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Alzheimer's Imaging Consortium.

David A Hoagey1, Nicole S McKay2, Qing Wang3

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Summary
This summary is machine-generated.

This study shows how amyloid and tau proteins impact brain structure in Alzheimer's disease (AD). Diffusion MRI reveals distinct regional effects of amyloid and tau, offering early biomarkers for neurodegeneration.

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Area of Science:

  • Neuroimaging
  • Neuropathology
  • Biomarker Discovery

Background:

  • Alzheimer's disease (AD) staging involves amyloid and tau progression, but their regional impact on neurodegeneration is debated.
  • Diffusion MRI detects microstructural changes, aiding in early AD detection and subtype differentiation.
  • This study investigates the relationship between regional amyloid and tau deposition and diffusion metrics at the gray/white matter interface.

Purpose of the Study:

  • To analyze the impact of regional amyloid and tau burden on diffusion MRI metrics.
  • To assess microstructural changes in neuronal health related to protein deposition in Alzheimer's disease.
  • To explore the potential of diffusion imaging as an early indicator of neurodegenerative processes.

Main Methods:

  • Utilized data from 354 participants from the Knight Alzheimer Disease Research Center.
  • Processed T1-weighted, diffusion MRI, and amyloid/tau PET imaging data.
  • Employed general linear models to assess regional effects of amyloid and tau Standardized Uptake Value Ratio (SUVR) on Fractional Anisotropy (FA) values.

Main Results:

  • Amyloid burden showed broad effects on diffusion, increasing FA in frontal, parietal, and superior temporal cortices, mirroring typical amyloid deposition patterns.
  • Tau accumulation demonstrated a focused impact, decreasing FA in medial temporal, occipital, and lateral frontal areas, consistent with tau spread patterns.
  • Regionally differential effects of amyloid and tau on FA were observed, highlighting distinct microstructural impacts.

Conclusions:

  • Diffusion imaging metrics are strongly associated with the spread of amyloid and tau biomarkers in Alzheimer's disease.
  • Observed regional patterns in diffusion metrics correlate with the known spread of amyloid and tau in early AD stages.
  • These findings suggest diffusion MRI can serve as an early indicator of myelin integrity or cytoarchitectural changes, improving biomarker specificity for neurodegeneration.