Duke researchers identify brain cells key to opioid addiction, offering path to safer pain relief

For generations, medicine has wrestled with a cruel paradox at the heart of opioid therapy — that the same chemistry which lifts suffering can also enslave the mind that seeks relief. Researchers at Duke University have now identified a small cluster of acetylcholine-releasing neurons in the nucleus accumbens that appear to govern the brain's learned craving for opioids, distinct from the dopamine pathways that deliver pain relief. By silencing opioid signaling only within these cells, scientists preserved morphine's analgesic power in mice while preventing the reward learning that seeds addic