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Perforated synapses on double-headed dendritic spines: a possible structural substrate of synaptic plasticity
Y Geinisman1, F Morrell, L deToledo-Morrell
1Department of Cell Biology and Anatomy, Northwestern University Medical School, Chicago, IL 60611.
Brain Research
|February 20, 1989
Summary
Double-headed dendritic spines in rat brains form more perforated synapses after kindling. This structural change suggests enhanced synaptic efficacy, crucial for learning and memory.
Area of Science:
- Neuroscience
- Cellular Biology
- Synaptic Plasticity
Background:
- Axospinous synapses are critical for information processing in the brain.
- Dendritic spines undergo structural modifications related to synaptic function.
Purpose of the Study:
- To investigate the role of double-headed dendritic spines in synaptic plasticity.
- To quantify changes in perforated synapses on double-headed spines following kindling.
Main Methods:
- Serial section electron microscopy of rat dentate gyrus.
- Disector technique for estimating synapse-to-neuron ratios.
- Medial perforant path stimulation to induce kindling.
Main Results:
- Identified double-headed dendritic spines forming perforated synaptic contacts.
- Observed a significant increase in perforated synapses on double-headed spines in kindled rats.
- Perforated synapses exhibited discontinuous postsynaptic densities.
Conclusions:
- Double-headed dendritic spines are involved in forming perforated synapses.
- Kindling via medial perforant path stimulation enhances perforated synapse formation.
- These structural modifications are linked to increased synaptic efficacy.