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Related Experiment Video

Updated: Jul 2, 2026

Measuring Exocytosis in Neurons Using FM Labeling
06:56

Measuring Exocytosis in Neurons Using FM Labeling

Published on: November 30, 2006

Measuring exocytosis in neurons using FM labeling.

Jamila Newton1, Venkatesh Murthy

  • 1Dept of Molecular and Cellular Biology, Harvard University, USA. howcontrived@gmail.com

Journal of Visualized Experiments : Jove
|August 16, 2008
PubMed
Summary

This study introduces FM dye imaging to measure neurotransmission vesicle release rates. This real-time method tracks presynaptic vesicle release kinetics, aiding neuroscience research.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biophysics

Background:

  • Neurotransmission relies on the precise release of vesicles.
  • Measuring vesicle release kinetics is crucial for understanding neuronal function.
  • Existing methods may lack the real-time resolution needed for detailed kinetic analysis.

Purpose of the Study:

  • To develop and validate a real-time imaging method for measuring presynaptic vesicle release rates.
  • To utilize FM4-64 dye for monitoring vesicle dynamics during neurotransmission.
  • To provide a tool for comparing exocytosis rates in different synaptic conditions.

Main Methods:

  • Real-time imaging of synaptic vesicles labeled with FM4-64 dye.
  • Stimulation of endocytosis to load FM dye into vesicles.
  • Washing to remove extracellular dye.
  • Induction of exocytosis via electrical stimulation.
  • Measurement of fluorescence decrease to quantify vesicle release rate.

Main Results:

  • FM4-64 fluorescence increases upon embedding in vesicle membranes during endocytosis.
  • A decrease in fluorescence after electrical stimulation indicates vesicle release (exocytosis).
  • The rate of fluorescence decrease directly correlates with the rate of vesicle release.
  • The method allows for transient, external application of the dye for live imaging.

Conclusions:

  • FM dye real-time imaging is an effective tool for measuring presynaptic vesicle release kinetics.
  • This technique facilitates the study of neurotransmission dynamics in neuronal cultures.
  • It is particularly useful for comparative analyses of exocytosis rates between transfected and control synapses.

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Quantitative Analysis of Synaptic Vesicle Pool Replenishment in Cultured Cerebellar Granule Neurons using FM Dyes
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Related Experiment Videos

Last Updated: Jul 2, 2026

Measuring Exocytosis in Neurons Using FM Labeling
06:56

Measuring Exocytosis in Neurons Using FM Labeling

Published on: November 30, 2006

Examination of Synaptic Vesicle Recycling Using FM Dyes During Evoked, Spontaneous, and Miniature Synaptic Activities
08:10

Examination of Synaptic Vesicle Recycling Using FM Dyes During Evoked, Spontaneous, and Miniature Synaptic Activities

Published on: March 31, 2014

Quantitative Analysis of Synaptic Vesicle Pool Replenishment in Cultured Cerebellar Granule Neurons using FM Dyes
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Quantitative Analysis of Synaptic Vesicle Pool Replenishment in Cultured Cerebellar Granule Neurons using FM Dyes

Published on: November 11, 2011