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Adrenergic Neurons: Neurotransmission01:27

Adrenergic Neurons: Neurotransmission

Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
Synthesis: Catecholamine synthesis requires tyrosine, which is taken...

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Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs
09:37

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Published on: August 31, 2009

Dopamine release at individual presynaptic terminals visualized with FFNs.

Hui Zhang1, Niko G Gubernator, Minerva Yue

  • 1Departments of Neurology, Columbia University.

Journal of Visualized Experiments : Jove
|September 2, 2009
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Summary

Researchers imaged dopamine release using novel fluorescent probes. They discovered that neurotransmitter release from synaptic vesicles depends on stimulus frequency and D2 dopamine receptors, revealing frequency-dependent presynaptic coding.

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Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs
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Vibrodissociation of Neurons from Rodent Brain Slices to Study Synaptic Transmission and Image Presynaptic Terminals
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Presynaptic Dopamine Dynamics in Striatal Brain Slices with Fast-scan Cyclic Voltammetry
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Presynaptic Dopamine Dynamics in Striatal Brain Slices with Fast-scan Cyclic Voltammetry

Published on: January 12, 2012

Area of Science:

  • Neuroscience
  • Cell Biology
  • Neurochemistry

Background:

  • Synaptic transmission relies on neurotransmitter release from vesicles.
  • Understanding neurotransmitter dynamics is crucial for neuroscience.
  • Direct observation of neurotransmitter uptake and release is challenging.

Purpose of the Study:

  • To develop fluorescent probes for direct imaging of neurotransmitter release.
  • To investigate dopamine release dynamics in the striatum.
  • To explore the relationship between stimulus frequency and synaptic vesicle release.

Main Methods:

  • Designed fluorescent false neurotransmitters (FFNs) as substrates for synaptic vesicle monoamine transporters.
  • Utilized FFNs to image dopamine release in individual presynaptic terminals in the striatum.
  • Analyzed stimulus frequency-dependent changes in neurotransmitter release and presynaptic terminal properties.

Main Results:

  • The fraction of synaptic vesicles releasing neurotransmitter per stimulus was frequency-dependent.
  • No kinetically distinct 'reserve' synaptic vesicle population was observed.
  • Revealed frequency-dependent heterogeneity among presynaptic terminals, partly mediated by D2 dopamine receptors.

Conclusions:

  • Developed a novel method for directly visualizing neurotransmitter release dynamics.
  • Demonstrated that stimulus frequency influences synaptic vesicle recruitment and release.
  • Identified D2 dopamine receptor-dependent presynaptic heterogeneity as a mechanism for frequency-based neural coding.