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Area of Science:

  • Neuroscience
  • Neuropathology
  • Parkinsons Disease Research

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 function, especially in interaction with dopaminergic degeneration, remain unclear.
  • Understanding cortical involvement is crucial for developing targeted PD therapies.

Purpose of the Study:

  • To investigate how alpha-synuclein (αSyn) pathology affects cortical circuit integrity and neuronal function in a mouse model of Parkinson disease.
  • To determine the specific patterns of αSyn aggregate accumulation in the motor cortex and their impact on different neuronal subtypes.
  • To elucidate the relationship between cortical αSyn pathology and midbrain dopaminergic neuron degeneration in disrupting cortical function.

Main Methods:

  • Injection of alpha-synuclein (αSyn) preformed fibrils (PFFs) into the dorsolateral striatum of mice to induce pathology.
  • Analysis of αSyn aggregate deposition in specific layers and cell subtypes within the motor cortex.
  • Electrophysiological recordings and morphological analyses of intratelencephalic neurons (ITNs) and corticospinal neurons (CSNs).

Main Results:

  • αSyn aggregates accumulated in a layer- and cell-subtype-specific manner in the motor cortex, with earlier and more extensive deposition in intratelencephalic neurons (ITNs) compared to corticospinal neurons (CSNs).
  • αSyn-bearing ITNs in the secondary motor cortex (M2) exhibited increased intrinsic excitability and input resistance, alongside cell body shrinkage and dendritic spine loss.
  • Neither CSN intrinsic excitability nor their thalamocortical input was affected by the associated striatal dopamine depletion.

Conclusions:

  • Cortical αSyn aggregation leads to neuronal hyperexcitability, particularly in ITNs, offering a novel mechanistic insight into cortical circuit dysfunction in Parkinson disease.
  • The findings highlight a distinct pathway of cortical pathology independent of significant dopaminergic depletion effects on specific neuronal populations.
  • This study provides a foundation for understanding how Lewy pathology directly impacts cortical function in PD pathogenesis.