Colitis in transgenic and knockout animals as models of human inflammatory bowel disease - PubMed (original) (raw)
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Colitis in transgenic and knockout animals as models of human inflammatory bowel disease
A K Bhan et al. Immunol Rev. 1999 Jun.
Abstract
Spontaneous colitis in knockout (KO) and transgenic rodents provides experimental models to study the development of mucosal inflammation and inflammatory bowel disease (Crohn's disease and ulcerative colitis). Genetic and environmental factors, particularly the normal enteric flora, are important factors in the development of mucosal inflammation. The normal mucosal homeostasis is disrupted when there is either cytokine imbalance, abrogation of oral tolerance, alteration of epithelial barrier and function or loss of immunoregulatory cells. Some but not all immunodeficiencies, in the appropriate setting, lead to colitis. CD4+ T cells have been identified as the pathogenic T cells in colitis, which mediate inflammation by either the Th1 or the Th2 pathway. The Th1 pathway dominates most colitis models and in Crohn's disease. In contrast, the colitis in TCR alpha KO mice shares many features of ulcerative colitis including the dominance of Th2 pathway in colonic inflammation. A major benefit of these models is in the development of therapeutic strategies for the treatment of inflammatory bowel disease.
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