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Nitric oxide as modulator of neuronal function.

H Prast1, A Philippu

  • 1Institute of Pharmacy, Department of Pharmacology and Toxicology, University of Innsbruck, Peter-Mayr-Str. 1, A-6020 Innsbruck, Austria. helmut.prast@uibk.ac.at

Progress in Neurobiology
|March 16, 2001
PubMed
Summary

Nitric oxide (NO) acts as a crucial messenger in the brain, influencing neuronal excitability, memory, and neurotransmitter release. This free radical plays a universal role in modulating brain function.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Neurochemistry

Background:

  • Nitric oxide (NO) is recognized as a signaling molecule in the central nervous system.
  • Its precise roles in neuronal function and neurotransmission are areas of ongoing investigation.

Purpose of the Study:

  • To elucidate the multifaceted roles of NO in regulating neuronal excitability, synaptic plasticity, and neurotransmitter release.
  • To explore the mechanisms underlying NO's modulatory effects on various neurotransmitter systems.

Main Methods:

  • Pharmacological manipulation using NO donors and NO synthase inhibitors.
  • In vivo and in vitro studies across different brain structures.
  • Analysis of neurotransmitter release modulation by NO.

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Main Results:

  • NO is implicated in regulating neuronal excitability, long-term potentiation/depression, and memory processes.
  • Endogenous NO modulates the release of diverse neurotransmitters including acetylcholine, catecholamines, amino acids, serotonin, histamine, and adenosine.
  • Cyclic guanosine monophosphate (cGMP) and glutamate mediate NO's effects on transmitter release, with both increases and decreases observed.

Conclusions:

  • NO plays a universal role in modulating neurotransmitter release in the brain.
  • Nitrergic neurons contribute significantly to the regulation of synaptic transmission.
  • NO's influence extends beyond receptor-mediated pathways, highlighting its broad impact on neuronal communication.