A cholinergic hub in the nucleus accumbens gates opioid-reward learning.

Blocking cholinergic interneurons in the nucleus accumbens prevents opioid-reward learning without affecting dopamine signaling, revealing a key cholinergic gate.

• Why it matters: Understanding how opioid reward learning occurs independently of dopamine could help develop strategies to prevent addiction while preserving pain relief, addressing a critical gap in addiction research.
• What they did: Researchers used a cell-specific analogue of naloxone called naloxone DART to target cholinergic interneurons in the nucleus accumbens of genetically defined subjects, rendering these cells insensitive to morphine.
• The result: This intervention abolished morphine-conditioned place preference without impairing locomotion or analgesia, highlighting a cholinergic pathway that controls reward learning and offering avenues for safer opioid therapies.