Abstract
Based on Pasteur's work on the microbial nature of fermentation, it was widely believed that the presence of bacteria in the intestine was essential for the life of the host. It has also been known for decades that gut commensal microbes effect the activation and development of the systemic immune system through gut-associated lymphoid tissues (GALT). Recent extensive studies have shown that recognition of microbes is mediated by a set of germline-encoded receptors, Toll-like receptors (TLRs), in mammals. This article reviews the role of the innate immunity system in the development of GALT and the pathogenesis of inflammatory bowel diseases (IBD).
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