Journal
CURRENT PHARMACEUTICAL DESIGN
Volume 12, Issue 32, Pages 4215-4228Publisher
BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/138161206778743448
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Toll-like receptors (TLRs) are sensors of microbial products that initiate host defense responses in multicellular organisms. They are mainly linked to innate immunity and bridging to adaptive immunity, signaling through different TLRs responsible for a wde range of biological responses. The intracellular signaling pathways through Toll/interleukinI receptor (ILAR) domains result in recruitment of the cytoplasmic adaptor molecules, with subsequent activation of a signaling cascade leading to nuclear factor-kappa B (NF-kappa B). TLR-signaling induces host inflammatory response and the inflammation becomes more severe in the absence of several extra and intra cellular negative regulators of TLR-signaling. In the intestine, TLR-dep,-ndent activation of NF-kappa B plays a vital role in maintaining epithelial homeostasis as well as regulating infections and inflammation, while dysregulation of TLR-signaling is associated with the pathogenesis of inflammatory bowel diseases (IBD). Recent findings regarding innate immunity-mediated regulation of intestinal pathophysiology prove that development of new drugs targeting TLRs including antagonists of TLR-signaling and agonists of their negative regulators has a potential impact on therapeutic strategies for intestinal inflammatory diseases.
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