Provided are methods and compositions for treating inflammatory autoimmune diseases in a subject comprising blocking the interaction between DR3 and TL1A. The interaction between DR3 and TL1A can be blocked by reducing expression of TL1A. The interaction between DR3 and TL1A can be blocked by administration of anti-DR3 antibodies. The interaction between DR3 and TL1A can be blocked by administration of anti-TL1A antibodies. In the methods of treating inflammatory or autoimmune disease, the inflammatory or autoimmune disease can be an autoimmune disease with a T cell component. In the methods of treating inflammatory or autoimmune disease, the inflammatory or autoimmune disease can be asthma, multiple sclerosis, rheumatoid arthritis, type 1 diabetes, graft versus host disease or inflammatory bowel disease (IBD).
