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Abstract: 

Naloxone (Narcan) reverses opioid overdose by blocking opioid receptors, but new research clarifies its precise molecular mechanism and implications for improved treatments. Using cryo-electron microscopy, researchers captured how naloxone stabilizes the µ-opioid receptor and associated G protein in an inactive “latent” state, effectively preventing the signaling cascade that suppresses breathing during overdose. By interrupting this process at its earliest stage, naloxone rapidly restores normal function. These findings offer a detailed molecular blueprint for developing longer-lasting and more effective overdose-reversal drugs.

Keywords: Naloxone; Opioid Overdose; Mu-Opioid Receptor; G Protein Signaling; Cryo-Electron Microscopy

Affiliations:  1: University of Southern California.