The present invention relates to antibodies, antibody fragments, and related molecules that specifically bind to DR3 receptors. Such antibodies have uses, for example, in the prevention, detection, diagnosis, treatment or amelioration of a disease or disorder, especially inflammatory and autoimmune diseases and other immune system disorders, such as Crohn's disease, colitis, Inflammatory Bowel Disease, arthritis, asthma, Multiple Sclerosis, atherosclerosis, and allergic disorders. The invention also relates to nucleic acid molecules encoding anti-DR3 receptor antibodies, vectors and host cells containing these nucleic acids, and methods for producing the same. The present invention relates to methods and compositions for preventing, detecting, diagnosing, treating or ameliorating a disease or disorder, especially inflammatory or autoimmune disorders, comprising administering to an animal, preferably a human, an effective amount of one or more antibodies or fragments or variants thereof, or related molecules, that specifically bind to DR3 receptor.