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Related Experiment Videos

Atypical neural messengers.

D E Barañano1, C D Ferris, S H Snyder

  • 1Johns Hopkins University School of Medicine, Dept of Neuroscience, 725 N. Wolfe Street, Baltimore, MD 21205, USA.

Trends in Neurosciences
|February 13, 2001
PubMed
Summary
This summary is machine-generated.

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New synaptic molecules challenge traditional neurotransmitter definitions. Emerging evidence shows gases like nitric oxide and molecules like D-serine function as neurotransmitters through novel mechanisms.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Classical neurotransmitter definitions are based on storage in vesicles and release via exocytosis.
  • Recent discoveries reveal novel synaptic molecules that meet neurotransmitter criteria through unconventional pathways.

Purpose of the Study:

  • To explore how recent discoveries of synaptic molecules expand the definition of neurotransmitters.
  • To examine the unique properties and functions of newly identified neurotransmitter candidates.

Main Methods:

  • Review of recent literature on synaptic signaling molecules.
  • Analysis of biochemical and cellular mechanisms of novel neurotransmitter candidates.
  • Comparison of classical and non-classical neurotransmitter properties.

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Main Results:

  • Nitric oxide (NO) and carbon monoxide (CO) are synthesized and released on demand, not stored in vesicles.
  • These gaseous transmitters do not act on traditional postsynaptic receptors.
  • Zinc acts as a co-transmitter at NMDA receptors, modulating their activity.
  • D-serine, found in glia, acts as an endogenous ligand for the glycine site of NMDA receptors.

Conclusions:

  • The definition of a neurotransmitter must evolve to include molecules with non-classical release and action mechanisms.
  • Synaptic signaling is more diverse than previously understood, involving gases and glial-derived molecules.
  • Novel neurotransmitters like NO, CO, zinc, and D-serine offer new targets for understanding and treating neurological disorders.