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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.
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Related Experiment Video

Updated: Jul 15, 2025

Efficient Differentiation of Postganglionic Sympathetic Neurons using Human Pluripotent Stem Cells under Feeder-free and Chemically Defined Culture Conditions
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Shining light on the noradrenergic system.

Emmeraude Tanguay1, Sarah-Julie Bouchard1, Martin Lévesque1,2

  • 1CERVO Brain Research Centre, Quebec, Quebec, Canada.

Neurophotonics
|September 28, 2023
PubMed
Summary
This summary is machine-generated.

New optical and fluorescent tools allow researchers to effectively study the noradrenergic system and locus coeruleus (LC) activity in rodents during behavior.

Keywords:
arousalbehaviorcalcium imagingfiber photometrygenetically encoded noradrenaline sensorslearninglocus coeruleusmemorynoradrenalinenorepinephrinesleepstresstwo-photon microscopy

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Area of Science:

  • Neuroscience
  • Neurobiology
  • Systems Neuroscience

Background:

  • The noradrenergic system's role in brain function and behavior is not fully understood.
  • Investigating *in vivo* noradrenergic activity is difficult due to the locus coeruleus (LC) small size and location.
  • Traditional recording methods face challenges in studying the LC.

Purpose of the Study:

  • To review recent advances in optical and fluorescent methods for studying the noradrenergic system.
  • To examine the application of these methods in recording LC activity during rodent behavior.

Main Methods:

  • Genetically encoded calcium indicators for imaging noradrenergic neuron activity.
  • Fluorescent biosensors for monitoring noradrenaline release.
  • Application of these techniques in rodent models during behavioral tasks.

Main Results:

  • Optical and fluorescent methods offer new possibilities for studying the LC.
  • These techniques enable more effective *in vivo* recordings of noradrenergic activity.
  • The review details how these methods are currently used in behavioral neuroscience.

Conclusions:

  • Advanced optical and fluorescent techniques are crucial for understanding the noradrenergic system.
  • These methods provide indispensable tools for *in vivo* investigation of noradrenaline.
  • Further research using these tools will enhance our knowledge of LC function in behavior.