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Visual experience and deprivation bidirectionally modify the composition and function of NMDA receptors in visual
B D Philpot1, A K Sekhar, H Z Shouval
1Howard Hughes Medical Institute, Department of Neuroscience, Brown University, Box 1953, Providence, RI 02912, USA.
Neuron
|February 22, 2001
Summary
Visual experience and deprivation alter synaptic NMDA receptors (NMDARs) in rat visual cortex. This study reveals how NMDAR composition changes impact neural receptive fields during development.
Area of Science:
- Neuroscience
- Synaptic Plasticity
- Visual System Development
Background:
- Receptive field properties of visual cortical neurons change with experience and deprivation.
- The underlying synaptic mechanisms for these modifications remain largely unknown.
Purpose of the Study:
- To investigate the role of synaptic NMDA receptors (NMDARs) in experience-dependent plasticity of visual cortical neurons.
- To elucidate how NMDAR composition and function are regulated by visual experience and deprivation.
Main Methods:
- Electrophysiological recordings from visual cortex layer 2/3 pyramidal cells in young rats.
- Manipulation of visual experience and sensory deprivation.
- Analysis of NMDAR subunit composition and synaptic current properties.
Main Results:
- Visual experience decreased NR2B-containing NMDARs, shortened NMDAR current duration, and reduced current summation during high-frequency stimulation.
- Visual deprivation had the opposite effect on NMDAR composition and function.
- Experience-induced changes occurred within hours, while deprivation-induced changes took days, though both were reversible.
Conclusions:
- Synaptic NMDAR composition and function are bidirectionally regulated by visual experience and deprivation.
- These experience-dependent NMDAR changes are critical for the development of receptive field organization in the visual cortex.