Abstract
For more than a century, the ability to sense endotoxin (later known also as lipopolysaccharide; LPS) stood as the archetypal innate immune response: even before the phrase 'innate immunity' became popular. Yet the mechanism by which LPS initiated a signal remained unknown. The problem was solved in 1998 by positional cloning, which revealed that Toll-like receptor (TLR) 4, one of ten mammalian paralogues with homology to the Drosophila protein Toll, is the central component of the LPS receptor. During the 3 years that followed, gene knockout work supported the view that the TLRs perceive a number of indispensable molecular structures shared by diverse representatives of the microbial world. The highly specific LPS-sensing function of TLR4 is remarkable for its prevalence in Mammalia, which to the present time is the only class of the phylum Chordata known to have a gene encoding TLR4, and known to display exquisite sensitivity to LPS. The fact that LPS signals are elicited through a single biochemical pathway has raised important pharmacotherapeutic opportunities as well.
Original language | English (US) |
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Pages (from-to) | 109-120 |
Number of pages | 12 |
Journal | Current topics in microbiology and immunology |
Volume | 270 |
DOIs | |
State | Published - 2002 |
ASJC Scopus subject areas
- Immunology and Allergy
- Microbiology
- Immunology
- Microbiology (medical)