Electroacupuncture alleviates the relapse of behaviors associated with pain sensory memory and pain-related aversive memory by activating MORs and inhibiting GABAergic neurons in the insular cortex.

Chronic pain isn't just about physical sensations—our brains can actually form memories of pain that include both the sensory experience and the negative emotions associated with it. These pain memories can cause suffering to persist long after an initial injury has healed, contributing to chronic pain conditions that are difficult to treat. Researchers investigating how electroacupuncture (EA) might help with pain memory conducted a study using mice to understand the brain mechanisms involved. The study focused on a brain region called the insular cortex, which integrates information about pain, emotion, and memory. Scientists found that electroacupuncture activated specific receptors in the brain called mu opioid receptors (MORs) in the insular cortex. This activation reduced the activity of certain nerve cells called GABAergic neurons, which are associated with pain-related negative behaviors and memories. When the mice received electroacupuncture treatment, they showed reduced relapse of behaviors linked to both pain sensation memories and pain-related emotional memories. However, when researchers blocked the mu opioid receptors in the brain, electroacupuncture lost its beneficial effect, confirming that these receptors are essential to how the treatment works. For patients struggling with chronic pain, this research provides scientific evidence for how electroacupuncture may help break the cycle of pain memory that keeps discomfort persisting. By targeting brain pathways involved in both the sensory and emotional components of pain memory, electroacupuncture may offer relief beyond temporary symptom management. If you're considering electroacupuncture for chronic pain, seek treatment from a licensed acupuncturist with specialized training in electroacupuncture techniques.

This study elucidates the neurobiological mechanisms underlying electroacupuncture's efficacy in treating pain memory relapse in a murine model. Researchers identified the insular cortex (IC) as a critical target region where EA activates μ-opioid receptors (MORs), subsequently inhibiting GABAergic neuronal activity associated with pain-related aversive behaviors. Model mice demonstrated significant alleviation of both pain sensory memory and pain-related aversive memory relapse following EA treatment. The therapeutic effect was reversed when MOR antagonists were administered to the IC, establishing MOR activation as the primary mechanism of action. GABAergic neuron activity in the IC showed strong correlation with pain-related aversive behavior manifestation. Clinical takeaway: This research provides mechanistic evidence supporting EA's role in managing chronic pain through modulation of central pain processing pathways, specifically via MOR-mediated inhibition of GABAergic transmission in the IC. The findings suggest EA may address both sensory and affective dimensions of chronic pain by targeting pain memory consolidation and retrieval, offering potential therapeutic applications beyond conventional analgesic approaches for patients with persistent pain conditions.