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Effects of Etomidate on GABAergic and Glutamatergic Transmission in Rat Thalamocortical Slices
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Effects of Etomidate on GABAergic and Glutamatergic Transmission in Rat Thalamocortical Slices
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Effects of Etomidate on GABAergic and Glutamatergic Transmission in Rat Thalamocortical Slices
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Journal Article
Effects of Etomidate on GABAergic and Glutamatergic Transmission in Rat Thalamocortical Slices
2016
Overview
Although accumulative evidence indicates that the thalamocortical system is an important target for general anesthetics, the underlying mechanisms of anesthetic action on thalamocortical neurotransmission are not fully understood. The aim of the study is to explore the action of etomidate on glutamatergic and GABAergic transmission in rat thalamocortical slices by using whole cell patch-clamp recording. We found that etomidate mainly prolonged the decay time of spontaneous GABAergic inhibitory postsynaptic currents (sIPSCs), without changing the frequency. Furthermore, etomidate not only prolonged the decay time of miniature inhibitory postsynaptic currents (mIPSCs) but also increased the amplitude. On the other hand, etomidate significantly decreased the frequency of spontaneous glutamatergic excitatory postsynaptic currents (sEPSCs), without altering the amplitude or decay time in the absence of bicuculline. When GABA
A
receptors were blocked using bicuculline, the effects of etomidate on sEPSCs were mostly eliminated. These results suggest that etomidate enhances GABAergic transmission mainly through postsynaptic mechanism in thalamocortical neuronal network. Etomidate attenuates glutamatergic transmission predominantly through presynaptic action and requires presynaptic GABA
A
receptors involvement.
Publisher
Springer US,Springer Nature B.V
Subject
Anesthetics, General - pharmacology
/ Animals
/ Biomedical and Life Sciences
/ Cerebral Cortex - drug effects
/ Cerebral Cortex - physiology
/ Excitatory Postsynaptic Potentials - drug effects
/ GABA-A Receptor Antagonists - pharmacology
/ gamma-Aminobutyric Acid - physiology
/ Inhibitory Postsynaptic Potentials - drug effects
/ Miniature Postsynaptic Potentials - drug effects
/ Receptors, GABA-A - physiology
/ Receptors, Presynaptic - physiology
