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lüll Toll-like receptors II Distribution and pathways involved in TLR signalling Sandor F; Buc MFolia Biol (Praha) 2005[]; 51 (6): 188-97The innate immune system senses invading microorganisms by a phylogenetically conserved family of proteins--TLRs. They are expressed in several types of cells that represent a route of entry of pathogens into the host organism and that can contribute to protection against infection. Except for cells of the immune system, TLRs are present in epithelial cells of the skin, respiratory, intestinal, and genitourinary tracts that form the first protective barrier to invading pathogens. Polarized regulation of TLR expression in epithelial cells explains why pathogenic but not commensal bacteria elicit inflammatory responses. TLR-induced intracellular signalling pathways show remarkable complexity: apart from a common signalling pathway, additional signalling pathways specific for each of the TLRs are responsible for a fine tuning of the immune response, thus securing effective pathogen-directed biological responses.|Adaptor Proteins, Signal Transducing/*physiology[MESH]|Humans[MESH]|Ligands[MESH]|Models, Biological[MESH]|Toll-Like Receptors/*physiology[MESH]|Transcription Factors/*physiology[MESH] |