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- W2169791856 abstract "Abstract— Glutamate and aspartate probably serve as transmitters of hippocampal perforant path and commissural afferents, respectively. We therefore used slices of hippocampal regions to evaluate certain biochemical properties as markers for sites of transmission mediated by these amino acids. In these studies content and accumulation of glutamate and aspartate were compared with their Ca2+-dependent effluxes. Hippocampal regions varied little in their contents of glutamate and aspartate, but slices of regio superior and dentate gyrus accumulated and released more of each than slices of regio inferior. A commissurotomy or bilateral entorhinal lesion altered Ca2+-dependent efflux and accumulation in the same direction, but did not affect the glutamate or aspartate content of any hippocampal region. Elimination of hippocampal mossy fibers reduced the Ca2+-dependent efflux of glutamate and probably aspartate from slices of dentate gyrus, but not of regio inferior, where most mossy fiber synapses are located. The mossy fibers appeared relatively deficient in aspartate in both strains tested, but only in Purdue-Wistar rats were they enriched in glutamate. Removal of the perforant path input to the fascia dentata did not significantly change the activity of any of the enzymes most actively involved in glutamate synthesis. These results suggest that accumulation or high affinity transport of glutamate or aspartate can be employed to localize afferents which use these amino acids as transmitters, although it is not so reliable or selective a marker as Ca2+-dependent efflux. Enrichment in either glutamate or aspartate content or in the activity of enzymes which synthesize them is not a reliable marker. Neither amino acid is likely to be used as a transmitter by the hippocampal mossy fibers." @default.
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- W2169791856 date "1978-07-01" @default.
- W2169791856 modified "2023-10-09" @default.
- W2169791856 title "BIOCHEMICAL CORRELATES OF TRANSMISSION MEDIATED BY GLUTAMATE AND ASPARTATE" @default.
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- W2169791856 doi "https://doi.org/10.1111/j.1471-4159.1978.tb12442.x" @default.
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