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- W2094796959 abstract "Abstract— Tetrodotoxin, Ca2+-deprivation and high-Mg2+ were used in an effort to identify the portion of the evoked release of endogenous amino acids, labelled via metabolism of [14C]-glucose, and several exogenous labelled amino acids, that came from nerve terminals when slices of guinea pig cerebral cortex were superfused with glucose-free solutions and stimulated electrically. With some exceptions, spontaneous release of labelled amino acids was decreased by 2 μm-tetrodotoxin but increased in Ca2+-free medium and in solutions containing an extra 24 mm-MgCl2. Tetrodotoxin suppressed 85–90% of the stimulated release of almost all labelled amino acids, but had a smaller effect on the release of endogenous 14C-labelled threonine-serine-glutamine (unseparated). In Ca2+-free solution, the stimulated release of endogenous 14C-labelled glutamate, aspartate and GABA was suppressed by 80–90%, but that of endogenous 14C-labelled threonine-serine-glutamine was unaffected as was most of the release of the other labelled amino acids. In medium containing an extra 24mM-MgCl2, the stimulated release of endogenous 14C-labelled glutamate, aspartate and GABA was suppressed by 75-85%, that of exogenous labelled aspartate and GABA by 50–65%, but the release of the other labelled amino acids was unaffected. The control stimulated releases of endogenous 14C-labelled glutamate, aspartate and GABA were much larger than those of other labelled amino acids but were reduced by tetrodotoxin, Ca2+-deprivation and high-Mg2+ to a level similar to that of the control stimulated releases of the other labelled amino acids. These results suggest that almost all of the stimulated release of endogenous 14C-labelled glutamate, aspartate and GABA came from nerve terminals while those of the other labelled amino acids came from other tissue elements. In addition, they are in accord with a transmitter role for glutamate, aspartate and GABA in cerebral cortex." @default.
- W2094796959 created "2016-06-24" @default.
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- W2094796959 date "1978-07-01" @default.
- W2094796959 modified "2023-10-16" @default.
- W2094796959 title "EFFECTS OF TETRODOTOXIN, CALCIUM AND MAGNESIUM ON THE RELEASE OF AMINO ACIDS FROM SLICES OF GUINEA-PIG CEREBRAL CORTEX" @default.
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- W2094796959 doi "https://doi.org/10.1111/j.1471-4159.1978.tb12447.x" @default.
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