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Basic Science and Pathogenesis.

Kevin R Shen1, George C Shum1, Abby C Woods1

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Alzheimer's disease involves amyloid-beta (Aβ) and tau pathology. This study reveals how Aβ42 interacts with ACAT1 to alter cholesterol, ER structure, and tau dynamics, uncovering a novel AD pathway.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Alzheimer's disease (AD) is linked to amyloid-beta (Aβ) and tau pathology, but their interaction and the role of cholesterol dyshomeostasis are unclear.
  • Cholesterol homeostasis is regulated at the endoplasmic reticulum (ER), involving ACAT1 enzyme and ER-microtubule contacts crucial for memory.
  • The functional link between ACAT1, Aβ, ER cholesterol, ER structure, and tau dynamics in AD remains uninvestigated.

Purpose of the Study:

  • To uncover a novel mechanistic pathway connecting cholesterol turnover, Aβ function, and tau aggregation in Alzheimer's disease.
  • To investigate the role of ER cholesterol in modulating ER ultrastructure, dynamics, and ER-microtubule contact sites.
  • To determine how Aβ42 and Aβ40 interact with ACAT1 and influence downstream tau pathology.

Main Methods:

  • Utilized super-resolution live Lattice SIM2 microscopy to visualize ER dynamics and ER-microtubule contact sites.
  • Examined the impact of Aβ generation and specific Aβ42/Aβ40 ratios on ER cholesterol turnover and ER sphere formation.
  • Conducted in silico structural multimer modeling of Aβ interactions with ACAT1 and investigated STIM1-EB mediated tethering.

Main Results:

  • Accumulation of ER cholesterol induced novel ER sphere formation, which was also triggered by Aβ generation inhibition.
  • Aβ42, but not Aβ40, structurally interacted with ACAT1, promoting cholesterol turnover and reducing ER sphere formation.
  • ER cholesterol accumulation led to the untethering of ER-microtubule contacts, causing tau dissociation and oligomerization.

Conclusions:

  • Provides evidence for a unifying mechanism linking Aβ function with tau dynamics via cholesterol-mediated ER dynamics.
  • Identifies a novel cellular pathway involving ACAT1 and ER cholesterol turnover in Alzheimer's disease pathogenesis.
  • Highlights the critical role of ER cholesterol in regulating ER structure and microtubule-associated tau pathology.