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Visual deprivation decreases somatic GAD65 puncta number on layer 2/3 pyramidal neurons in mouse visual cortex
Alicja Kreczko1, Anubhuthi Goel, Lihua Song
1Department of Biology, University of Maryland, College Park, 20742, USA.
Neural Plasticity
|June 9, 2009
Summary
Visual experience shapes inhibitory synapses in the brain. Dark-rearing reduces glutamic acid decarboxylase (GAD) 65-positive terminals in the visual cortex, with levels normalizing upon light exposure, indicating synaptic plasticity.
Area of Science:
- Neuroscience
- Visual System Development
- Synaptic Plasticity
Background:
- Visual system function relies on excitatory and inhibitory synapse maturation in the visual cortex.
- Perisomatic inhibition is crucial for regulating critical periods in visual cortex development.
- Understanding visual experience's role in regulating inhibition is essential.
Purpose of the Study:
- To investigate how visual experience regulates inhibitory synapse maturation in the visual cortex.
- To develop a method for analyzing inhibitory terminals in three dimensions.
Main Methods:
- Developed a novel immunohistochemical method for 3D analysis of glutamic acid decarboxylase (GAD) 65-positive inhibitory terminals.
- Utilized transgenic mice expressing yellow fluorescence protein (YFP) in specific neurons.
- Quantified GAD65-puncta on layer 2/3 pyramidal neurons in visually experienced and dark-reared mice.
Main Results:
- Dark-rearing significantly reduced the number of somatic GAD65-puncta on layer 2/3 pyramidal neurons.
- Re-exposure to light normalized the number of GAD65-puncta.
- No significant changes were observed in GAD65-puncta volume or intensity.
Conclusions:
- Visual experience dynamically regulates the number of inhibitory synapses in the visual cortex.
- Inhibitory circuitry in layer 2/3 of the visual cortex reorganizes in response to altered visual input.
- This study highlights the plasticity of the visual cortex during development.
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