Cited by 73Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsNeurobiology of Language and Bilingualism

Atrophy in Alzheimer's disease and semantic dementia: an ALE meta-analysis of voxel-based morphometry studies

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Chapleau, Marianne, Aldebert, Joséphine, Montembeault, Maxime, Brambati, Simona M.·2016·Journal of Alzheimer's Disease

Abstract

BACKGROUND/OBJECTIVES: Alzheimer's disease (AD) and semantic dementia (SD) have distinct episodic memory profiles despite the hippocampal atrophy that characterizes both diseases. The aim of this study was to delineate the pattern of gray matter (GM) atrophy associated with AD and SD as well as any differences in these patterns by pooling together the results of previous voxel-based morphometry (VBM) studies.Methods/Overview: We conducted a meta-analysis of VBM studies that investigated GM atrophy in AD patients versus controls (CTRLs) and in SD patients versus CTRLs using the activation likelihood estimation (ALE) approach. Our systematic review allowed us to identify 63 VBM studies. RESULTS: The results confirmed that in addition to the classical cortical pattern of atrophy involving posterior medial and lateral regions in AD and the anterior lateral temporal lobes in SD, both AD and SD patients are characterized by bilateral atrophy of the hippocampus. Furthermore, in SD, the hippocampal atrophy was limited to the anterior portion of the hippocampus, while in AD, both the anterior and posterior parts of the hippocampus exhibited atrophy. When we compared the foci identified in the studies that compared AD patients versus CTRLs with those identified in the studies that compared SD patients versus CTRLs, we observed that the atrophy in the posterior hippocampus and precuneus was more severe in AD. CONCLUSION: These results support theories that propose that the deficits observed in AD result from damage to the episodic memory network, which involves the posterior hippocampus and posterior medial brain regions. However, sparing of the posterior hippocampus in SD could explain the absence of episodic memory deficits in this population.

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  • This different pattern of results in bvFTD and AD may reflect the preferential and widespread damage within the AIN in bvFTD whereas in AD, AIN damage appears to be more circumscribed.

    “This different pattern of results in bvFTD and AD may reflect the preferential and widespread damage within the AIN in bvFTD11,14,16, 17, 18, 19, 20,24 whereas in AD, AIN damage appears to be more circumscribed.17,38,88”

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Authors
Chapleau, M., Aldebert, J., Montembeault, M., & Brambati, S. M.
Affiliations
  • Institut Universitaire de Gériatrie de Montréal (CA)
  • Université de Montréal (CA)
Venue
Journal of Alzheimer's Disease
Published
2016-10-04
Volume
54
Issue
3
Pages
941-955
ISSN
  • 1387-2877 (ISSN-L)
  • 1875-8908
OpenAlex
W2513226720
Cited by
73
References
109
Citations by year
2026: 3 · 2025: 7 · 2024: 8 · 2023: 8 · 2022: 8 · 2021: 8 · 2020: 12 · 2019: 10 · 2018: 6 · 2017: 3
FWCI
0.90
Type
journal article
Language
en
Open access
Locations
  • Journal of Alzheimer s Disease (publishedVersion)
  • PubMed (publishedVersion)
  • Papyrus : Institutional Repository (Université de Montréal) (submittedVersion)
Funders
Alzheimer's Society
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neurobiology of Language and Bilingualism
Keywords
Alzheimer's disease, semantic dementia
MeSH terms
Alzheimer Disease, Atrophy, Brain, Humans, Nerve Net, Neuropsychological Tests, Frontotemporal Dementia, Memory, Episodic

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