Related Experiment Videos
Dynamic imaging of purified individual synaptic vesicles
V Parpura1, R T Doyle, T A Basarsky
1Department of Zoology and Genetics, Iowa State University, Ames 50011-3223, USA.
Neuroimage
|March 1, 1995
Summary
Atomic force microscopy (AFM) directly images synaptic vesicles, revealing their structure and changes in solution. This technique allows visualization of vesicle dynamics, aiding synaptic transmission research.
Area of Science:
- Neuroscience
- Biophysics
- Cell Biology
Background:
- Synaptic vesicles are crucial for neurotransmitter release.
- Understanding their structure and dynamics is key to synaptic transmission.
- Direct visualization methods are needed to study vesicle behavior.
Purpose of the Study:
- To assess the capability of Atomic Force Microscopy (AFM) for imaging synaptic vesicles.
- To observe structural changes in synaptic vesicles under varying conditions.
- To explore AFM's potential for in vitro reconstitution studies of synaptic events.
Main Methods:
- Purified synaptic vesicles were imaged using Atomic Force Microscopy (AFM).
- Imaging was performed both in dry conditions and in solution.
- Vesicle structure was monitored over time and after hypo-osmotic stress (reduction from 330 to 110 mOsm).
Main Results:
- Individual synaptic vesicles (approx. 50 nm diameter) were clearly resolved by AFM.
- Vesicles were successfully imaged repeatedly for over 2 hours.
- Hypo-osmotic treatment induced significant expansion and flattening of the vesicles.
Conclusions:
- AFM can directly resolve individual synaptic vesicles and track their structural modifications.
- This capability enables the study of vesicle dynamics in real-time.
- AFM offers a promising tool for in vitro reconstitution and visualization of the secretory event to understand synaptic protein functions.