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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
Age-related decline of functional inhibition in rat cortex
S Schmidt1, C Redecker, C Bruehl
1Department of Neurology, Friedrich Schiller University, Erlanger Allee 101, 07747 Jena, Germany. silvio.schmidt@med.uni-jena.de
Neurobiology of Aging
|May 20, 2008
Summary
Aging impairs cortical inhibition in rats, linked to changes in GABA(A) receptors, particularly subunit alpha5. This age-dependent decline in neural function may affect cognitive and motor abilities.
Area of Science:
- Neuroscience
- Aging Research
- Neurophysiology
Background:
- Functional brain imaging reveals distinct activation patterns in aged versus young individuals.
- Age-related changes in neuronal excitability are hypothesized to underlie these observed brain activity differences.
Purpose of the Study:
- To investigate age-dependent changes in functional cortical inhibition.
- To examine the role of gamma-aminobutyric acid A (GABA(A)) receptor subunit composition in age-related alterations of neural function.
Main Methods:
- Paired pulse stimulation was used to assess cortical inhibition in rat brain slices from young, aged, and old male rats.
- Immunohistochemistry was employed to analyze the regional distribution of key GABA(A) receptor subunits (alpha1, alpha2, alpha3, alpha5, gamma2).
Main Results:
- Aged rats exhibited reduced functional cortical inhibition compared to younger animals.
- An altered composition of GABA(A) receptors was observed in aged rats, notably a reduction in the alpha5 subunit.
Conclusions:
- Age-dependent alterations in functional cortical inhibition, associated with changes in GABA(A) receptor subunits, are suggested to modulate brain activation patterns.
- These neurophysiological changes may partially explain age-related declines in cognitive and motor functions.
