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Hippocampal activation is associated with longitudinal amyloid accumulation and cognitive decline

Journal Article · · eLife
DOI:https://doi.org/10.7554/eLife.22978· OSTI ID:1379725
 [1];  [2];  [1];  [2]
  1. Univ. of California, Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The amyloid hypothesis suggests that beta-amyloid (Aβ) deposition leads to alterations in neural function and ultimately to cognitive decline in Alzheimer’s disease. However, factors that underlie Aβ deposition are incompletely understood. One proposed model suggests that synaptic activity leads to increased Aβ deposition. More specifically, hyperactivity in the hippocampus may be detrimental and could be one factor that drives Aβ deposition. To test this model, we examined the relationship between hippocampal activity during a memory task using fMRI and subsequent longitudinal change in Aβ using PIB-PET imaging in cognitively normal older adults. We found that greater hippocampal activation at baseline was associated with increased Aβ accumulation. Furthermore, increasing Aβ accumulation mediated the influence of hippocampal activation on declining memory performance, demonstrating a crucial role of Aβ in linking hippocampal activation and memory. These findings support a model linking increased hippocampal activation to subsequent Aβ deposition and cognitive decline.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Institutes of Health; USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1379725
Journal Information:
eLife, Journal Name: eLife Vol. 6; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Cognition and dementia in older patients with epilepsy journal February 2018
Brain properties predict proximity to symptom onset in sporadic Alzheimer’s disease journal April 2018
Increased hippocampal excitability and altered learning dynamics mediate cognitive mapping deficits in human aging posted_content May 2019
Apolipoprotein E4, inhibitory network dysfunction, and Alzheimer’s disease journal June 2019
Neuroimaging Biomarkers for Alzheimer’s Disease journal June 2019
Emerging links between cell competition and Alzheimer's disease journal July 2019
Increased Hippocampal Excitability and Altered Learning Dynamics Mediate Cognitive Mapping Deficits in Human Aging journal March 2021
Oscillatory hyperactivity and hyperconnectivity in young APOE-ɛ4 carriers and hypoconnectivity in Alzheimer’s disease text January 2019
Tau Depletion in APP Transgenic Mice Attenuates Task-Related Hyperactivation of the Hippocampus and Differentially Influences Locomotor Activity and Spatial Memory journal March 2018
Effects of Astaxanthin from Shrimp Shell on Oxidative Stress and Behavior in Animal Model of Alzheimer’s Disease journal November 2019
Oscillatory hyperactivity and hyperconnectivity in young APOE-ɛ4 carriers and hypoconnectivity in Alzheimer’s disease journal April 2019

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