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Updated: Jul 9, 2025

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A multiple hits hypothesis for memory dysfunction in Parkinson disease.

Salvatore Citro1, Giulia Di Lazzaro2, Angelo Tiziano Cimmino1

  • 1Neurology Section, Department of Neuroscience, Università Cattolica del Sacro Cuore, Rome, Italy.

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|December 5, 2023
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Summary
This summary is machine-generated.

Cognitive disorders in Parkinson disease (PD) affect memory. A new tripartite model implicates the hippocampus, striatum, and amygdala, with alpha-synuclein potentially driving memory impairment in PD.

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Area of Science:

  • Neuroscience
  • Neurology
  • Cognitive Science

Background:

  • Cognitive disorders, particularly memory deficits, are common in Parkinson disease (PD).
  • Traditionally, hippocampal and nigrostriatal systems were implicated in memory and executive functions, respectively.
  • Emerging evidence suggests the amygdala's role in emotional processing and its involvement in PD cognitive dysfunction.

Purpose of the Study:

  • To propose a tripartite model of memory dysfunction in Parkinson disease.
  • To explore the anatomo-functional relationships between the hippocampus, striatum, and amygdala in PD.
  • To discuss the role of alpha-synuclein in the pathogenesis of memory disorders in PD.

Main Methods:

  • Review of existing literature on cognitive disorders in Parkinson disease.
  • Analysis of anatomo-functional connections within the proposed tripartite memory system.
  • Discussion of experimental evidence and pathological mechanisms, including alpha-synuclein.

Main Results:

  • The hippocampus, striatum, and amygdala are proposed as key interconnected structures in PD-related memory deficits.
  • Dysfunction in this tripartite system contributes to the cognitive landscape of Parkinson disease.
  • Alpha-synuclein is highlighted as a potential key player in the development of memory impairments.

Conclusions:

  • A tripartite model (hippocampus, striatum, amygdala) offers a comprehensive framework for understanding memory disorders in Parkinson disease.
  • This model integrates emotional and cognitive aspects of memory affected in PD.
  • Targeting alpha-synuclein within this network may hold therapeutic potential for memory dysfunction in PD.