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Primary progressive aphasia (PPA) shows distinct amygdala nucleus vulnerabilities. The basal nucleus had the most neuronal loss and tau pathology, with differences seen in 3R vs. 4R tau species.

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Area of Science:

  • Neuroscience
  • Neuropathology
  • Dementia Research

Background:

  • Primary progressive aphasia (PPA) is a language disorder often linked to frontotemporal lobar degeneration with tau pathology (FTLD-tau).
  • The amygdala, a brain region crucial for emotion and memory, exhibits differential vulnerability in neurodegenerative diseases.
  • This study examines how specific amygdala nuclei are affected in PPA caused by different tau species (3R vs. 4R FTLD-tau).

Purpose of the Study:

  • To investigate distinct patterns of pathogenesis in amygdala nuclei in PPA.
  • To differentiate the effects of 3R and 4R tau species on amygdala nuclei in PPA.
  • To explore the role of the amygdala in PPA pathogenesis.

Main Methods:

  • Autopsy-confirmed PPA cases (3R and 4R FTLD-tau) and controls were analyzed.
  • Amygdala sections were stained for neurons and phosphorylated tau (AT-8).
  • Stereological quantification of neurons and tau inclusions, and digital analysis of tau immunopositivity were performed in specific amygdala nuclei.

Main Results:

  • The basal nucleus showed significant neuronal loss and the highest tau pathology in PPA cases.
  • PPA with 3R tau exhibited more widespread tau accumulation and lateral nucleus neuronal loss compared to 4R tau.
  • PPA with 4R tau showed greater glial tau accumulation, particularly in the central nucleus, and leftward asymmetry of pathology.

Conclusions:

  • Amygdala nuclei display distinct vulnerabilities in PPA related to FTLD-tau.
  • The basal nucleus is consistently affected by neuronal loss and tau pathology in PPA.
  • Different tau species (3R vs. 4R) lead to unique pathological patterns within the amygdala, including hemispheric asymmetry.