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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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Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
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Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
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Adrenergic Receptors: β Subtype01:26

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Updated: May 21, 2025

Inducing Plasticity of Astrocytic Receptors by Manipulation of Neuronal Firing Rates
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Norepinephrine changes behavioral state through astroglial purinergic signaling.

Alex B Chen1,2,3, Marc Duque2,3, Altyn Rymbek4

  • 1Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA, USA.

Science (New York, N.Y.)
|May 15, 2025
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Norepinephrine (NE) triggers astrocytes to release ATP, which becomes adenosine, suppressing behavior. This reveals a key role for astroglial purinergic signaling in NE-mediated brain state transitions.

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Area of Science:

  • Neuroscience
  • Cellular Signaling
  • Behavioral Biology

Background:

  • Neurons and glia communicate via neuromodulators, but their interactive roles in circuit computation and behavior remain largely unknown.
  • Norepinephrine (NE) is a neuromodulator that influences both behavior and neural activity, mediating fast excitation and delayed inhibition.

Purpose of the Study:

  • To investigate the mechanisms by which neuron-glial interactions, specifically involving neuromodulators, impact circuit computation and behavior.
  • To elucidate the role of astroglial purinergic signaling in mediating the inhibitory effects of norepinephrine (NE) during behavioral transitions.

Main Methods:

  • Utilized larval zebrafish as a model system to study behavioral transitions induced by futility.
  • Investigated the signaling pathway involving norepinephrine (NE), astroglia, purinergic signaling (ATP, adenosine), and neuronal adenosine receptors.

Main Results:

  • Demonstrated that astroglial purinergic signaling mediates the inhibitory component of NE-driven behavioral and circuit activity changes.
  • Showed that NE stimulates astroglial release of adenosine triphosphate (ATP), which is converted extracellularly to adenosine.
  • Confirmed that adenosine activates hindbrain neuronal adenosine receptors, leading to behavioral suppression.

Conclusions:

  • Astroglial purinergic signaling is a critical component of the norepinephrine (NE)-mediated inhibitory motif during behavioral and brain state transitions.
  • This study highlights an evolutionarily conserved role for astroglia as effectors in neuromodulatory signaling, influencing complex behaviors.
  • The findings position astrocytes as key players in NE-driven behavioral regulation and brain state modulation.