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Related Experiment Videos

Aspartate release from rat hippocampal synaptosomes.

S E Bradford1, J V Nadler

  • 1Department of Pharmacology and Cancer Biology, Box 3813, 100B Research Park 2, Research Drive, Duke University Medical Center, Durham, NC 27710, USA.

Neuroscience
|October 7, 2004
PubMed
Summary

Aspartate release from rat hippocampal synaptosomes differs significantly from glutamate release. Aspartate release is not dependent on typical exocytosis pathways, suggesting a distinct cytoplasmic or non-classical vesicular release mechanism.

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Area of Science:

  • Neuroscience
  • Neurochemistry
  • Molecular Biology

Background:

  • Excitatory amino acid pathways in the rat hippocampus release both glutamate and aspartate.
  • The precise mechanisms governing aspartate release, particularly in comparison to glutamate, remain incompletely understood.

Purpose of the Study:

  • To characterize the release mechanism of aspartate from rat hippocampal synaptosomes.
  • To compare aspartate release mechanisms with those of glutamate release within the same tissue samples.

Main Methods:

  • Simultaneous quantification of aspartate and glutamate release from rat hippocampal synaptosomes.
  • Stimulation using potassium (K+), 4-aminopyridine (4-AP), and ionomycin in a calcium-dependent manner.
  • Assessment of the involvement of voltage-dependent calcium channels, Na+/Ca2+ exchange, and vesicular transport mechanisms.

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Main Results:

  • Both aspartate and glutamate release were calcium-dependent, but aspartate release showed distinct characteristics.
  • Aspartate release was less dependent on P/Q-type voltage-dependent calcium channels and was influenced by reversed Na+/Ca2+ exchange, unlike glutamate.
  • Tetanus and botulinum neurotoxins, as well as bafilomycin A1, inhibited glutamate release but not aspartate release, indicating different exocytosis pathways.

Conclusions:

  • Aspartate release from hippocampal synaptosomes likely occurs via a non-classical exocytosis or a novel cytoplasmic Ca2+-dependent mechanism.
  • This distinct release mechanism suggests aspartate may be predominantly released outside presynaptic active zones.
  • Aspartate may act as a primary agonist for extrasynaptic N-methyl-D-aspartate receptors.