Cited by 192Amino Acid Enzymes and MetabolismBarrier Structure and Function StudiesIon Transport and Channel Regulation

Glutamine transport by the blood-brain barrier: a possible mechanism for nitrogen removal

Lee, Wha-Joon, Hawkins, Richard A., Viña, Juan R., Peterson, Darryl R.·1998·American Journal of Physiology-Cell Physiology

Abstract

Glutamine and glutamate transport activities were measured in isolated luminal and abluminal plasma membrane vesicles derived from bovine brain endothelial cells. Facilitative systems for glutamine and glutamate were almost exclusively located in luminal-enriched membranes. The facilitative glutamine carrier was neither sensitive to 2-aminobicyclo(2,2,1)heptane-2-carboxylic acid inhibition nor did it participate in accelerated amino acid exchange; it therefore appeared to be distinct from the neutral amino acid transport system L1. Two Na-dependent glutamine transporters were found in abluminal-enriched membranes: systems A and N. System N accounted for ∼80% of Na-dependent glutamine transport at 100 μM. Abluminal-enriched membranes showed Na-dependent glutamate transport activity. The presence of 1) Na-dependent carriers capable of pumping glutamine and glutamate from brain into endothelial cells, 2) glutaminase within endothelial cells to hydrolyze glutamine to glutamate and ammonia, and 3) facilitative carriers for glutamine and glutamate at the luminal membrane may provide a mechanism for removing nitrogen and nitrogen-rich amino acids from brain.

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Crossref · 10.1152/ajpcell.1998.274.4.c1101

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  • Transporters of neutral and excitatory amino acids, glycine, taurine, and GABA are enriched abluminally and mediate high-affinity transport from brain to endothelium in a sodium-dependent fashion, after which these amino acids are transported across the luminal membrane into the blood via low-affinity transporters mediating clearance of nitrogen-rich and acidic amino acids into the circulation.

    “Transporters of neutral and excitatory AA, glycine, taurine, and GABA are enriched abluminally and with high-affinity transport from brain-to-endothelium in a sodium-dependent fashion, and then, these AA are transported across the luminal membrane of the BBB into the blood via low-affinity transporters mediating AA clearance of nitrogen-rich and acidic AA into the circulation (351, 453).”

    From Blood-Brain Barrier: From Physiology to Disease and Back (2019) · cites this paper as [351]

  • Glutamine is transported into endothelium via sodium-coupled neutral amino acid transporters 1, 2, 3, and 5 (SNAT1/2/3/5), then hydrolyzed in endothelium to glutamate via glutaminase, and removed into circulation.

    “Glutamine is transported into endothelium via sodium-coupled neutral AA transporter 1, 2, 3, and 5 (SNAT1/2/3/5) and then hydrolyzed in endothelium to glutamate via glutaminase, and removed into circulation (351).”

    From Blood-Brain Barrier: From Physiology to Disease and Back (2019) · cites this paper as [351]

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Authors
Lee, W.-J., Hawkins, R. A., Viña, J. R., & Peterson, D. R.
Affiliations
  • Department of Physiology and Biophysics, Finch University of Health Science/The Chicago Medical School, North Chicago, Illinois 60064-3095; and
  • Departamento de Bioquı́mica y Biologı́a Molecular, Facultades de Medicina y Farmacia, Universitat de Valencia, Valencia 46010, Spain
Venue
American Journal of Physiology-Cell Physiology
Published
1998-04-01
Volume
274
Issue
4
Pages
C1101-C1107
ISSN
  • 0363-6143 (ISSN-L)
  • 1522-1563
OpenAlex
W2243408637
Cited by
191
References
37
Citations by year
2026: 3 · 2025: 3 · 2024: 5 · 2023: 2 · 2022: 5 · 2021: 14 · 2020: 7 · 2019: 7 · 2018: 4 · 2017: 9 · 2016: 6 · 2015: 3 · 2014: 7 · 2013: 6 · 2012: 6
FWCI
5.21
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Cell Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01ns031017-03, 5r01ns016389-15)
  • National Institute of Neurological Disorders and Stroke (NS-31017, NS16389)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
Keywords
glutamine transport, blood-brain barrier, glutamate uptake, brain endothelial cells, nitrogen removal, glutaminase, sodium-dependent transport, plasma membrane vesicles, system N, system A, ammonia removal, amino acid substitutions
MeSH terms
Animals, Biological Transport, Blood-Brain Barrier, Brain, Cattle, Cell Membrane, Endothelium, Vascular, Glutaminase, Glutamine, Nitrogen, Sodium, Glutamic Acid

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