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Updated: May 13, 2026

Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology
14:57

Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology

Published on: March 23, 2011

Altered synaptic dynamics during normal brain aging.

Ricardo Mostany1, James E Anstey, Kerensa L Crump

  • 1Department of Neurology, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, California 90095, USA. rmostany@tulane.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 1, 2013
PubMed
Summary
This summary is machine-generated.

Aging alters brain synaptic dynamics, not synapse loss. New dendritic spines and boutons stabilize more in older mice but are retained longer, leading to weaker, less efficient neural circuits.

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Area of Science:

  • Neuroscience
  • Aging Research
  • Synaptic Plasticity

Background:

  • Previous studies on aging's neuroanatomical basis focused on spine density, with controversial results and unassessed spine dynamics.
  • The precise synaptic mechanisms underlying age-related cognitive decline remain unclear.

Purpose of the Study:

  • To investigate the hypothesis that aging is associated with alterations in synaptic dynamics in the mouse somatosensory cortex.
  • To assess changes in dendritic spine and axonal bouton dynamics over time in aging mice.

Main Methods:

  • Chronic in vivo two-photon imaging of dendritic spines and axonal boutons in thy1 GFP mice for up to 1 year.
  • Serial section electron microscopy reconstructions of previously imaged dendrites in aged mice.

Main Results:

  • Spine and en passant bouton (EPB) density increased throughout adulthood but stabilized in mature and old mice.
  • New spines and EPBs showed increased stabilization in old mice, but long-term retention was lower.
  • Spines in old mice were smaller but retained synaptic connections; synapse loss was not observed.

Conclusions:

  • Age-related sensory deficits are linked to altered spine and bouton size and stability, not synapse loss in the somatosensory cortex.
  • These synaptic alterations likely result in weaker synapses and reduced short-term plasticity, leading to less efficient neural circuits in aged individuals.