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Transfer of glutamine between astrocytes and neurons
Abstract
The export of glutamine from astrocytes, and the uptake of glutamine by neurons, are integral steps in the glutamate‐glutamine cycle, a major pathway for the replenishment of neuronal glutamate. We review here the functional and molecular identification of the transporters that mediate this transfer. The emerging picture of glutamine transfer in adult brain is of a dominant pathway mediated by system N transport (SN1) in astrocytes and system A transport (SAT/ATA) in neurons. The participating glutamine transporters are functionally and structurally related, sharing the following properties: (a) unlike many neutral amino acid transporters which have proven to be obligate exchangers, these glutamine transporters mediate net substrate transfer energized by coupling to ionic gradients; (b) they are sensitive to small pH changes in the physiological range; (c) they are susceptible to adaptive and humoral regulation; (d) they are related structurally to the AAAP (amino acid and auxin permeases) family of transporters. A key difference between SN1 and the SAT/ATA transporters is the ready reversibility of glutamine fluxes via SN1 under physiological conditions, which allows SN1 both to sustain a glutamine concentration gradient in astrocytes and to mediate the net outward flux of glutamine. It is likely that the ASCT2 transporter, an obligate exchanger of neutral amino acids, displaces the SN1 transporter as the main carrier of glutamine export in proliferating astrocytes.
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Metadata
- Authors
- Bröer, S., & Brookes, N.
- Venue
- Journal of Neurochemistry
- Publisher
- Wiley
- Published
- 2001-05
- Volume
- 77
- Issue
- 3
- Pages
- 705-719
- ISSN
- 0022-3042 (ISSN-L)
- 1471-4159
- OpenAlex
- W1484355820
- Cited by
- 325
- References
- 1
- FWCI
- 8.69
- Type
- journal article
- Language
- en
- Open access
- closed
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