Original Literature | Model OverView |
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Publication
Title
LPS-binding proteins and receptors.
Affiliation
The Pulmonary Center, Boston University School of Medicine, MA 02118, USA.mfenton@bupula.bu.edu
Abstract
Macrophage activation by gram-negative lipopolysaccharide (LPS) has beenextensively studied in an attempt to define the mechanisms that underlie innateimmunity against bacterial pathogens. Dysregulation of these same mechanismscontributes to the pathophysiological consequences of bacterial sepsis. Thebiological actions of LPS are mediated, at least in part, by both LPS-bindingproteins and LPS receptors. Several LPS receptors (CD14, the macrophagescavenger receptor, and the beta2 integrins), as well as the serum LPS-bindingprotein LBP, have been cloned and studied in detail. In addition, insightsgained through the use of LPS antagonists have led to a better understanding ofa molecule believed to function in conjunction with LPS receptors to transducesignals from the membrane to the cytosol. More recently, the use of knockoutmice has greatly expanded our knowledge of the biology of LPS receptors andbinding proteins. This review will summarize various phenotypes of mice thatlack genes encoding CD14, the scavenger receptor, and LBP. These knockout micehave revealed several unexpected features of LPS action in vivo. Together, theseanimal models may provide a means to develop and evaluate novel therapeuticapproaches to the control of endotoxin shock.
PMID
9665271
|
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sCD14
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--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c1 : 1
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m5*m12*0.1
nodelay
--
0
PMID: 9665271, 2471708 LBP clearly binds LPS (and LPS substructures, such as lipid IVa) through the recognition of lipid A.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c31 : 1
stoichiometry:c33 : 1
stoichiometry:c35 : 1
m24*m23*0.1
nodelay
--
0
PMID: 9665271 high concentrations of Taxol induced minimal interferoninducible protein-10 (IP-10) expression in the CD14-/- mice, even though induction of TNF-a and interleukin-1b expression occurred.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c32 : 1
stoichiometry:c34 : 1
stoichiometry:c36 : 1
m25*m23*0.1
nodelay
--
0
PMID: 9665271 high concentrations of Taxol induced minimal interferoninducible protein-10 (IP-10) expression in the CD14-/- mice, even though induction of TNF-a and interleukin-1b expression occurred.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c37 : 1
stoichiometry:c38 : 1
stoichiometry:c39 : 1
m28*m5*0.1
nodelay
--
0
PMID: 9665271 In the case of LPS activation of IL-6 expression, CD14-independent induction of IL-6 expression does not appear to involve monocytic cells, whereas maximal expression of IL-6 in vivo still requires both macrophages and CD14-dependent signaling.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c40 : 1
stoichiometry:c41 : 1
stoichiometry:c42 : 1
m13*m25*0.1
nodelay
--
0
PMID: 9665271 LPS-inducible IP-10 expression in vivo appears to be the most dependent on CD14-dependent signaling.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c43 : 1
stoichiometry:c44 : 1
stoichiometry:c45 : 1
m24*m13*0.1
nodelay
--
0
PMID: 9665271 TNF-alpha and IL-1b expression can be induced by both CD14-dependent and -independent pathways.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c46 : 1
stoichiometry:c47 : 1
stoichiometry:c55 : 1
m22*m13*0.1
nodelay
--
0
PMID: 9665271 TNF-alpha and IL-1b expression can be induced by both CD14-dependent and -independent pathways.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c48 : 1
stoichiometry:c49 : 1
stoichiometry:c50 : 1
m30*m5*0.1
nodelay
--
0
PMID: 9665271 High levels of SR-A expression by activated macrophages may favor the uptake of LPS by this receptor, thus leading to a net reduction in free LPS that would be available to bind CD14.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c51 : 1
stoichiometry:c52 : 1
stoichiometry:c53 : 1
m32*m5*0.1
nodelay
--
0
PMID: 9665271 Three cloned molecules expressed on the surface of monocytes and macrophages are known to bind the lipid A moiety of LPS. These include CD14, the macrophage scavenger receptor (SR), and the beta2 leukocyte integrins (CD11a/CD18, CD11b/ CD18, and CD11c/CD18; this family of receptors herein will be referred to as CD11/18).
