Ketamine suppresses synchronized discharges in the disinhibited amygdala slice

Po-Wu Gean, Chang Fang-Chia

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The effect of ketamine on the paroxysmal depolarizing shift (PDS) induced by bicuculline was studied in rat amygdala slices using intracellular recording techniques. Stimulation of the ventral endopyriform nucleus evoked an excitatory postsynaptic potential (EPSP). After exposure to bicuculline (20 μM), the same stimulus intensity evoked burst firing. Superfusion of ketamine reversibly reduced the duration of PDS. Pretreatment of amygdala slices with DL-2-amino-5-phosphonovaleate (DL-APV, 50 μM) occluded the effect of ketamine suggesting that ketamine shortened the burst duration via its blocking action on the NMDA receptors. In all neurons tested, a large depolarizing shift remained in the presence of ketamine. The ketamine-resistant component was blocked by 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX, 8 μM) indicating its mediation by the non-NMDA receptors.

Original languageEnglish
Pages (from-to)923-927
Number of pages5
JournalBrain Research Bulletin
Volume26
Issue number6
DOIs
Publication statusPublished - 1991 Jan 1

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Ketamine
Amygdala
6-Cyano-7-nitroquinoxaline-2,3-dione
Bicuculline
Excitatory Postsynaptic Potentials
N-Methyl-D-Aspartate Receptors
Neurons

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

Cite this

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abstract = "The effect of ketamine on the paroxysmal depolarizing shift (PDS) induced by bicuculline was studied in rat amygdala slices using intracellular recording techniques. Stimulation of the ventral endopyriform nucleus evoked an excitatory postsynaptic potential (EPSP). After exposure to bicuculline (20 μM), the same stimulus intensity evoked burst firing. Superfusion of ketamine reversibly reduced the duration of PDS. Pretreatment of amygdala slices with DL-2-amino-5-phosphonovaleate (DL-APV, 50 μM) occluded the effect of ketamine suggesting that ketamine shortened the burst duration via its blocking action on the NMDA receptors. In all neurons tested, a large depolarizing shift remained in the presence of ketamine. The ketamine-resistant component was blocked by 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX, 8 μM) indicating its mediation by the non-NMDA receptors.",
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Ketamine suppresses synchronized discharges in the disinhibited amygdala slice. / Gean, Po-Wu; Fang-Chia, Chang.

In: Brain Research Bulletin, Vol. 26, No. 6, 01.01.1991, p. 923-927.

Research output: Contribution to journalArticle

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