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Excitatory synapse in the rat hippocampus in tissue culture and effects of aniracetam.
Neurosci Res. 1991 Oct; 12(1):72-82.NR

Abstract

Excitatory synaptic connections between rat hippocampal neurons were established in tissue culture. The electrophysiological and pharmacological properties of these synapses were studied with the use of the tight-seal whole-cell recording technique. The excitatory postsynaptic current (EPSC) in a dissociated CA1 neuron evoked by stimulation of an explant from the CA3/CA4 region of the hippocampus had two distinct components in Mg(2+)-free medium. The fast component was abolished by the non-NMDA receptor antagonist 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) (2 microM), whereas the slow component was abolished by the N-methyl-D-aspartate (NMDA) receptor antagonist D-2-amino-5-phosphonovalerate (D-APV) (50 microM). In solution containing 1 mM Mg2+, the peak amplitude of the fast component was almost linearly related to the membrane potential. In contrast, the conductance change underlying the slow component of the EPSC was voltage-dependent with a region of negative-slope conductance in the range of -80 to -20 mV. A nootropic drug, aniracetam, increased both the amplitude and duration of the fast component of the EPSC in a concentration-dependent manner in the range of 0.1-5 mM, whereas it had no potentiating effect on the slow component. Aniracetam (0.1-5 mM) similarly increased current responses of the postsynaptic neuron to alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA). Current responses to quisqualate and glutamate in the presence of D-APV were also potentiated by aniracetam. However, neither NMDA- nor kainate-induced current was potentiated by 1 mM aniracetam.

Authors+Show Affiliations

Department of Physiology, School of Medicine, Gunma University, Maebashi, Japan.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

1684240

Citation

Ozawa, S, et al. "Excitatory Synapse in the Rat Hippocampus in Tissue Culture and Effects of Aniracetam." Neuroscience Research, vol. 12, no. 1, 1991, pp. 72-82.
Ozawa S, Iino M, Abe M. Excitatory synapse in the rat hippocampus in tissue culture and effects of aniracetam. Neurosci Res. 1991;12(1):72-82.
Ozawa, S., Iino, M., & Abe, M. (1991). Excitatory synapse in the rat hippocampus in tissue culture and effects of aniracetam. Neuroscience Research, 12(1), 72-82.
Ozawa S, Iino M, Abe M. Excitatory Synapse in the Rat Hippocampus in Tissue Culture and Effects of Aniracetam. Neurosci Res. 1991;12(1):72-82. PubMed PMID: 1684240.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Excitatory synapse in the rat hippocampus in tissue culture and effects of aniracetam. AU - Ozawa,S, AU - Iino,M, AU - Abe,M, PY - 1991/10/1/pubmed PY - 1991/10/1/medline PY - 1991/10/1/entrez SP - 72 EP - 82 JF - Neuroscience research JO - Neurosci Res VL - 12 IS - 1 N2 - Excitatory synaptic connections between rat hippocampal neurons were established in tissue culture. The electrophysiological and pharmacological properties of these synapses were studied with the use of the tight-seal whole-cell recording technique. The excitatory postsynaptic current (EPSC) in a dissociated CA1 neuron evoked by stimulation of an explant from the CA3/CA4 region of the hippocampus had two distinct components in Mg(2+)-free medium. The fast component was abolished by the non-NMDA receptor antagonist 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) (2 microM), whereas the slow component was abolished by the N-methyl-D-aspartate (NMDA) receptor antagonist D-2-amino-5-phosphonovalerate (D-APV) (50 microM). In solution containing 1 mM Mg2+, the peak amplitude of the fast component was almost linearly related to the membrane potential. In contrast, the conductance change underlying the slow component of the EPSC was voltage-dependent with a region of negative-slope conductance in the range of -80 to -20 mV. A nootropic drug, aniracetam, increased both the amplitude and duration of the fast component of the EPSC in a concentration-dependent manner in the range of 0.1-5 mM, whereas it had no potentiating effect on the slow component. Aniracetam (0.1-5 mM) similarly increased current responses of the postsynaptic neuron to alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA). Current responses to quisqualate and glutamate in the presence of D-APV were also potentiated by aniracetam. However, neither NMDA- nor kainate-induced current was potentiated by 1 mM aniracetam. SN - 0168-0102 UR - https://www.unboundmedicine.com/medline/citation/1684240/Excitatory_synapse_in_the_rat_hippocampus_in_tissue_culture_and_effects_of_aniracetam_ L2 - https://linkinghub.elsevier.com/retrieve/pii/0168-0102(91)90101-4 DB - PRIME DP - Unbound Medicine ER -