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1. The possibility of long-lasting modifications of glutamatergic responses after anoxic-aglycemic (AA) episodes was investigated in CA1 hippocampal neurons of adult slices. Bicuculline (10 microM) was continuously bath applied to block GABAA receptor-mediated currents. AA episodes were induced by brief (1.30-3 min) perfusions with a glucose free(More)
1. The effects of the putative antagonist of metabotropic glutamate receptors (mGluR), (RS)-alpha-methyl-4-carboxyphenylglycine (MCPG), were investigated in CA1 hippocampal neurons using intracellular and extracellular recordings. 2. MCPG (0.5 mM) did not antagonize the characteristic block of the slow afterhyperpolarization and spike accomodation produced(More)
1. The effects of redox reagents, 5,5'-dithiobis-2-nitrobenzoic acid (DTNB) and tris(carboxyethyl)phosphine (TCEP), on anoxia-induced long-term potentiation (LTP) were investigated in CA1 hippocampal neurons using extracellular recording techniques. Experiments were performed in the presence of 0.1 mM MgCl2 and 10 microM 6-cyano-7-nitroquinoxaline-2,3-dione(More)
1. The effects of an anoxic-aglycemic episode (1-3 min) on the pharmacologically isolated N-methyl-D-aspartate (NMDA)-mediated responses were examined in CA1 pyramidal hippocampal neurons in vitro. 2. An anoxic-aglycemic episode induced a long term potentiation (LTP) of the NMDA receptor-mediated field excitatory post-synoptic potentials (EPSPs). This LTP,(More)
In order to evaluate the role of the NMDA receptor redox site in long-term potentiation (LTP), we have investigated the effects of two redox reagents, 5,5'-dithiobis-2-nitrobenzoic acid (DTNB) and tris(carboxyethyl)phosphine (TCEP) on the induction and expression of various forms of LTP. DTNB a thiol-oxidizing agent, irreversibly reduces by 50% NMDA(More)
We examined the effects of a long-lasting application of the selective metabotropic glutamate receptor (mGluR) agonist 1S-3R, 1-amino cyclopentane-1,3-dicarboxylic acid (ACPD) on synaptic potentials recorded from the CA1 and CA3 subfields in hippocampal slices maintained in a superfusion slice chamber. In 25% of the slices, ACPD generated an slow onset(More)
We have developed a method allowing suitable morphological conservation combined with in situ hybridization, on hippocampal slices used in conventional electrophysiological studies. After a bath application of kainate (KA, 750 nM, 2 min 15 s), electrical stimulation of the mossy fibre zone evoked epileptiform activity for up to 2 h. In situ hybridization(More)
We have compared the effects of redox drugs on long-term potentiation mediated by AMPA or NMDA receptors. A reducing and an oxidizing agent had no effect on long-term potentiation mediated by AMPA receptors. In contrast, the induction of long-term potentiation mediated by NMDA receptors was prevented by a thiol oxidizing drug and restored by a disulfide(More)
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