Electroacupuncture Attenuates Fibromyalgia Pain Through Increased PD-1 Expression in Female Mice.

Fibromyalgia causes chronic widespread pain that can persist for years, and finding effective treatments has proven challenging for both patients and doctors. Researchers at Brain Sciences investigated whether electroacupuncture—a form of acupuncture that adds mild electrical stimulation to the needles—could relieve fibromyalgia pain and how it works in the body. Using a mouse model of fibromyalgia induced by intermittent cold stress, scientists measured pain sensitivity before and after treatment. The mice with fibromyalgia showed increased sensitivity to both touch and heat, similar to what human patients experience. When treated with electroacupuncture, the mice showed significant pain relief. The researchers discovered that electroacupuncture works by activating a specific biological pathway involving proteins called PD-L1 and PD-1, which are naturally present in the nervous system. This pathway appears to reduce pain by calming overactive immune cells in the brain and spinal cord, and by lowering levels of pain-signaling molecules. The study found that electroacupuncture increased PD-1 expression in multiple areas of the nervous system involved in pain processing, including the spinal cord, brain regions, and nerve clusters near the spine. For fibromyalgia patients, these findings suggest that electroacupuncture may offer a viable treatment option by targeting the underlying biological mechanisms of chronic pain rather than just masking symptoms. While this research was conducted in mice, it provides scientific evidence for how acupuncture might work to relieve fibromyalgia pain in humans. If you're considering acupuncture for fibromyalgia, seek treatment from a licensed acupuncturist with experience in pain management.

This preclinical study investigated electroacupuncture's mechanism in treating fibromyalgia using an intermittent cold stress-induced mouse model (n=9 per group). Mice exhibited significant mechanical allodynia (2.08±0.13g on day 4) and thermal hyperalgesia (3.93±0.45s on day 4) measured via Von Frey and Hargreaves tests. Electroacupuncture treatment effectively attenuated nociceptive responses and modulated PD-1 expression levels across multiple pain-processing regions including dorsal root ganglia, spinal cord, thalamus, somatosensory cortex, and cerebellum, as confirmed by Western blot analysis. The therapeutic mechanism involves the PD-L1/PD-1 pathway, which suppressed pain-related kinase activity and inhibited microglial/astrocyte activation and Toll-like receptor 4 signaling. Intraventricular PD-L1 injection produced comparable analgesic effects to electroacupuncture, validating the pathway's role. Clinical takeaway: This study provides mechanistic evidence for electroacupuncture in fibromyalgia management through neuroimmune modulation, specifically targeting the PD-L1/PD-1 axis to reduce central sensitization and glial cell activation.