Ulcerative colitis (UC) is a chronic inflammatory bowel disease involving the mucosal lining of the large bowel (colon and rectum). Common symptoms include bouts of diarrhoea, rectal bleeding and abdominal pain. The pathogenesis of UC is complex and multifactorial. This thesis investigated interleukin 33 (IL-33), an alarmin of the innate immune system. IL-33 is of interest as it is found to be ...