Electroacupuncture Modulates Programmed Cell Death 1 Ligand 1 on Peripheral and Central Nervous Systems in a Mouse Fibromyalgia Pain Model.

Fibromyalgia is a challenging chronic pain condition that causes widespread body pain lasting months or years, often accompanied by fatigue, sleep problems, anxiety, and difficulty concentrating. Because there are no clear medical tests to diagnose or track fibromyalgia, it remains one of the most difficult pain conditions to treat effectively.

Researchers recently investigated how electroacupuncture might help fibromyalgia pain using a mouse model. They created fibromyalgia-like symptoms in mice by exposing them to repeated cold stress, which caused the animals to become overly sensitive to both touch and heat. The research team then tested whether electroacupuncture could reduce this pain sensitivity.

The study found that electroacupuncture successfully reduced pain responses in the fibromyalgia mice. The researchers discovered that the treatment worked by affecting a specific protein called PD-L1 (programmed cell death 1 ligand 1) in both the peripheral nerves and central nervous system. In fibromyalgia mice, levels of PD-1 (the receptor for PD-L1) were lower in pain-processing areas of the nervous system, while pain-promoting enzymes were elevated. Electroacupuncture reversed these changes, bringing the protein levels back toward normal and reducing pain sensitivity.

This research helps explain one biological mechanism through which electroacupuncture may relieve fibromyalgia pain. While this was an animal study and human research is needed, it provides scientific evidence supporting electroacupuncture as a potential treatment option for fibromyalgia patients. The findings suggest that electroacupuncture may work by modulating immune-related proteins in the nervous system that control pain signaling. If you're considering acupuncture for fibromyalgia, seek treatment from a licensed acupuncturist experienced in treating chronic pain conditions.

This murine study investigated PD-L1/PD-1 mechanisms in fibromyalgia pain and electroacupuncture's modulatory effects. Researchers induced fibromyalgia using intermittent cold stress (ICS), producing mechanical hyperalgesia (2.26 ± 0.18 g von Frey threshold) and thermal hyperalgesia (4.36 ± 0.31 s Hargreaves test). The ICS model demonstrated decreased PD-1 expression in dorsal root ganglia, spinal cord, thalamus, and somatosensory cortex, with concurrent elevation of pain-related kinases. Electroacupuncture treatment reversed these pathological changes, normalizing PD-1 levels and reducing kinase activity. The therapeutic effects of EA were comparable to intracerebral PD-L1 injection and Trpv1 deletion, suggesting EA modulates fibromyalgia pain through PD-L1/PD-1 immune checkpoint pathways. Clinical takeaway: This research provides mechanistic evidence that electroacupuncture modulates neuroimmune signaling via PD-L1/PD-1 pathways in fibromyalgia, supporting its clinical application and identifying potential biomarkers for treatment response monitoring in fibromyalgia patients.