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Measuring Synaptic Vesicle Endocytosis in Cultured Hippocampal Neurons
Published on: September 4, 2017
A selective activity-dependent requirement for dynamin 1 in synaptic vesicle endocytosis
Shawn M Ferguson1, Gabor Brasnjo, Mitsuko Hayashi
1Howard Hughes Medical Institute, Kavli Institute for Neuroscience, Yale University School of Medicine, New Haven, CT 06510, USA.
Science (New York, N.Y.)
|April 28, 2007
Summary
Dynamin 1 (a protein) is essential for synaptic vesicle endocytosis during high neuronal activity. Mice lacking dynamin 1 show impaired endocytosis but can form functional synapses, indicating dynamin 1-independent pathways exist.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Dynamin 1 is a neuron-specific GTPase crucial for synaptic vesicle endocytosis.
- Its absence was expected to prevent synapse formation, but this study revealed unexpected findings.
Purpose of the Study:
- To investigate the role of dynamin 1 in synaptic vesicle endocytosis and synapse function.
- To explore dynamin 1-independent mechanisms of endocytosis in neurons.
Main Methods:
- Generation and analysis of dynamin 1-knockout mice.
- Microscopy to observe synaptic structures and membrane invaginations.
- Assessment of synaptic vesicle endocytosis during varying levels of neuronal stimulation.
Main Results:
- Dynamin 1-knockout mice formed functional synapses but had limited postnatal viability.
- Accumulation of branched, tubular plasma membrane invaginations capped by clathrin-coated pits was observed.
- Synaptic vesicle endocytosis was severely impaired during high stimulation but recovered upon cessation of stimulus.
Conclusions:
- Dynamin 1-independent pathways can support basal synaptic vesicle endocytosis.
- Dynamin 1 is indispensable for efficient synaptic vesicle endocytosis during intense neuronal activity.
- This highlights the complex regulation of synaptic vesicle recycling in neurons.
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