Cited by 102Aldose Reductase and TaurineAmino Acid Enzymes and MetabolismDrug Transport and Resistance Mechanisms

Deletion of the γ-Aminobutyric Acid Transporter 2 (GAT2 and SLC6A13) Gene in Mice Leads to Changes in Liver and Brain Taurine Contents

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Zhou, Yun, Holmseth, Silvia, Guo, Caiying, Hassel, Bjørnar, Höfner, Georg, Huitfeldt, Henrik S., Wanner, Klaus T., Danbolt, Niels C.·2012·Journal of Biological Chemistry

Abstract

The GABA transporters (GAT1, GAT2, GAT3, and BGT1) have mostly been discussed in relation to their potential roles in controlling the action of transmitter GABA in the nervous system. We have generated the first mice lacking the GAT2 (slc6a13) gene. Deletion of GAT2 (both mRNA and protein) neither affected growth, fertility, nor life span under nonchallenging rearing conditions. Immunocytochemistry showed that the GAT2 protein was predominantly expressed in the plasma membranes of periportal hepatocytes and in the basolateral membranes of proximal tubules in the renal cortex. This was validated by processing tissue from wild-type and knockout mice in parallel. Deletion of GAT2 reduced liver taurine levels by 50%, without affecting the expression of the taurine transporter TAUT. These results suggest an important role for GAT2 in taurine uptake from portal blood into liver. In support of this notion, GAT2-transfected HEK293 cells transported [(3)H]taurine. Furthermore, most of the uptake of [(3)H]GABA by cultured rat hepatocytes was due to GAT2, and this uptake was inhibited by taurine. GAT2 was not detected in brain parenchyma proper, excluding a role in GABA inactivation. It was, however, expressed in the leptomeninges and in a subpopulation of brain blood vessels. Deletion of GAT2 increased brain taurine levels by 20%, suggesting a taurine-exporting role for GAT2 in the brain.

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  • Cxcl16 is highly expressed in dural-resident myeloid cells.

    “Using publicly available scRNA-Seq data8, we found that Cxcl16 (the ligand for CXCR6) was highly expressed in dural-resident myeloid cells (Extended Data Fig. 2e), indicating a potential receptor-ligand axis for its dural recruitment, retention and/or activation.”
  • The double-negative T-cell fraction in the meninges has a high representation of γδ-TCR-expressing cells.

    “Flow cytometric analysis revealed a high representation of γδ-T cell receptor (TCR)-expressing cells in the double-negative (DN) T-cell fraction (Extended Data Fig. 1a), a recently reported population in the meninges7,8.”

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Authors
Zhou, Y., Holmseth, S., Guo, C., Hassel, B., Höfner, G., Huitfeldt, H. S., Wanner, K. T., & Danbolt, N. C.
Affiliations
  • University of Oslo (NO)
  • Howard Hughes Medical Institute (US)
  • Oslo University Hospital (NO)
  • Ludwig-Maximilians-Universität München (DE)
Corresponding author
Danbolt, Niels C.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2012-10
Volume
287
Issue
42
Pages
35733-35746
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1566384403
Cited by
102
References
91
Citations by year
2026: 2 · 2025: 7 · 2024: 7 · 2023: 5 · 2022: 6 · 2021: 10 · 2020: 9 · 2019: 9 · 2018: 7 · 2017: 5 · 2016: 7 · 2015: 10 · 2014: 12 · 2013: 4 · 2012: 2
FWCI
4.69
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Aldose Reductase and Taurine
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
Keywords
GABA transporters, knockout mice, taurine transport, hepatocytes, proximal tubule, GABA uptake, leptomeninges
MeSH terms
Animals, Brain, Brain Chemistry, Humans, Kidney Cortex, Kidney Tubules, Proximal, Liver, Male, Rabbits, Taurine, Rats, Wistar, Mice, Knockout, Hepatocytes, GABA Plasma Membrane Transport Proteins, Mice, Rats, HEK293 Cells

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