Claustrum modulates behavioral sensitivity and EEG activity of propofol anesthesia

Area of Science:

• Neuroscience
• Anesthesiology
• Consciousness Studies

Background:

• The claustrum is implicated in conscious control.
• Claustrum damage or stimulation affects awareness.
• General anesthetics may target the claustrum.

Purpose of the Study:

• To investigate the claustrum's role in propofol anesthesia.
• To determine if claustral neurons modulate anesthetic effects.
• To examine the involvement of GABAa receptors in the claustrum during anesthesia.

Main Methods:

• Fiber photometry recorded claustral neuronal activity during propofol anesthesia.
• Chemogenetics activated claustral neurons to assess anesthetic sensitivity.
• Microinjections of GABAa receptor agonist (muscimol) and antagonist (gabazine) into the claustrum.
• Electroencephalography (EEG) and behavioral indicators were analyzed.

Main Results:

• Claustrum neuronal activity decreased during propofol-induced unconsciousness and recovered upon emergence.
• Chemogenetic activation of claustrum neurons attenuated propofol sensitivity and shortened anesthesia duration.
• GABAa receptor manipulation in the claustrum bidirectionally controlled propofol sensitivity.
• Inhibiting claustrum GABAa receptors increased cortical slow waves.

Conclusions:

• Claustrum neurons and their GABAa receptors modulate propofol anesthesia.
• Findings support the claustrum's role in consciousness modulation.
• This research offers insights into anesthetic brain targets.