Journal
ONCOTARGET
Volume 7, Issue 36, Pages 57556-57570Publisher
IMPACT JOURNALS LLC
DOI: 10.18632/oncotarget.11353
Keywords
Alzheimer's disease; 5XFAD mice; cognition; neuroimaging; manganese enhanced MRI; Pathology Section
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Funding
- National Natural Science Foundation of China [91232707, 81420108012]
- National Major Science and Technology Program of China [2012ZX09506-001-009]
- Key Program for Clinical Medicine and Science and Technology, Jiangsu Provincial Clinical Medical Research Center [BL2013025]
- National High-tech R.D Program (863 Program) [2015AA020508]
- National Basic Research Program of China [2013CB835103]
- Strategic Priority Research Program of Chinese Academy of Science [XDB02020002]
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Dysfunction of neuronal activity is a major and early contributor to cognitive impairment in Alzheimer's disease (AD). To investigate neuronal activity alterations at early stage of AD, we encompassed behavioral testing and in vivo manganese-enhanced magnetic resonance imaging (MEMRI) in 5XFAD mice at early ages (1-, 2-, 3-and 5-month). The 5XFAD model over-express human amyloid precursor protein (APP) and presenilin 1 (PS1) harboring five familial AD mutations, which have a high APP expression correlating with a high burden and an accelerated accumulation of the 42 amino acid species of amyloid-beta. In the Morris water maze, 5XFAD mice showed longer escape latency and poorer memory retention. In the MEMRI, 5XFAD mice showed increased signal intensity in the brain regions involved in spatial cognition, including the entorhinal cortex, the hippocampus, the retrosplenial cortex and the caudate putamen. Of note, the observed alterations in spatial cognition were associated with increased MEMRI signal intensity. These findings indicate that aberrant increased basal neuronal activity may contribute to the spatial cognitive function impairment at early stage of AD, and may further suggest the potential use of MEMRI to predict cognitive impairments. Early intervention that targets aberrant neuronal activity may be crucial to prevent cognitive impairment.
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