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Using a combination of dual recording from presynaptic and postsynaptic cells and anatomical techniques, we show that these synaptic connections often comprise a single site for liberation of excitatory transmitter. The resulting excitatory postsynaptic potentials (EPSCs) have a fast time course and a similar amplitude to miniature EPSCs recorded in tetrodotoxin and cobalt. In contrast, activation of metabotropic glutamate receptors (mGluRs) by transmitter liberated during repetitive activation of these synapses produces an excitation with a much slower time course. In addition to somatodendritic mGluRs, which excite inhibitory cells, a different species of mGluR is present on inhibitory cell terminals. This mGluR is activated by higher concentrations of the agonist t\u20101\u2010amino\u2010cyclopentyl\u20131,3\u2010decarboxylate and acts to reduce \u03b3\u2010aminobutyric acid release. mGluRs, thus, have a dual action to enhance and to depress synaptic inhibition in the hippocampus. \u00a9 1995 John Wiley &amp; Sons, Inc.<\/jats:p>","DOI":"10.1002\/neu.480260310","type":"journal-article","created":{"date-parts":[[2005,1,1]],"date-time":"2005-01-01T03:49:00Z","timestamp":1104551340000},"page":"386-395","source":"Crossref","is-referenced-by-count":9,"title":["Fast and slow excitation of inhibitory cells in the CA3 region of the hippocampus"],"prefix":"10.1002","volume":"26","author":[{"given":"Jean\u2010Christophe","family":"Poncer","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard","family":"Miles","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2004,10,11]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1994.sp020448"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/363347a0"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/0896-6273(93)90086-7"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.8093417"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/361031a0"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1101\/SQB.1990.055.01.009"},{"key":"e_1_2_1_8_1","first-page":"18","article-title":"Endogenous opioids released from mossy fibre modulate norepinephrine actions and inhibitory postsynaptic potentials in guinea\u2010pig CA3 pyramidal cell","volume":"258","author":"Caudle R. 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