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Basic Science and Pathogenesis.

Klara Gawor1, Sam Verrept1, Geethika Arekatla2

  • 1Laboratory of Neuropathology, KU Leuven, Leuven, Belgium.

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|December 24, 2025
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Summary
This summary is machine-generated.

Hippocampal damage in dementia is multifactorial, involving more than just Alzheimer's disease (AD) and tau pathology. Limbic-predominant age-related TDP-43 encephalopathy neuropathologic changes (LATE-NC) are a key driver of neuronal loss, influenced by the APOE ε4 allele.

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Area of Science:

  • Neuroscience
  • Neuropathology
  • Gerontology

Background:

  • The hippocampus is vulnerable in neurodegenerative diseases.
  • Alzheimer's disease (AD) and Limbic-Predominant Age-Related TDP-43 Encephalopathy Neuropathologic Changes (LATE-NC) contribute to hippocampal damage.
  • APOE ε4 allele exacerbates age-related lesions and dementia risk.

Purpose of the Study:

  • Quantify CA1 neuronal density in relation to various neuropathologies.
  • Investigate the interplay of pathologies driving hippocampal degeneration.
  • Determine the influence of APOE ε4 on neuropathologic changes.

Main Methods:

  • Analysis of 480 post-mortem brains (ages 50-99).
  • Algorithm-based quantification of CA1 neuronal density.
  • Assessment of neuropathologic lesions (Aβ, tau, LATE-NC, α-synuclein, CAA, etc.) and APOE genotyping.

Main Results:

  • ADNC, LATE-NC, α-synuclein, small vessel disease, and atherosclerosis contribute to CA1 neuronal loss.
  • Tau, LATE-NC, and α-synuclein are primary drivers of hippocampal neuronal degeneration.
  • APOE ε4 influences Aβ, capillary CAA, and LATE-NC.

Conclusions:

  • Hippocampal damage in dementia is multifactorial, with LATE-NC playing a central role.
  • APOE ε4 indirectly drives hippocampal degeneration via Aβ and comorbid pathology interactions.
  • Findings extend beyond traditional AD and tau focus in hippocampal aging research.