Synapse stability in the precuneus early in the progression of alzheimer's disease

Stephen W. Scheff, Douglas A. Price, Frederick A. Schmitt, Kelly N. Roberts, Milos D. Ikonomovic, Elliott J. Mufson

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Amnestic mild cognitive impairment (aMCI) is considered to be one of the early stages in the progression from no cognitive impairment (NCI) to Alzheimer's disease (AD). Individuals with aMCI have increased levels of AD-type neuropathology in multiple regions of the neocortex and hippocampus and demonstrate a loss of synaptic connectivity. Recent neuroimaging studies have reported increased levels of 11C-PiB (Pittsburgh, compound B) in regions of the neocortex including the precuneus region of the medial parietal lobe. This cortical region has been implicated in episodic memory, which is disrupted early in the progression of AD. In this study, unbiased stereology coupled with electron microscopy was used to quantify total synaptic numbers in lamina 3 of the precuneus from short postmortem autopsy tissue harvested from subjects who died at different cognitive stages during the progression of AD. Individuals with aMCI did not reveal a statistically significant decline in total synapses compared to the NCI cohort while the AD group did show a modest but significant decline. Synaptic numbers failed to correlate with several different cognitive tasks including the Mini-Mental State Examination scores and episodic memory scores. Although levels of [3H]PiB binding were elevated in both the aMCI and AD groups, it did not strongly correlate with synaptic counts. These results support the idea that despite increased amyloid load, the precuneus region does not show early changes in synaptic decline during the progression of AD.

Original languageEnglish
Pages (from-to)599-609
Number of pages11
JournalJournal of Alzheimer's Disease
Volume35
Issue number3
DOIs
StatePublished - 2013

Keywords

  • Alzheimer's disease
  • early onset
  • episodic memory
  • synapses
  • synaptic plasticity

ASJC Scopus subject areas

  • General Neuroscience
  • Clinical Psychology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health

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