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Related Experiment Videos

Gases as neurotransmitters.

J E Haley1

  • 1Department of Pharmacology, University College London, U.K.

Essays in Biochemistry
|September 17, 1999
PubMed
Summary
This summary is machine-generated.

Nitric oxide (NO) plays a crucial role in hippocampal long-term potentiation (LTP) and spinal cord sensitization. Carbon monoxide (CO) has a less defined role in LTP, while NO is implicated in chronic pain pathways.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Physiology

Background:

  • Nitric oxide (NO) and carbon monoxide (CO) are gaseous signaling molecules synthesized in neurons.
  • Both molecules can readily diffuse across cell membranes.
  • Long-term potentiation (LTP) is a key cellular mechanism for learning and memory.

Purpose of the Study:

  • To investigate the roles of NO and CO in the induction and stabilization of LTP in the hippocampus.
  • To explore the involvement of NO in spinal cord sensitization and chronic pain.

Main Methods:

  • Utilized nitric oxide synthase (NOS) inhibitors and knockout mice to study NO production.
  • Examined the effects of CO production inhibitors on LTP.
  • Investigated the role of heme oxygenase-2 (HO-2) in CO production and LTP.

Related Experiment Videos

  • Assessed the impact of NOS inhibitors on spinal hyperalgesia models.

    • Main Results:

    • NOS inhibitors block hippocampal LTP induction; endothelial NOS is likely involved.
    • CO inhibitors affect LTP, but this effect doesn't correlate with CO production.
    • LTP is normal in HO-2 knockout mice, suggesting limited CO involvement.
    • NO diffuses postsynaptically to modulate neighboring neurons and presynaptic terminals, potentially via guanylate cyclase (GC) activation.
    • Both NO-dependent and NO-independent forms of LTP exist, allowing for synaptic input discrimination.
    • NOS inhibitors prevent spinal hyperalgesia, indicating NO's role in chronic pain.

    Conclusions:

    • NO is a significant modulator of hippocampal LTP and spinal cord sensitization.
    • NO's role in LTP involves diffusion and interaction with GC, contributing to synaptic plasticity.
    • NO contributes to chronic pain states by influencing spinal sensitization.
    • CO's role in LTP is less clear and may not be directly mediated by HO-2.