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J Biol Chem, Vol. 274, Issue 16, 10689-10692, April 16, 1999
,
,
, and
From the Division of TLR4 is a member of the recently identified
Toll-like receptor family of proteins and has been putatively
identified as Lps, the gene necessary for potent responses
to lipopolysaccharide in mammals. In order to determine whether TLR4 is
involved in lipopolysaccharide-induced activation of the nuclear
factor-
Inflammatory Diseases and
Synthetic Chemistry, Eisai Research Institute, Andover,
Massachusetts 01810 and the ¶ Boston University School of
Medicine, Boston Medical Center, The Maxwell Finland Laboratory for
Infectious Diseases, Boston, Massachusetts 02118
B (NF-
B) pathway, HEK 293 cells were transiently
transfected with human TLR4 cDNA and an
NF-
B-dependent luciferase reporter plasmid followed by
stimulation with lipopolysaccharide/CD14 complexes. The results
demonstrate that lipopolysaccharide stimulates NF-
B-mediated gene
expression in cells transfected with the TLR4 gene in a dose- and
time-dependent fashion. Furthermore, E5531, a
lipopolysaccharide antagonist, blocked TLR4-mediated transgene
activation in a dose-dependent manner (IC50
~30 nM). These data demonstrate that TLR4 is involved in
lipopolysaccharide signaling and serves as a cell-surface co-receptor for CD14, leading to lipopolysaccharide-mediated NF-
B activation and
subsequent cellular events.
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