Acupuncture at ST36 ameliorates experimental autoimmune encephalomyelitis via affecting the function of B cells.

Researchers investigated how acupuncture at the ST36 point (located on the lower leg) might help treat autoimmune conditions, specifically using an animal model of multiple sclerosis called experimental autoimmune encephalomyelitis (EAE). The study explored the biological mechanisms behind acupuncture's effects on the immune system. The researchers found that acupuncture at ST36 increased activity in the splenic sympathetic nerve, which is part of the nervous system that connects to the spleen. This nerve stimulation triggered important changes in immune cells, particularly B cells and CD4+ T cells, shifting them toward anti-inflammatory functions that help calm the overactive immune response seen in autoimmune diseases. When the researchers blocked this nerve pathway using a chemical called 6-OHDA, the beneficial effects of acupuncture were partially reversed, confirming the importance of this nerve connection. The study revealed that acupuncture primarily works by affecting B cells through a specific cellular signaling pathway (β2-AR-cAMP), and these B cells then influence T cells to also become more anti-inflammatory. Interestingly, when researchers tested norepinephrine (the chemical messenger released by sympathetic nerves) in laboratory dishes, it only affected T cells when B cells were present, showing that B cells play a central coordinating role. These findings help explain how acupuncture might benefit people with autoimmune conditions by modulating the immune system through nerve-immune interactions. If you're considering acupuncture for an autoimmune condition, consult with a licensed acupuncturist who can develop an appropriate treatment plan for your specific situation.

This study elucidates the neuroimmune mechanisms by which acupuncture at ST36 ameliorates experimental autoimmune encephalomyelitis (EAE). Researchers demonstrated that ST36 stimulation significantly increases splenic sympathetic nerve excitability, promoting anti-inflammatory differentiation of splenic B cells and CD4+ T cells. When splenic sympathetic innervation was ablated with 6-OHDA, acupuncture's therapeutic effects were partially reversed, confirming the critical role of sympathetic signaling. Western blot and qPCR analyses revealed that acupuncture activates the β2-adrenergic receptor-cAMP pathway in both B and CD4+ T cells, with more pronounced activation in B cells. In vitro experiments showed that norepinephrine (NE) had minimal effect on isolated CD4+ T cells but significantly promoted anti-inflammatory differentiation when B cells were co-cultured, indicating B cells as primary mediators. Clinical relevance: ST36 acupuncture may benefit autoimmune conditions through sympathetic-mediated immunomodulation, with B cells serving as the principal therapeutic target that subsequently influences T cell function.