Scientists discover molecular mechanism behind anesthesia-induced unconsciousness

Key Points:

• Researchers at Weill Cornell Medicine and Birkbeck, University of London, identified the binding site of the anesthetic sevoflurane on sodium ion channels, revealing how the drug stabilizes these channels in an inactive state to reduce neuronal communication.
• This discovery provides the first atomic-level view of how inhaled anesthetics dampen brain activity, explaining a mechanism behind unconsciousness and immobility during surgery that has been unclear for 175 years.
• The team used a structurally simpler bacterial sodium channel from Magnetococcus marinus to overcome challenges in studying complex mammalian channels, enabling high-resolution crystallography to locate the anesthetic binding pocket.
• Altering a single amino acid in the binding pocket disrupted sevoflurane binding and its inhibitory effect, confirming the pocket's critical role in anesthetic action.
• Ongoing research aims to translate these findings to mammalian systems to understand individual variations in anesthesia response and potentially develop safer, more selective anesthetics with fewer side effects.