Previous Article | Next Article ![]()
Infect. Immun., 01 1995, 253-258, Vol 63, No. 1
TS Parker, DM Levine, JC Chang, J Laxer, CC Coffin and AL Rubin
We have tested hypotheses relating lipoprotein structure to function as
measured by the relative ability to neutralize endotoxin by comparing
natural human lipoproteins, a chemically defined form of reconstituted
high-density lipoprotein (R-HDL), and a lipid emulsion (Intralipid). The
human whole-blood system was used as an in vitro model of
lipopolysaccharide (LPS) binding protein and CD14-dependent activation of
cytokine production. When lipoproteins were compared on the basis of
protein content, R-HDL was most effective in reducing tumor necrosis factor
alpha (TNF-alpha) production followed in order by very low density
lipoprotein, low-density lipoprotein, Intralipid, and natural HDL. However,
when these particles were compared by protein, phospholipid, cholesterol,
or triglyceride content by stepwise linear regression analysis, only
phospholipid was correlated to effectiveness (r2 = 0.873; P < 0.0001).
Anti-CD14 monoclonal antibodies MY4 and 3C10 inhibited LPS binding protein
and CD14-dependent activation of TNF- alpha production by LPS at LPS
concentrations up to approximately 1.0 ng/ml. R-HDL (2 mg of protein per
ml) blocked TNF-alpha production by LPS from both smooth- and rough-type
gram-negative bacteria at concentrations up to 100 ng of LPS per ml but had
little effect on heat- killed gram-positive Staphylococcus aureus and no
effect on other LPS- independent stimuli tested. These results support our
hypothesis that LPS is neutralized by binding to phospholipid on the
surface of R-HDL and demonstrate that R-HDL is a potent inhibitor of the
induction of TNF-alpha by LPS from both rough- and smooth-form
gram-negative bacteria in whole human blood.
Copyright © 1995, American Society for Microbiology
Reconstituted high-density lipoprotein neutralizes gram-negative bacterial lipopolysaccharides in human whole blood
Rogosin Institute, New York Hospital-Cornell Medical Center, New York 10021.
This article has been cited by other articles:
| J. Bacteriol. | J. Virol. | Eukaryot. Cell |
|---|
| Microbiol. Mol. Biol. Rev. | Clin. Vaccine Immunol. | All ASM Journals |
|---|