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Understanding Gastrointestinal Inflammation — Implications for Therapy

It is now apparent that the immune system at the intestinal mucosal surface (eg, gutassociated lymphoid tissue-[GALT]) has distinct structural and functional features. Indeed, the GALT is a most complex organ which intimately interfaces between the environment and the host organism. These functions include tolerance to orally administered antigens, local protective immune responses at the B and T cell level, and systemic and mucosal dissemination of stimulated B and T lymphocytes. In addition, animal models of intestinal inflammation have shown that disturbances in immune regulation lead to mucosal inflammation. A breakdown in mucosal tolerance is likely to be a key feature in the development of chronic gastrointestinal inflammation, such as seen with inflammatory bowel disease (Duchmann et al 1995).