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Summary
This summary is machine-generated.

Hippocampal microstructure changes, detectable with diffusion-weighted imaging, are linked to tau pathology and memory decline in amyloid-positive individuals, suggesting early Alzheimer's disease detection. These microstructural changes fully mediate the relationship between elevated hippocampal mean diffusivity and poorer memory performance.

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Area of Science:

  • Neuroimaging
  • Neurodegeneration
  • Alzheimer's Disease Research

Background:

  • Hippocampal gray matter microstructure, assessed via diffusion-weighted imaging (DWI), shows promise as an early indicator of neurodegeneration in Alzheimer's disease (AD).
  • Microstructural changes in the hippocampus may precede volumetric loss, offering insights into early AD pathogenesis.
  • Understanding these early changes is crucial for timely diagnosis and intervention.

Purpose of the Study:

  • To investigate the relationship between hippocampal microstructure, tau pathology, and episodic memory.
  • To examine the moderating role of amyloid-beta (Aβ) status on these associations.
  • To determine if tau PET burden mediates the link between hippocampal microstructure and memory performance.

Main Methods:

  • The study included 192 participants (14 with mild cognitive impairment) from the BIOCARD cohort, with 52% being Aβ positive.
  • Diffusion-weighted imaging (DWI) assessed hippocampal mean diffusivity (MD).
  • Positron emission tomography (PET) evaluated tau pathology (Braak stages) and Aβ status. Multiple linear regression analyses were employed.

Main Results:

  • Increased hippocampal MD correlated with poorer memory and greater tau PET burden in Braak stages II-IV, but only in amyloid-positive individuals.
  • Amyloid status significantly moderated the association between hippocampal MD, tau burden, and memory.
  • Elevated hippocampal MD was linked to poorer memory, with tau PET burden fully mediating this relationship in amyloid-positive participants.

Conclusions:

  • Hippocampal microstructure is sensitive to AD-related pathological burden and neurodegeneration in the early symptomatic phase.
  • The findings highlight the interplay between hippocampal microstructure, tau pathology, and cognitive decline in AD.
  • These results underscore the potential of DWI for detecting early AD-related changes, particularly in amyloid-positive individuals.