Researchers at the Feinstein Institutes for Medical Research, the research arm of New York-based Northwell Health, illuminated the precise pathway from the brainstem to the spleen that controls inflammation in a study published in the Proceedings of the National Academy of Sciences of the United States of America (PNAS). Essentially, the work demonstrates how scientists could use the vagus nerve to hack the immune system, enabling them to turn down the excessive response that underlies autoimmune disease without the use of biologics or immunosuppressive drugs.