Basal Forebrain Cholinergic Activity Modulates Isoflurane and Propofol Anesthesia.

Area of Science:

• Neuroscience
• Anesthesiology
• Sleep Research

Background:

• Cholinergic neurons in the basal forebrain (BF) are crucial for arousal.
• The precise role of BF cholinergic neurons in anesthesia recovery remains unclear.

Purpose of the Study:

• To investigate the role of BF cholinergic neurons in general anesthesia.
• To determine if activating BF cholinergic neurons can induce recovery from anesthesia.

Main Methods:

• Utilized a transgenic mouse model (ChAT-IRES-Cre).
• Employed fiber photometry with GCaMP to monitor BF neuron activity.
• Used genetic lesions and DREADDs to manipulate BF cholinergic neuron activity.
• Analyzed electroencephalogram (EEG) power spectrum changes.

Main Results:

• Isoflurane and propofol inhibit BF cholinergic neuron activity during anesthesia.
• Lesioning BF cholinergic neurons increased anesthetic potency and altered EEG power (increased δ, decreased β).
• DREADD-mediated activation of BF cholinergic neurons slowed anesthetic induction but accelerated recovery.
• Optical stimulation reduced anesthetic sensitivity but did not restore wakefulness in deeply anesthetized mice.

Conclusions:

• BF cholinergic neurons play a critical role in regulating general anesthesia.
• Inhibition of BF cholinergic neurons contributes to anesthetic-induced unconsciousness.
• Activation of BF cholinergic neurons facilitates recovery from anesthesia.