Related Experiment Videos
Structure suggests function: the case for synaptic ribbons as exocytotic nanomachines
1Department of Otolaryngology-HNS, University of Virginia School of Medicine, VA, USA.
Summary
Synaptic ribbons, crucial for sensory synapses, are now understood to supply neurotransmitter vesicles to the active zone. Recent innovations reveal their structure and function, suggesting similarities with conventional synapses.
Area of Science:
- Neuroscience
- Cell Biology
- Sensory Systems
Background:
- Synaptic ribbons are organelles found in sensory synapses (vision, hearing, balance).
- Their role in presynaptic function and molecular makeup were previously unclear.
- They are associated with synaptic vesicles at the active zone.
Purpose of the Study:
- To elucidate the ultrastructure and function of synaptic ribbons.
- To understand the molecular composition of synaptic ribbons.
- To investigate the role of synaptic ribbons in presynaptic function.
Main Methods:
- Electrical capacitance measurements for sub-millisecond exocytosis resolution.
- Evanescent-wave microscopy for single synaptic vesicle fusion imaging.
- Electron tomography for 3D synapse architecture.
- Molecular cloning for identifying ribbon proteins.
Main Results:
- Recent technical innovations have provided new insights into ribbon synapses.
- Synaptic ribbons appear to function as a 'conveyor belt' for vesicle supply.
- The 3D architecture and molecular components of ribbons are being identified.
- Ribbon and conventional chemical synapses share common features.
Conclusions:
- Synaptic ribbons play a key role in regulating presynaptic function in sensory systems.
- Advanced imaging and molecular techniques are crucial for studying ribbon synapses.
- Further research may reveal more commonalities between ribbon and conventional synapses.