Journal
TRENDS IN IMMUNOLOGY
Volume 23, Issue 11, Pages 509-512Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S1471-4906(02)02317-7
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Toll-like receptors (TLRs) have a crucial role in regulating immunity against microbial agents. Recent studies indicate that these receptors might also have an important role in regulating responses to endogenous stimuli, such as necrotic cells, heat-shock proteins and extracellular matrix breakdown products. Specifically, TLR2 and TLR4 were shown to mediate expression of inflammatory genes and trigger dendritic-cell 'maturation' by these agents. These intriguing findings suggest that the ancient family of TLRs are involved in the recognition, not only of microbes, but also of endogenous harmful stimuli. However, potential complications associated with microbial contamination of endogenous agents and the specific nature of in vivo responses induced by these agents remain to be determined.
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