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Basic Science and Pathogenesis.

Tengfei Li1, Xifeng Wang1, Martin Cole2

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Summary
This summary is machine-generated.

Amyloid-beta (Aβ) impacts cognitive decline in Alzheimer's Disease (AD) partly through changes in brain structural connectivity, specifically fractional anisotropy (FA) in visual, default mode (DMN), and frontoparietal (FPN) networks.

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Area of Science:

  • Neuroimaging
  • Neuroscience
  • Alzheimer's Disease Research

Background:

  • Alzheimer's Disease (AD) is characterized by cognitive decline.
  • Amyloid-beta (Aβ) accumulation is a key pathological hallmark of AD.
  • Brain structural connectivity alterations may mediate Aβ's effects on cognition.

Purpose of the Study:

  • To investigate how brain structural connectivity mediates the impact of Aβ on cognitive decline in AD.
  • To identify specific brain networks and pathways involved in this mediation process.

Main Methods:

  • Utilized fibertracking tractography and fiber clustering on the ADNI2 dataset.
  • Computed mean fractional anisotropy (FA) and analyzed associations with CSF Aβ42 and cognitive scores (MMSE).
  • Employed linear mixed models and FDR-adjusted mediation analyses, controlling for confounders.

Main Results:

  • 16 fibers showed mediation of Aβ's effect on MMSE, primarily within visual, DMN, and FPN networks.
  • Aβ positively associated with FA in DMN or FPN-related fibers during early AD phases.
  • FA changes mediated 21.6% of Aβ's impact on cognitive decline.

Conclusions:

  • Brain structural connectivity, particularly FA within visual, DMN, and FPN networks, partially mediates Aβ's effect on cognitive decline in AD.
  • DMN and FPN connectivity are notably susceptible in the early stages of AD.