Cited by 272Dementia and Cognitive Impairment ResearchAdvanced Neuroimaging Techniques and ApplicationsAlzheimer's disease research and treatments

Multiple DTI index analysis in normal aging, amnestic MCI and AD. Relationship with neuropsychological performance

Bosch, Beatriz, Arenaza-Urquijo, Eider M., Rami, Lorena, Sala-Llonch, Roser, Junqué, Carme, Solé-Padullés, Cristina, Peña-Gómez, Cleofé, Bargalló, Núria +2 more·2012·Neurobiology of Aging

Abstract

White matter (WM) damage has been reported in Alzheimer's Disease (AD) and Mild Cognitive Impairment (MCI) in diffusion tensor imaging (DTI) studies. It is, however, unknown how the investigation of multiple tensor indexes in the same patients, can differentiate them from normal aging or relate to patients cognition. Forty-six individuals (15 healthy, 16 a-MCI and 15 AD) were included. Voxel-based tract based spatial-statistics (TBSS) was used to obtain whole-brain maps of main WM bundles for fractional anisotropy (FA), radial diffusivity (DR), axial diffusivity (DA) and mean diffusivity (MD). FA reductions were evidenced among AD patients with posterior predominance. A-MCI patients displayed reduced mean FA in these critical regions, compared to healthy elders. MD increases were widespread in both groups of patients. Interestingly, a-MCI patients exhibited DR increases in overlapping areas of FA shrinkages in AD, whereas DA increases were only observed in AD. Gray matter atrophy explained most DTI differences, except those regarding MD in both groups as well as DR increases in posterior associative pathways among a-MCI cases. FA values were the only DTI measure significantly related to memory performance among patients. Present findings suggest that most DTI-derived changes in AD and a-MCI are largely secondary to gray matter atrophy. Notably however, specific DR signal increases in posterior parts of the inferior fronto-occipital and longitudinal fasciculi may reflect early WM compromise in preclinical dementia, which is independent of atrophy. Finally, global measures of integrity, particularly orientation coherence (FA) of diffusion, appear to be more closely related to the cognitive profile of our patients than indexes reflecting water movement parallel (DA) and perpendicular (DR) to the primary diffusion direction.

Integrity signals

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Crossref · 10.1016/j.neurobiolaging.2010.02.004

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  • An increase in axial diffusivity was observed, albeit in a spatially more restricted manner when compared to that of the other DTI indices.

    “Consistent with previous studies in mild cognitive impairment (O’Dwyer et al., 2012) and Alzheimer’s disease dementia (Acosta-Cabronero et al., 2010, 2012; Bosch et al., 2012), we observed an increase in axial diffusivity, albeit in a spatially more restricted manner when compared to that of the other DTI indices.”
  • Hyperphosphorylated tau becomes dissociated from microtubules, leading to impairment of axonal transport and appearance of dystrophic axons.

    “Hyperphosphorylated tau becomes dissociated from microtubules, leading to impairment of axonal transport and appearance of dystrophic axons 8–11.”

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Authors
Bosch, B., Arenaza-Urquijo, E. M., Rami, L., Sala-Llonch, R., Junqué, C., Solé-Padullés, C., Peña-Gómez, C., Bargalló, N., Molinuevo, J. L., & Bartrés-Faz, D.
Affiliations
  • Hospital Clínic de Barcelona (ES)
  • Consorci Institut D'Investigacions Biomediques August Pi I Sunyer (ES)
  • Universitat de Barcelona (ES)
Venue
Neurobiology of Aging
Publisher
Elsevier BV
Published
2012-01
Volume
33
Issue
1
Pages
61-74
ISSN
0197-4580 (ISSN-L)
OpenAlex
W2002665706
Cited by
272
References
82
Citations by year
2026: 5 · 2025: 14 · 2024: 7 · 2023: 12 · 2022: 10 · 2021: 11 · 2020: 7 · 2019: 16 · 2018: 19 · 2017: 18 · 2016: 21 · 2015: 26 · 2014: 19 · 2013: 38 · 2012: 23
FWCI
18.76
Type
journal article
Language
en
Open access
closed
Locations
  • Neurobiology of Aging (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Spanish Ministerio de Educación y Ciencia research project award (SAF2007-66,270)
  • Spanish Ministerio de Ciencia e Innovación (SAF2009-07,489)
  • Generalitat de Catalunya to the Neuropsychology Research Group (2009SGR941)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
Alzheimer's disease, amnestic mild cognitive impairment, normal aging, white matter integrity, fractional anisotropy, radial diffusivity, axial diffusivity, mean diffusivity, gray matter atrophy, memory performance, tract-based spatial statistics, inferior fronto-occipital fasciculus, longitudinal fasciculus, preclinical dementia, white matter microstructure
MeSH terms
Aged, Aged, 80 and over, Aging, Alzheimer Disease, Atrophy, Brain Mapping, Cerebral Cortex, Cognition, Female, Humans, Male, Memory, Neuropsychological Tests, Prospective Studies, Anisotropy, Diffusion Tensor Imaging, Cognitive Dysfunction

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