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c56 : 1
stoichiometry:c57 : 1
stoichiometry:c58 : 1
m13*m28*0.1
nodelay
--
0
PMID:9665271 In the case of LPS activation of IL-6 expression, CD14-independent induction of IL-6 expression does not appear to involve monocytic cells, whereas maximal expression of IL-6 in vivo still requires both macrophages and CD14-dependent signaling.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c59 : 1
stoichiometry:c61 : 1
stoichiometry:c60 : 1
m24*m5*0.1
nodelay
--
0
PMID: 9665271 TNF-alpha and IL-1b expression can be induced by both CD14-dependent and -independent pathways.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c4 : 1
stoichiometry:c5 : 1
stoichiometry:c6 : 1
stoichiometry:c7 : 1
m11*m6*0.1
nodelay
--
0
PMID: 99652871, 7505800, 1698311, 1607653, 8666811 LPS binds stoichiometrically to CD14. LBP moves LPS onto CD14.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c64 : 1
stoichiometry:c65 : 1
stoichiometry:c66 : 1
m34*m30*0.1
nodelay
--
0
PMID: 9665271 The SR-A is expressed by activated macrophages and able to bind a broad range of polyanionic ligands, including LPS, modified lipoproteins, and lipoteichoic acid of Gram-positive bacteria.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c62 : 1
stoichiometry:c63 : 1
stoichiometry:c67 : 1
m35*m30*0.1
nodelay
--
0
PMID: 9665271 The SR-A is expressed by activated macrophages and able to bind a broad range of polyanionic ligands, including LPS, modified lipoproteins, and lipoteichoic acid of Gram-positive bacteria.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c8 : 1
stoichiometry:c9 : 1
stoichiometry:c10 : 1
m12*m14*0.1
nodelay
--
0
PMID: 9665271 LBP mediates the transfer of LPS and/or the inhibitors onto CD14. PMID: 9665271 This model reflects our findings that the LPS-like molecules RSLA and lipid IVa function as antagonists in human macrophages
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c11 : 1
stoichiometry:c12 : 1
stoichiometry:c13 : 1
stoichiometry:c14 : 1
m11*m15*0.1
nodelay
--
0
PMID: 9665271 LBP mediates the transfer of LPS and/or the inhibitors onto CD14. PMID: 9665271 This model reflects our findings that the LPS-like molecules RSLA and lipid IVa function as antagonists in human macrophages
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c15 : 1
stoichiometry:c16 : 1
stoichiometry:c18 : 1
stoichiometry:c17 : 1
stoichiometry:c54 : 1
m17*m13*0.1
nodelay
--
0
PMID: 9665271 CD14 then transfers the ligand to a signal transducer (shown here as a transmembrane molecule). LPS inhibitors prevent the transfer of LPS from CD14 to its associated signal transducer.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c19 : 1
stoichiometry:c20 : 1
stoichiometry:c21 : 1
m5*m11*0.1
nodelay
--
0
PMID: 9665271 the engagement of LPS by CD14 that occurs in tissues does not always occur as an LBP-mediated event.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c22 : 1
stoichiometry:c23 : 1
stoichiometry:c24 : 1
m19*m5*0.1
nodelay
--
0
PMID: 9665271 LPS interacts with high concentrations of locally secreted sCD14.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c28 : 1
stoichiometry:c29 : 1
stoichiometry:c30 : 1
m23*m22*0.1
nodelay
--
0
PMID: 9665271 high concentrations of Taxol induced minimal interferoninducible protein-10 (IP-10) expression in the CD14-/- mice, even though induction of TNF-a and interleukin-1b expression occurred.
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c25 : 1
stoichiometry:c27 : 1
stoichiometry:c26 : 1
m22*m5*0.1
nodelay
--
0
PMID: 9665271 residual TNF-a production in response to LPS challenge was observed in the CD14-/- mice.
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