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Updated: Mar 20, 2026

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention
Published on: October 16, 2013
Subtype-specific modulation of inhibitory interneurons by general anesthetics
Taisuke Sugino1, Takuya Okada1, Yuki Nomura1
1Division of Anesthesiology, Department of Surgery Related, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.
Ketamine uniquely activates more excitatory and somatostatin (SST) interneurons compared to isoflurane and propofol. This selective neuronal activation reveals distinct cortical changes during general anesthesia.
Area of Science:
- Neuroscience
- Anesthesiology
- Cell Biology
Background:
- Mechanisms of general anesthesia-induced loss of consciousness are not fully understood.
- Cell-type-specific effects of anesthetics on cortical circuits require further investigation.
Purpose of the Study:
- To compare the cell-type-specific effects of isoflurane, propofol, and ketamine on cortical neurons.
- To elucidate distinct cortical circuit reconfigurations induced by different anesthetics.
Main Methods:
- Utilized *in vivo* two-photon calcium imaging in mouse somatosensory cortex.
- Compared anesthetic effects on excitatory neurons and inhibitory interneuron subtypes (PV and SST) at equivalent sedative depths.
- Analyzed neuronal activity changes at both population and subtype levels.
Main Results:
- All anesthetics suppressed overall excitatory and inhibitory neuronal activity.
- Ketamine uniquely increased the activity fraction of excitatory neurons (17.6%) compared to isoflurane (4.0%) and propofol (4.1%).
- Ketamine preferentially activated somatostatin (SST) interneurons (25.9%) compared to other anesthetics, while PV interneurons showed no significant differences.
Conclusions:
- Ketamine exhibits distinct effects by selectively enhancing activity in specific excitatory and SST interneuron populations.
- These findings reveal a unique cortical network reconfiguration associated with ketamine's anesthetic action.
- Understanding cell-type-specific anesthetic effects is crucial for deciphering the neurobiology of consciousness.
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