Abstract
Glial glutamine and glutamate transporters play an important role in glial/neuronal interactions. An excellent model to establish the role of these membrane proteins is the cerebellum. The most abundant glutamatergic synapse in the central nervous system is present in the molecular layer of the cerebellar cortex, and it is entirely wrapped by Bergmann glial cells. The recycling of glutamate involves glutamate and glutamine transporters enriched in these radial glial processes. The functional properties of amino acid glial transporters allow, in an activity-dependent manner, the conformation of protein complexes important for the adequate support of glutamatergic neurotransmission. A detailed description of the most important features of glial glutamate and glutamine transporters follows, and a working model of the molecular mechanisms by which these glutamate and glutamine binding proteins interact, and by these means might modulate cerebellar glutamatergic transactions, is presented.
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Abbreviations
- AMPA:
-
Alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate
- ASC:
-
Alanine/serine/cysteine transporter subfamily
- ATP:
-
Adenosine triphosphate
- BCH:
-
2-Aminobicyclo-(2,2,1)-heptane-2-carboxylic acid
- CATs:
-
Cationic amino acid transporters
- CNS:
-
Central nervous system
- E15:
-
Embryonic day 15
- E19:
-
Embryonic day 19
- EAAT:
-
Excitatory amino acid transporter
- EAAT1:
-
Excitatory amino acid transporter 1 (GLAST, SLC1a3)
- EAAT2:
-
Excitatory amino acid transporter 2 (GLT-1, SLC1a2)
- EAAT3:
-
Excitatory amino acid transporter 3
- EAAT4:
-
Excitatory amino acid transporter 4
- EAAT5:
-
Excitatory amino acid transporter 5
- GABA:
-
Gamma-aminobutyric acid
- Glut1:
-
Glucose transporter 1
- GRIs:
-
Ionotropic glutamate receptors
- GRIA2:
-
Glutamate ionotropic receptor AMPA type subunit 2
- GRMs:
-
Metabotropic glutamate receptors
- GSH:
-
Glutathione
- KA:
-
Kainate
- L-AP-4:
-
L-2-amino-phosphonobutanoate
- LATs:
-
Light subunits of amino acid transporters
- MeAIB:
-
2-Methylaminoisobutyric acid
- mRNA:
-
Messenger ribonucleic acid
- mTOR:
-
Mechanistic target of rapamycin
- NMDA:
-
N-Methyl-d-aspartate
- PI3K:
-
Phosphatidylinositol 3-kinase
- PKB:
-
Protein kinase B
- PNS:
-
Peripheral nervous system
- Quis:
-
Quisqualate
- Rho:
-
Ras homolog gene family
- ROS:
-
Reactive oxygen species
- SA:
-
System A
- SLC1:
-
Solute carrier family 1
- SLC14A:
-
Solute carrier family 1 member 4 (ASCT1)
- SLC15A:
-
Solute carrier family 1 member 5 (ASCT2)
- SLC38:
-
Solute carrier family 38
- SLC38A1:
-
Solute carrier family 38 member 1 (SNAT1)
- SLC38A2:
-
Solute carrier family 38 member 2 (SNAT2)
- SLC38A3:
-
Solute carrier family 38 member 3 (SNAT3)
- SLC38A4:
-
Solute carrier family 38 member 4 (SNAT4)
- SLC38A5:
-
Solute carrier family 38 member 5 (SNAT5)
- SLC38A7:
-
Solute carrier family 38 member 7 (SNAT7)
- SLC38A8:
-
Solute carrier family 38 member 8 (SNAT8)
- SLC6:
-
Solute carrier family 6
- SLC6A14:
-
Solute carrier family 6 member 14 (ATBo)
- SLC6A15:
-
Solute carrier family 6 member 15 (BoAT2)
- SLC6A19:
-
Solute carrier family 6 member 19 (BoAT1)
- SLC7:
-
Solute carrier family 7
- SLC7A5:
-
Solute carrier family 7 member 5 (LAT1)
- SLC7A8:
-
Solute carrier family 7 member 8 (LAT2)
- SN:
-
System N
- SNAT:
-
Sodium-coupled neutral amino acid transporter
- tACPD:
-
1-Amino-4,5-cyclopentane-trans-1,3-dicarboxylate
- Xc − :
-
Anionic amino acid transporter light chain, Xc-system, member 11 (SLC7a11)
- xCT:
-
Functional subunit of anionic amino acid transporter light chain, Xc-system, member 11
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Acknowledgments
The work in our laboratories is supported by grants from Conacyt-México (255087) to A.O., Soluciones para un México Verde to A.O., and FOFI-UAQ2015 (FNN201608) to A.R.
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Rodríguez, A., Ortega, A. (2017). Glutamine/Glutamate Transporters in Glial Cells: Much More Than Participants of a Metabolic Shuttle. In: Ortega, A., Schousboe, A. (eds) Glial Amino Acid Transporters. Advances in Neurobiology, vol 16. Springer, Cham. https://doi.org/10.1007/978-3-319-55769-4_8
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