Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs

作者：Hui Zhang1,2, Niko G. Gubernator3,4, Minerva Yue1, Roland G. W. Staal1, Eugene V. Mosharov1, Daniela Pereira1, Vojtech Balsanek3, Paul A. Vadola3, Bipasha Mukherjee5, Robert H. Edwards5, David Sulzer1,2,6, Dalibor Sames3 1Departments of Neurology,Columbia University, 2Departments of Psychiatry and Pharmacology,Columbia University, 3Department of Chemistry,Columbia University, 4eMolecules, Inc., 5Departments of Neurology and Physiology,University of California School of Medicine, San Francisco, 6Division of Molecular Therapeutics,New York Psychiatric Institute

简介：A new means to measure neurotransmission optically using fluorescent dopamine analogs.

全文：

Overview

This study introduces a novel method for optically measuring neurotransmission using fluorescent dopamine analogs, specifically FFN 511. The technique allows for direct visualization of dopamine release from presynaptic terminals in brain slices.

Key Study Components

Area of Science

• Neuroscience
• Neurotransmission
• Fluorescent imaging

Background

• Fluorescent false neurotransmitters can mimic natural neurotransmitters.
• FFN 511 is a fluorescent monoamine that can be taken up by dopaminergic synaptic vesicles.
• This method provides insights into the dynamics of neurotransmitter release.
• Understanding dopamine release is crucial for studying various neurological conditions.

Purpose of Study

• To develop a procedure for labeling dopamine terminals in brain slices.
• To visualize and quantify dopamine release using FFN 511.
• To investigate the frequency-dependent release of dopamine.

Methods Used

• Preparation of acute brain slices from mice.
• Loading slices with FFN 511 and incubating in oxygenated artificial cerebrospinal fluid.
• Imaging using a multiphoton laser scanning microscope.
• Conducting stimulation experiments to observe dopamine release dynamics.

Main Results

• FFN 511 effectively labels dopamine terminals in the striatum.
• Release of FFN 511 is observable as a reduction in fluorescent signals.
• Detaining experiments reveal a frequency-dependent release of dopamine.
• High potassium chloride and amphetamine can displace FFN 511 from terminals.

Conclusions

• The method provides a reliable means to study dopamine release in real-time.
• FFN 511 serves as a valuable tool for investigating neurotransmission.
• This approach can enhance our understanding of dopaminergic signaling in the brain.

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