Rahul Sharma (Editor)

N Acetylaspartic acid

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3DMet
  
B00227

Formula
  
C6H9NO5

Related compounds
  
BromisovalCarbromal

Molar mass
  
175.139 g/mol

N-Acetylaspartic acid httpsuploadwikimediaorgwikipediacommonsaa

Related alkanoic acids
  
3-Ureidopropionic acidbeta-Ureidoisobutyric acidCarbamoyl aspartic acidAceglutamideN-Acetylglutamic acidCitrulline

Appearance
  
Colourless, transparent crystals

N-Acetylaspartic acid, or N-acetylaspartate (NAA), is a derivative of aspartic acid with a formula of C6H9NO5 and a molecular weight of 175.139.

Contents

NAA is the second-most-concentrated molecule in the brain after the amino acid glutamate. It is detected in the adult brain in neurons, oligodendrocytes and myelin and is synthesized in the mitochondria from the amino acid aspartic acid and acetyl-coenzyme A.

Function

The various functions served by NAA are under investigation, but the primary proposed functions include:

  • Neuronal osmolyte that is involved in fluid balance in the brain
  • Source of acetate for lipid and myelin synthesis in oligodendrocytes, the glial cells that myelinate neuronal axons
  • Precursor for the synthesis of the neuronal dipeptide N-Acetylaspartylglutamate
  • Contributor to energy production from the amino acid glutamate in neuronal mitochondria

    • In the brain, NAA is thought to be present predominantly in neuronal cell bodies, where it acts as a neuronal marker.

    Applications

    However, the recent discovery of a higher concentration of NAA in myelin and oligodendrocytes than in neurons raises questions about the validity of the use of NAA as a neuronal marker. NAA gives off the largest signal in magnetic resonance spectroscopy of the human brain. The levels measured there are decreased in numerous neuropathological conditions ranging from brain injury to stroke to Alzheimer's disease. This fact makes NAA a potential diagnostic molecule for doctors treating patients with brain damage or disease.

    NAA may be a marker of creativity. High NAA levels in the hippocampus are related to better working memory performance in humans.

    NAA may function as a neurotransmitter in the brain by acting on metabotropic glutamate receptors.

    Further information

  • Moffett, John; Tieman, Suzannah B.; Weinberger, Daniel R.; Coyle, Joseph T.; Namboodiri, Aryan M. A., eds. (21 October 2006). N-Acetylaspartate: A Unique Neuronal Molecule in the Central Nervous System. Springer Science & Business Media. ISBN 978-0-387-30172-3. 
  • Biochemical Support for the "Threshold" Theory of Creativity: A Magnetic Resonance Spectroscopy Study, Rex E. Jung et al., April 22, 2009, 29(16):5319-5325; doi:10.1523/JNEUROSCI.0588-09.2009

    • References

    N-Acetylaspartic acid Wikipedia
    (Text) CC BY-SA


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