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Updated: Nov 14, 2025
09:33
An Optical Assay for Synaptic Vesicle Recycling in Cultured Neurons Overexpressing Presynaptic Proteins
Published on: June 26, 2018
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Distinct functional developments of surviving and eliminated presynaptic terminals
Mitsuharu Midorikawa1, Mariko Miyata1
1Division of Neurophysiology, Department of Physiology, School of Medicine, Tokyo Women's Medical University, Tokyo 162-8666, Japan midorikawa.mitsuharu@twmu.ac.jp mmiyata@twmu.ac.jp.
Summary
Synapse refinement in the brain involves eliminating unnecessary connections. This study reveals how surviving synapses mature based on experience, while eliminated ones do not, clarifying neuronal circuit development.
Area of Science:
- Neuroscience
- Synaptic Plasticity
- Neuronal Development
Background:
- Neuronal circuit maturation requires selective synapse maintenance and elimination.
- The functional differentiation of synapses during refinement is not well understood.
- Experience-dependent mechanisms guide synapse selection.
Purpose of the Study:
- To investigate the functional differentiation of surviving and eliminated presynaptic terminals.
- To dissect experience-dependent and -independent maturation processes during circuit refinement.
Main Methods:
- Distinct labeling and direct recordings of presynaptic terminals in the somatosensory thalamus.
- Analysis of vesicle release, calcium channel function, and action potential waveforms.
Main Results:
- Surviving terminals showed experience-dependent enlargement of releasable vesicles and enhanced coupling of calcium channels and synaptic vesicles.
- Terminals fated for elimination did not mature in their transmitter release mechanisms, regardless of sensory experience.
- Both surviving and eliminated terminals exhibited experience-independent developmental shortening of action potential waveforms.
Conclusions:
- Experience shapes the maturation of surviving synapses by enhancing vesicle release machinery.
- Eliminated synapses fail to mature their release mechanisms, irrespective of experience.
- Neuronal circuit refinement involves distinct, experience-dependent and -independent maturation pathways for different synapse populations.
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