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- W2000407663 abstract "The direct activation of metabotropic glutamate receptors (mGluRs) by 1S,3R-aminocyclopentane dicarboxylate (1S,3R-ACPD), has previously been shown to induce a relatively fast (maximum at 10 min) and slow (90 min) onset long-term potentiation (LTP) of synaptic transmission in the hippocampus. Here we report the first evidence for a relatively fast onset LTP of synaptic transmission in the immature male rat (50-100 g) dentate gyrus in vitro by application of the mGluR type I agonist, (S)-3,5-dihydroxyphenylglycine ((S)-DHPG; 20 microM). Bath application of (S)-DHPG caused a transient depression of the field excitatory postsynaptic potential (EPSP) slope, followed after washout by a relatively rapidly developing potentiation of synaptic transmission to a maximum increase at 12-15 min (161.1 +/- 11.4% compared to controls at 15 min; n = 8). This effect was not observed following perfusion with the enantiomer (R,S)-DHPG at the same dose. The (S)-DHPG potentiation occluded tetanically induced LTP and vice versa. The potentiation was antagonised by the non-specific mGluR antagonist (R,S)-alpha-methyl-4-carboxyphenylglycine ((R,S)-MCPG) at high doses (500-1000 microM) but was unaffected in the presence of the N-methyl-D-aspartate (NMDA) receptor blocker, D(-)-2-amino-5-phosphonopentanoic acid (D-AP5; 50 microM). Our results demonstrate a robust NMDA-independent LTP induced by (S)-DHPG that occludes tetanically induced LTP." @default.
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- W2000407663 date "1997-06-01" @default.
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- W2000407663 title "Potentiation of synaptic transmission in the rat dentate gyrus in vitro by (S)-3,5-dihydroxyphenylglycine ((S)-DHPG)" @default.
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- W2000407663 doi "https://doi.org/10.1016/s0304-3940(97)00404-7" @default.
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