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Glutamine Flux Imaging Using Genetically Encoded Sensors
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Published on: July 31, 2014

Glutamine in the central nervous system: function and dysfunction.

Jan Albrecht1, Ursula Sonnewald, Helle S Waagepetersen

  • 1Department of Neurotoxicology, M. Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland. jalb@cmdik.pan.pl

Frontiers in Bioscience : a Journal and Virtual Library
|November 28, 2006
PubMed
Summary

Glutamine (Gln) is crucial for brain function, synthesized in astrocytes and used by neurons. Dysregulation of Gln transport and metabolism can lead to neurological issues like cerebral edema.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Cell Biology

Background:

  • Glutamine (Gln) is the most abundant amino acid in the central nervous system (CNS).
  • Brain Gln levels exceed other amino acids significantly in interstitial and cerebrospinal fluid (CSF).
  • Intracerebral Gln synthesis by glutamine synthetase (GS) in astrocytes meets brain demand, as blood-to-brain transport is insufficient.

Purpose of the Study:

  • To elucidate the critical roles of glutamine in normal and abnormal brain function.
  • To investigate the mechanisms of Gln transport and metabolism within the CNS.
  • To understand the implications of Gln dysregulation in neurological conditions.

Main Methods:

  • Analysis of Gln concentrations in CNS fluids.
  • Investigation of Gln synthesis and degradation pathways involving glutamine synthetase (GS) and glutaminase (PAG).
  • Characterization of amino acid carriers mediating Gln transport between astrocytes, neurons, and the vascular system.

Main Results:

  • Astrocyte-derived Gln is essential for neuronal function, serving as a precursor for neurotransmitters like glutamate (Glu) and GABA.
  • The "glutamate-glutamine" cycle involves astrocyte uptake of Glu and its conversion back to Gln.
  • Specific amino acid carriers facilitate Gln flux, favoring astrocyte-to-neuron transport and brain efflux.
  • Excessive Gln accumulation, as seen in hyperammonemia, causes cerebral edema via mitochondrial dysfunction and osmotic effects.

Conclusions:

  • Glutamine plays a vital role in neurotransmission, energy metabolism, and maintaining brain homeostasis.
  • Dysfunctional Gln transport and metabolism contribute to neuropathology, including cerebral edema.
  • Emerging evidence highlights Gln's direct involvement in gene regulation, necessitating further research into its multifaceted roles.