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Sökning: WFRF:(Tafreshiha A)

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  • Hägglund, Maria G A, et al. (författare)
  • Transport of L-glutamine, L-alanine, L-arginine and L-histidine by the neuron-specific Slc38a8 (SNAT8) in CNS
  • 2015
  • Ingår i: Journal of Molecular Biology. - : Elsevier BV. - 0022-2836 .- 1089-8638. ; 427:6, s. 1495-1512
  • Tidskriftsartikel (refereegranskat)abstract
    • Glutamine transporters are important for regulating levels of glutamate and GABA in the brain. To date, six members of the SLC38 family (SNATs) have been characterized and functionally subdivided into System A (SNAT1, SNAT2 and SNAT4) and System N (SNAT3, SNAT5 and SNAT7). Here we present a first functional characterization of SLC38A8, one of the previous orphan transporters from the family and we suggest that the encoded protein should be named SNAT8 to adhere with the SNAT nomenclature. We show that SLC38A8 have preference for transporting L-glutamine, L-alanine, L-arginine, L-histidine, and L-aspartate using a Na(+)-dependent transport mechanism and that the functional characteristics of SNAT8 has highest similarity to the known System A transporters. We also provide a comprehensive CNS expression profile in mouse brain for the Slc38a8 gene and the SNAT8 protein. We show that Slc38a8 (SNAT8) is expressed in all neurons, both excitatory and inhibitory, in mouse brain using in situ hybridization and immunohistochemistry. Furthermore, proximity ligation assay show highly similar subcellular expression of SNAT7 and SNAT8. In conclusion, the neuronal SLC38A8 have a broad amino acid transport profile and is the first identified neuronal System A transporter. This suggests a key role of SNAT8 in the glutamine/glutamate(GABA) cycle in the brain.
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