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- W2018465670 abstract "Following micropressure application of glutamate (500 μM) in stratum lacunosum-moleculare (L-M), inhibitory postsynaptic potentials (glut-IPSPs) were recorded in CA1 pyramidal cells. These glut-IPSPs were blocked by tetrodotoxin (1 μM) and, thus, were probably generated by the activation of local interneurons. The effects of pharmacological antagonists on glut-IPSPs and on electrically-evoked early and late IPSPs were assessed in the same cells during the same application of the antagonist. Local application of the GABAB antagonist 2-OH saclofen (1–4 mM) reduced both glut-IPSPs and late IPSPs but not early IPSPs. In contrast, the GABAB antagonist phaclofen (20 mM) reduced late IPSPs but not early IPSPs or glut-IPSPs. Early IPSPs were blocked by the GABAA antagonists bicuculline and picrotoxin but late IPSPs and glut-IPSPs were not. Repetitive electrical stimulation depressed early and late IPSPs as well as glut-IPSPs, suggesting that interneurons activated with glutamate were also stimulated electrically. Thus, interneurons in str. lacunosum-moleculare appear to inhibit pyramidal cells via a GABAB receptor-mediated IPSP. The discrepancy in the pharmacological profile of the GABAB glut-IPSPs and of the GABAB late IPSPs may suggest the presence of two GABAB mechanisms in CA1 pyramidal cells. © 1992 Wiley-Liss, Inc." @default.
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- W2018465670 date "1992-07-01" @default.
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- W2018465670 title "GABAB receptor-mediated inhibitory postsynaptic potentials evoked by electrical stimulation and by glutamate stimulation of interneurons inStratum lacunosum-moleculare in hippocampal CA1 pyramidal cells in vitro" @default.
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- W2018465670 doi "https://doi.org/10.1002/syn.890110309" @default.
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