Cited by 309Advanced Neuroimaging Techniques and ApplicationsDementia and Cognitive Impairment ResearchFunctional Brain Connectivity Studies

Fibre-specific white matter reductions in Alzheimer’s disease and mild cognitive impairment

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Mito, Remika, Raffelt, David, Dhollander, Thijs, Vaughan, David N, Tournier, J-Donald, Salvado, Olivier, Brodtmann, Amy, Rowe, Christopher C +2 more·2018·Brain

Abstract

Alzheimer's disease is increasingly considered a large-scale network disconnection syndrome, associated with progressive aggregation of pathological proteins, cortical atrophy, and functional disconnections between brain regions. These pathological changes are posited to arise in a stereotypical spatiotemporal manner, targeting intrinsic networks in the brain, most notably the default mode network. While this network-specific disruption has been thoroughly studied with functional neuroimaging, changes to specific white matter fibre pathways within the brain's structural networks have not been closely investigated, largely due to the challenges of modelling complex white matter structure. Here, we applied a novel technique known as 'fixel-based analysis' to comprehensively investigate fibre tract-specific differences at a within-voxel level (called 'fixels') to assess potential axonal loss in subjects with Alzheimer's disease and mild cognitive impairment. We hypothesized that patients with Alzheimer's disease would exhibit extensive degeneration across key fibre pathways connecting default network nodes, while patients with mild cognitive impairment would exhibit selective degeneration within fibre pathways connecting regions previously identified as functionally implicated early in Alzheimer's disease. Diffusion MRI data from Alzheimer's disease (n = 49), mild cognitive impairment (n = 33), and healthy elderly control subjects (n = 95) were obtained from the Australian Imaging, Biomarkers and Lifestyle study of ageing. We assessed microstructural differences in fibre density, and macrostructural differences in fibre bundle morphology using fixel-based analysis. Whole-brain analysis was performed to compare groups across all white matter fixels. Subsequently, we performed a tract of interest analysis comparing fibre density and cross-section across 11 selected white matter tracts, to investigate potentially subtle degeneration within fibre pathways in mild cognitive impairment, initially by clinical diagnosis alone, and then by including amyloid status (i.e. a positive or negative amyloid PET scan). Our whole-brain analysis revealed significant white matter loss manifesting both microstructurally and macrostructurally in Alzheimer's disease patients, evident in specific fibre pathways associated with default mode network nodes. Reductions in fibre density and cross-section in mild cognitive impairment patients were only exhibited within the posterior cingulum when statistical analyses were limited to tracts of interest. Interestingly, these degenerative changes did not appear to be associated with high amyloid accumulation, given that amyloid-negative, but not positive, mild cognitive impairment subjects exhibited subtle focal left posterior cingulum deficits. The findings of this study demonstrated a stereotypical distribution of white matter degeneration in patients with Alzheimer's disease, which was in line with canonical findings from other imaging modalities, and with a network-based conceptualization of the disease.awx355media15726254535001.

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  • DTI alterations observed in the corticospinal tract in the current study cannot be unambiguously attributed to that tract and may be due to alterations in crossing fibres such as the superior longitudinal fasciculus or corpus callosum.

    “DTI alterations such as those observed in the corticospinal tract in the current study should be interpreted with caution, as the current TBSS approach cannot be unambiguously attributed to that tract, but potentially are because of alterations in crossing fibres such as the superior longitudinal fasciculus or corpus callosum (Douaud et al., 2011; Teipel et al., 2014; Mito et al., 2018).”

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Research works printed but not linked: 5

  1. Dhollander T, Connelly A. A novel iterative approach to reap the benefits of multi-tissue CSD from just single-shell ( + b = 0) diffu- sion MRI data. In: 24th International Society of Magnetic Resonance in Medicine, vol. 24. Singapore; 2016, p. 3010.
  2. Dhollander T, Raffelt D, Connelly A. Towards interpretation of 3- tissue constrained spherical deconvolution results in pathology. In: 25th International Society of Magnetic Resonance in Medicine, vol. 25. Honolulu, Hawaii; 2017, p. 1815.
  3. Dhollander T, Raffelt D, Connelly A. Unsupervised 3-tissue response function estimation from single-shell or multi-shell diffusion MR data without a co-registered T1 image. Proceedings of ISMRM Workshop on Breaking the Barriers of Diffusion MRI. Lisbon, Portugal; 2016, p.
  4. Englund E, Brun A, Alling C. White matter changes in dementia of Alzheimer's type. Brain 1988; 111: 1425-39.
  5. Mintun MA, Larossa GN, Sheline YI, Dence CS, Lee SY, Mach RH, et al. [11C] PIB in a nondemented population Potential antecedent marker of Alzheimer disease. Neurology 2006; 67: 446-52.

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Authors
Mito, R., Raffelt, D., Dhollander, T., Vaughan, D. N., Tournier, J.-D., Salvado, O., Brodtmann, A., Rowe, C. C., Villemagne, V. L., & Connelly, A.
Affiliations
  • The University of Melbourne (AU)
  • Florey Institute of Neuroscience and Mental Health (AU)
  • King's College London (GB)
  • Australian e-Health Research Centre (AU)
  • Box Hill Hospital (AU)
Corresponding author
Mito, Remika
Venue
Brain
Published
2018-01-04
Volume
141
Issue
3
Pages
888-902
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W2781581970
Cited by
309
References
106
Citations by year
2026: 34 · 2025: 37 · 2024: 33 · 2023: 41 · 2022: 46 · 2021: 53 · 2020: 36 · 2019: 18 · 2018: 10
FWCI
13.42
Type
journal article
Language
en
Open access
Locations
  • Brain (publishedVersion)
  • PubMed (publishedVersion)
  • Research Portal (King's College London) (submittedVersion, other-oa)
Funders
  • National Health and Medical Research Council
  • NHMRC Research Fellowship (1046571)
  • University of Melbourne
  • Yulgibar Alzheimer’s Research Program Award
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
Keywords
Alzheimer's disease, mild cognitive impairment, white matter degeneration, fixel-based analysis, default mode network, posterior cingulum, amyloid PET, fiber density, fiber cross-section, white matter microstructure, network disconnection, axonal loss, diffusion MRI, brain aging, amyloid
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Aniline Compounds, Brain, Cross-Sectional Studies, Female, Humans, Male, Mental Status Schedule, Nerve Fibers, Thiazoles, Imaging, Three-Dimensional, Positron-Emission Tomography, Cognitive Dysfunction, White Matter

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