Related Experiment Videos
Presynaptic fluctuations and release-independent depression.
Kirill E Volynski1, Dmitri A Rusakov, Dimitri M Kullmann
1Institute of Neurology, University College London, Queen Square, London WC1N 3BG, UK. k.volynski@ion.ucl.ac.uk
Nature Neuroscience
|August 1, 2006
Summary
Stochastic fluctuations in the release machinery can cause apparent depression, even without vesicle depletion. Analyzing depression and interstimulus intervals reveals release apparatus state transition kinetics.
Area of Science:
- Neuroscience
- Cell Biology
- Biophysics
Background:
- Short-term synaptic depression is often attributed to vesicle depletion.
- However, transient depression of release probability has been observed even when action potentials fail to elicit release.
Purpose of the Study:
- To propose and investigate stochastic fluctuations in the release machinery as a mechanism for apparent release-independent depression.
- To explore how sampling bias can lead to this phenomenon.
Main Methods:
- Theoretical modeling of stochastic release processes.
- Analysis of the relationship between apparent depression and interstimulus intervals.
Main Results:
- Stochastic fluctuations can create sampling bias, mimicking release-independent depression.
- The interstimulus interval dependence of this apparent depression offers insights into the underlying kinetics.
Conclusions:
- Apparent release-independent depression can arise from inherent variability in the release machinery, not solely from vesicle depletion.
- This provides a novel perspective on synaptic plasticity and the dynamics of neurotransmitter release.