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Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
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Amyloid-β: a potential link between epilepsy and cognitive decline.

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Area of Science:

  • Neuroscience
  • Neurology
  • Pathology

Background:

  • Late-onset epilepsy is associated with an increased risk of dementia.
  • Seizures are observed in early stages of Alzheimer disease (AD), suggesting an epileptic AD prodrome.
  • The relationship between epilepsy and cognitive decline is debated, with uncertainty regarding causality and shared underlying mechanisms.

Purpose of the Study:

  • To review evidence linking amyloid-beta (Aβ) to a shared pathway between epilepsy and cognitive decline, particularly in AD.
  • To explore the hypothesis that Aβ mediates a continuum from epilepsy to cognitive decline.
  • To discuss the potential of Aβ assessment and cognitive testing for risk stratification in late-onset epilepsy.

Main Methods:

  • Literature review of studies on epilepsy, cognitive decline, and amyloid-beta (Aβ) pathology.
  • Examination of experimental evidence for Aβ-mediated epileptogenic alterations.
  • Discussion of clinical observations and hypotheses regarding the Aβ-epilepsy-dementia continuum.

Main Results:

  • Individuals with epilepsy exhibit increased brain Aβ pathology.
  • Aβ-mediated alterations can promote epileptogenesis, potentially starting at the soluble stage before plaque formation.
  • Aβ is proposed as a key factor in the continuum of epilepsy and cognitive decline.

Conclusions:

  • Amyloid-beta (Aβ) may represent a shared pathway linking epilepsy and cognitive decline, especially in Alzheimer disease (AD).
  • Early assessment of Aβ levels and cognitive function in late-onset epilepsy could aid dementia risk stratification.
  • Late-onset epilepsy patients may be a suitable cohort for testing preventive strategies against cognitive decline.