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Related Experiment Videos

Synapsin dispersion and reclustering during synaptic activity.

P Chi1, P Greengard, T A Ryan

  • 1Department of Biochemistry, Weill Medical College of Cornell University, 1300 York Avenue, New York, New York 10021, USA.

Nature Neuroscience
|October 31, 2001
PubMed
Summary

Synapsins dynamically regulate neurotransmitter release by dispersing from synaptic vesicles during firing and returning after. Phosphorylation controls this movement, impacting vesicle turnover and synaptic function.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Synaptic transmission relies on presynaptic modulation.
  • Synapsins are key proteins linked to synaptic vesicles and neurotransmitter release regulation.
  • Direct physiological evidence for synapsin's molecular mechanism was limited.

Purpose of the Study:

  • To investigate the dynamic role of synapsins in regulating synaptic vesicle mobilization.
  • To elucidate the molecular mechanisms underlying synapsin-mediated control of neurotransmitter release.
  • To establish the link between synapsin phosphorylation state and vesicle pool turnover kinetics.

Main Methods:

  • Utilized green fluorescent protein (GFP)-labeled synapsin Ia in living hippocampal terminals.
  • Observed synapsin Ia dissociation from vesicles and dispersion into axons during action potential firing.

Related Experiment Videos

  • Employed FM 4-64 imaging to measure vesicle pool mobilization alongside synapsin dispersion kinetics using mutated synapsin Ia forms.

    • Main Results:

    • Demonstrated that synapsin Ia dynamically dissociates from synaptic vesicles and disperses into axons during neuronal firing.
    • Showed that synapsin Ia reclusters to synapses upon cessation of activity.
    • Established that phosphorylation controls the rate of synapsin dispersion, which in turn governs vesicle pool turnover.

    Conclusions:

    • Synapsin acts as a crucial phosphorylation-state-dependent regulator of synaptic vesicle mobilization.
    • Synapsin's dynamic localization and phosphorylation control the kinetics of neurotransmitter release.
    • This study provides direct physiological evidence for synapsin's role in synaptic plasticity and function.