Toll-like receptors: lessons from knockout mice |
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Authors: | Akira S |
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Affiliation: | Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamada-oka, Suita, Osaka 565-0871, Japan. sakira@biken.osaka-u.ac.jp |
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Abstract: | The Toll signalling pathway, which is required for establishment of dorsoventral polarity in Drosophila embryos, plays an important role in the response to microbial infections. Recently, Toll-like receptors (TLRs) have also been identified in mammals. TLR4 has been shown to function as the transmembrane component of the lipopolysaccharide receptor, while TLR2 recognizes peptidoglycans from Gram-positive bacteria, lipoproteins and yeast. Although various microbial cell-wall components are recognized by different receptors, all of these responses are abrogated in MyD88-deficient cells. These results show that different TLRs recognize different microbial cell-wall components, and that MyD88 is an essential signalling molecule shared among interleukin-1 receptor/Toll family members. |
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