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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
Synapse specificity of long-term potentiation breaks down with aging
1Laboratory of Neurosciences, University of Mons-Hainaut, 7000 Mons, Belgium.
Learning & Memory (Cold Spring Harbor, N.Y.)
|March 14, 2007
Summary
Aging impairs memory by disrupting synaptic potentiation. This study found that in older mice, long-term potentiation (LTP) spreads beyond activated synapses, hindering memory encoding. Blocking calcium channels prevented this widespread LTP.
Area of Science:
- Neuroscience
- Aging Research
- Synaptic Plasticity
Background:
- Age-related memory decline is a significant concern.
- Memory encoding is theorized to depend on synaptic strength modifications, primarily through long-term potentiation (LTP).
- Aging is known to disrupt calcium signaling pathways crucial for synaptic function.
Purpose of the Study:
- To investigate the impact of aging on long-term potentiation (LTP) in mouse hippocampal slices.
- To determine if LTP in aged mice is restricted to stimulated synapses.
- To explore potential mechanisms for age-related alterations in LTP.
Main Methods:
- Tetanic stimulation of afferent fibers in hippocampal slices from 12-month-old mice.
- Electrophysiological recording to assess LTP.
- Pharmacological blockade of L-type Ca(++) channels and Ca(++)-induced Ca(++) release.
Main Results:
- Tetanic stimulation induced LTP that was not confined to the activated synapses in aged mice.
- This aberrant LTP spread was suppressed by blocking L-type Ca(++) channels.
- Inhibition of Ca(++)-induced Ca(++) release also prevented the widespread LTP phenomenon.
Conclusions:
- Aging disrupts the normal, localized nature of LTP, potentially impairing memory encoding.
- Aberrant LTP spread in aged mice is linked to dysregulated calcium signaling, specifically involving L-type Ca(++) channels and Ca(++)-induced Ca(++) release.
- Targeting these calcium pathways may offer therapeutic strategies for age-related memory deficits.
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