Short-term plasticity shapes activity pattern-dependent striato-pallidal synaptic transmission.
1Department of Anatomy and Neurobiology, College of Medicine, The University of Tennessee Health Science Center, Memphis, Tennessee 38163, USA.
Journal of Neurophysiology
|December 1, 2012
Summary
The cortico-striatal (Str)-globus pallidus external segment (GPe) pathway uses short-term synaptic enhancement to control neuronal firing. This mechanism sustains enhanced transmission, influencing GPe neuron activity based on Str neuron firing patterns.
Area of Science:
- Neuroscience
- Synaptic Plasticity
- Basal Ganglia Function
Background:
- The cortico-striatal (Str)-globus pallidus external segment (GPe) projection is crucial for basal ganglia function.
- Neuronal activity in this pathway varies significantly based on behavioral states.
Purpose of the Study:
- To investigate if short-term plasticity mechanisms dynamically control the gain of the Str-GPe projection.
- To understand how Str neuron firing patterns affect synaptic transmission in the Str-GPe pathway.
Main Methods:
- Utilized rat brain-slice preparations to study Str-GPe synapses.
- Applied repetitive burst activation mimicking Str neuron firing patterns.
Main Results:
- Str-GPe synapses exhibit strong short-term enhancement mechanisms.
- Repetitive burst activation sustains enhanced synaptic transmission for tens of seconds.
- Short-term enhancement contributes to pauses in GPe neuron firing.
Conclusions:
- Synaptic gain in the Str-GPe projection is dynamically regulated by short-term plasticity.
- The firing pattern of Str neurons critically determines signal transfer in the Str-GPe pathway.
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