Abstract
Mammalian glutaminases catalyze the stoichiometric conversion of l-glutamine to l-glutamate and ammonium ions. In brain, glutaminase is considered the prevailing pathway for synthesis of the neurotransmitter pool of glutamate. Besides neurotransmission, the products of glutaminase reaction also fulfill crucial roles in energy and metabolic homeostasis in mammalian brain. In the last years, new functional roles for brain glutaminases are being uncovered by using functional genomic and proteomic approaches. Glutaminases may act as multifunctional proteins able to perform different tasks: the discovery of multiple transcript variants in neurons and glial cells, novel extramitochondrial localizations, and isoform-specific proteininteracting partners strongly support possible moonlighting functions for these proteins. In this chapter, we present a critical account of essential works on brain glutaminase 80 years after its discovery. We will highlight the impact of recent findings and thoughts in the context of the glutamate/glutamine brain homeostasis.
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Abbreviations
- AGC:
-
Aspartate–glutamate carrier
- BBB:
-
Blood-brain barrier
- EM:
-
Electron microscopy
- GA:
-
Phosphate-activated glutaminase
- GAB:
-
Gls2-encoded long GA isoform
- GAC:
-
Gls-encoded short GA isoform
- GAD:
-
Glutamic acid decarboxylase
- GDH:
-
Glutamate dehydrogenase
- GFAP:
-
Glial fibrillary acidic protein
- GIP:
-
Glutaminase-interacting protein
- GS:
-
Glutamine synthetase
- IMM:
-
Inner mitochondrial membrane
- KGA:
-
Gls-encoded long GA isoform
- LGA:
-
Gls2-encoded short GA isoform
- NBT:
-
Nitroblue tetrazolium
- NMR:
-
Nuclear magnetic resonance
- NPCs:
-
Neural progenitor cells
- PDZ:
-
PSD95/Dlg/ZO1 domains
- TCA:
-
Tricarboxylic acid cycle
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Acknowledgements
We are grateful to everybody in the Canceromics group for creating most of the own work described in this chapter, particularly to our colleagues F.J. Alonso, J.A. Segura, M. Martín-Rufián, C. Cardona, C. Lobo, A. Peñalver, and former members L. Olalla, P. Gómez-Fabre, C. Pérez-Gómez, and J.C. Aledo. The excellent collaboration of Dr. Antonia Gutiérrez and her team is also gratefully acknowledged. We are in debt with Dr. Alfonso Gutiérrez-Adán, Dr. Fernando Rodríguez de Fonseca, and Dr. Emilio Ambrosio for helpful discussions and collaborations with animal models. This work was supported by Excellence Grant CVI-6656 (Regional Andalusian government) and Grant RD12/0028/0013 of the RTA RETICS network from the Spanish Health Institute Carlos III. Thanks are due to Mrs. Kristina Pačesaitė for the design of the graphic work and to Mrs. Laura Castilla for excellent technical work.
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Márquez, J., Matés, J.M., Campos-Sandoval, J.A. (2016). Glutaminases. In: Schousboe, A., Sonnewald, U. (eds) The Glutamate/GABA-Glutamine Cycle. Advances in Neurobiology, vol 13. Springer, Cham. https://doi.org/10.1007/978-3-319-45096-4_6
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