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- W2024571276 abstract "1. Paired recordings from monosynaptically connected CA3 interneurons and pyramidal cells of rat hippocampal slice cultures were used to compare the modulation of GABA release at synapses from distinct interneurons. 2. The group II metabotropic glutamate receptor (mGluR) agonist (2S,2'R,3'R)-2-(2',3'-dicarboxylcyclopropyl) glycine (DCG-IV, 5 muM) reduced the amplitude of IPSPs originating from stratum radiatum but not stratum oriens interneurons. In contrast, the GABAB receptor agonist (-)baclofen (10 muM) reduced the amplitude of unitary IPSPs elicited by all interneurons. 3. IPSPs mediated by stratum oriens interneurons were unaffected by the N-type calcium channel blocker omega-conotoxin MVIIA (1 muM) but were suppressed by the P/Q-type blocker omega-agatoxin IVA (200 nM). In contrast, IPSPs mediated by stratum radiatum interneurons were abolished by omega-conotoxin MVIIA. 4. Transmission dynamics were different at synapses from the two groups of interneurons. IPSPs mediated by stratum oriens interneurons showed marked paired-pulse depression (PPD) at intervals of 50 400 ms. IPSPs mediated by stratum radiatum interneurons showed paired-pulse facilitation (PPF) at 50 ms and PPD at longer intervals. 5. The amplitude of unitary IPSPs from all interneurons was unaffected by the GABAB receptor antagonist CGP52432 (2 muM) as was PPD at both 50 and 400 ms intervals. However, CGP52432 did reduce PPD of extracellularly evoked IPSPs. 6. Our results show that two groups of inhibitory synapses impinging onto CA3 pyramidal cells can be distinguished according to their dynamic and modulatory properties." @default.
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- W2024571276 date "2000-10-01" @default.
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- W2024571276 title "Differential control of GABA release at synapses from distinct interneurons in rat hippocampus" @default.
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- W2024571276 doi "https://doi.org/10.1111/j.1469-7793.2000.00123.x" @default.
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