Conclusions:

  • αSyn pathology directly impairs cortical circuit function by altering the properties of specific neuronal subtypes.
  • Impaired HCN channel function and morphological changes in ITNs contribute to cortical dysfunction in Parkinson's disease.
  • This study provides a mechanistic understanding of cortical circuit disruption in Parkinson's disease pathogenesis.