Abstract:
:Beginning in the early stages of Alzheimer's disease (AD), the hippocampus reduces its functional connections to other cortical regions due to synaptic depletion. However, little is known regarding connectivity abnormalities within the hippocampus. Here, we describe rostral-caudal hippocampal convergence (rcHC), a metric of the overlap between the rostral and caudal hippocampal functional networks, across the clinical spectrum of AD. We predicted a decline in rostral-caudal hippocampal convergence in the early stages of the disease. Using fMRI, we generated resting-state hippocampal functional networks across 56 controls, 48 early MCI (EMCI), 35 late MCI (LMCI), and 31 AD patients from the Alzheimer's Disease Neuroimaging Initiative cohort. For each diagnostic group, we performed a conjunction analysis and compared the rostral and caudal hippocampal network changes using a mixed effects linear model to estimate the convergence and differences between these networks, respectively. The conjunction analysis showed a reduction of rostral-caudal hippocampal convergence strength from early MCI to AD, independent of hippocampal atrophy. Our results demonstrate a parallel between the functional convergence within the hippocampus and disease stage, which is independent of brain atrophy. These findings support the concept that network convergence might contribute as a biomarker for connectivity dysfunction in early stages of AD.
journal_name
Mol Neurobioljournal_title
Molecular neurobiologyauthors
Therriault J,Wang S,Mathotaarachchi S,Pascoal TA,Parent M,Beaudry T,Shin M,Al B,Kang MS,Ng KP,Dansereau C,Park MTM,Fonov V,Carbonell F,Zimmer E,Chakravarty MM,Bellec P,Gauthier S,Rosa-Neto P,Alzheimer’s Disease Neurdoi
10.1007/s12035-019-01671-0subject
Has Abstractpub_date
2019-12-01 00:00:00pages
8336-8344issue
12eissn
0893-7648issn
1559-1182pii
10.1007/s12035-019-01671-0journal_volume
56pub_type
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