The brain has a switch that shuts off chronic pain

Researchers at Washington University School of Medicine in St. Louis have identified a mechanism in mice brains that helps reduce chronic pain. Within the brain's main alert and stress center, a cluster of nerve cells can act as a natural pain reliever. However, nerve damage can disrupt this system, causing chronic pain. The study, published in Current Biology, found that certain receptors located on the surface of cells in the brain play a crucial role in shutting off the pain engine.

These receptors, specifically mu opioid receptors, can be targeted to relieve chronic neuropathic pain following nerve injury. Lead author Jordan McCall, an associate professor in the Center for Clinical Pharmacology, explains that chronic pain affects millions of adults and traditional pain medications often come with side effects, tolerance, and addiction risks.

By understanding how localized receptors in the locus coeruleus function as pain regulators, researchers hope to develop more targeted and effective pain therapies with fewer risks. Neuropathic pain occurs when damaged nerve fibers send erroneous signals to the brain, leading to shooting, stabbing, or burning sensations. The research team's next step is to explore how to manipulate the locus coeruleus without affecting receptors in other parts of the nervous system, potentially paving the way for more powerful chronic neuropathic pain treatments.