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Adenosine modulates synaptic plasticity in hippocampal slices from aged rats
A R Costenla1, A de Mendonça, J A Ribeiro
1Laboratory of Neurosciences, Faculty of Medicine of Lisbon, Portugal.
Brain Research
|January 22, 2000
Summary
Adenosine
Area of Science:
- Neuroscience
- Neurobiology
- Pharmacology
Background:
- Adenosine modulates synaptic plasticity in young animals via adenosine A1 receptors.
- Aging may alter adenosine's role in synaptic plasticity.
- Understanding these changes is crucial for cognitive health in aging.
Purpose of the Study:
- To investigate if adenosine's modulatory effects on synaptic plasticity persist in aged rat hippocampus.
- To compare the impact of adenosine A1 receptor antagonism on various plasticity phenomena in young and old rats.
Main Methods:
- Used hippocampal slices from young (5-6 weeks) and old (2 years) male Wistar rats.
- Administered 1,3-dipropyl-8-cyclopentylxanthine (DPCPX), an adenosine A1 receptor antagonist.
- Assessed paired-pulse facilitation (PPF), long-term depression (LTD), long-term potentiation (LTP), and depotentiation.
Main Results:
- DPCPX attenuated PPF in both age groups.
- LTD was only observed with DPCPX in both young and old rats.
- Depotentiation was enhanced by DPCPX in both age groups.
- LTP induced by theta-burst stimulation was impaired in young rats without DPCPX but not in old rats.
Conclusions:
- The modulatory role of endogenous adenosine on synaptic plasticity is largely maintained in aged animals.
- Targeting adenosine A1 receptors could offer therapeutic strategies for modifying synaptic plasticity in aging.
- These findings have implications for age-related cognitive function and potential interventions.