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Updated: Mar 24, 2026

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Assessment of Long-term Depression Induction in Adult Cerebellar Slices
Published on: October 16, 2019
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[PLASTIC REORGANIZATION OF THE ULTRASTRUCTURE OF SYNAPSES IN THE CEREBELLUM DUE TO TOXIC EFFECTS OF GLUTAMATE AND
Morfologiia (Saint Petersburg, Russia)
|March 19, 2016
Summary
High concentrations of glutamate and NO alter frog cerebellar synapses. Glutamate causes spines to envelop boutons, while NO causes boutons to surround spines, indicating functional changes.
Area of Science:
- Neuroscience
- Cell Biology
- Cerebellar Research
Context:
- Synaptic plasticity is crucial for cerebellar function.
- Glutamate and nitric oxide (NO) are key signaling molecules in the brain.
- Understanding their roles in synaptic morphology is essential.
Purpose:
- To investigate the ultrastructural changes in parallel fiber (PF) and Purkinje cell dendrite (PCD) synapses.
- To compare the effects of high glutamate (Glu) and NO-generating compounds on synaptic morphology.
- To elucidate the role of glial cells in modulating these synaptic changes.
Summary:
- Exposure to 1 mM glutamate caused Purkinje cell dendrite spines to envelop presynaptic boutons.
- Exposure to an NO-generating compound resulted in boutons surrounding the spines.
- Glial cell ensheathment patterns differed: glial cells surrounded spines with glutamate and boutons with NO.
- Electrical stimulation of parallel fibers significantly increased bouton-ensheathing glial structures in the presence of NO.
Impact:
- Reveals distinct morphological responses of cerebellar synapses to excitotoxicity and NO signaling.
- Highlights the differential involvement of glial cells in synaptic remodeling under stress.
- Provides insights into the functional consequences of altered synaptic structures in the cerebellum.
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