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Related Experiment Video

Updated: May 26, 2026

Studying Synaptic Vesicle Pools using Photoconversion of Styryl Dyes
08:46

Studying Synaptic Vesicle Pools using Photoconversion of Styryl Dyes

Published on: February 15, 2010

FM dye photoconversion for visualizing synaptic vesicles by electron microscopy.

Peer Hoopmann, Silvio O Rizzoli, William J Betz

    Cold Spring Harbor Protocols
    |December 24, 2011
    PubMed
    Summary

    Styryl (FM) dyes enable selective labeling of synaptic vesicles for studying recycling. Photoconversion with diaminobenzidine (DAB) enhances electron microscopy resolution for fixed samples.

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    Related Experiment Videos

    Last Updated: May 26, 2026

    Studying Synaptic Vesicle Pools using Photoconversion of Styryl Dyes
    08:46

    Studying Synaptic Vesicle Pools using Photoconversion of Styryl Dyes

    Published on: February 15, 2010

    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

    FM Dye Cycling at the Synapse: Comparing High Potassium Depolarization, Electrical and Channelrhodopsin Stimulation
    08:31

    FM Dye Cycling at the Synapse: Comparing High Potassium Depolarization, Electrical and Channelrhodopsin Stimulation

    Published on: May 24, 2018

    Area of Science:

    • Neuroscience
    • Cell Biology
    • Biochemistry

    Background:

    • Synaptic vesicles are crucial organelles for neuronal communication.
    • Studying synaptic vesicle recycling is essential for understanding synaptic function.
    • Styryl (FM) dyes offer a method for selectively labeling recycling vesicles.

    Purpose of the Study:

    • To describe a method for enhancing the resolution of FM dye labeling studies.
    • To adapt FM dyes for use as endocytic markers in electron microscopy (EM).

    Main Methods:

    • Utilizing styryl (FM) dyes for reversible, membrane-selective staining of synaptic vesicles.
    • Employing photoconversion (photooxidation) of FM dyes under illumination.
    • Using diaminobenzidine (DAB) as a substrate for oxidized FM dye radicals.
    • Generating electron-dense precipitates for EM visualization.

    Main Results:

    • FM dyes selectively label membrane-bound recycling vesicles.
    • Photoconversion generates free radicals that oxidize nearby molecules.
    • Co-incubation with DAB results in electron-dense labeling of FM-stained organelles.
    • The technique significantly increases resolution in FM dye labeling studies for fixed preparations.

    Conclusions:

    • Photoconversion of FM dyes with DAB provides enhanced EM resolution for synaptic vesicle studies.
    • This method allows for precise visualization of synaptic vesicle recycling dynamics in fixed samples.