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. 1996 Sep;64(9):3601–3608. doi: 10.1128/iai.64.9.3601-3608.1996

Helicobacter pylori and Porphyromonas gingivalis lipopolysaccharides are poorly transferred to recombinant soluble CD14.

M D Cunningham 1, C Seachord 1, K Ratcliffe 1, B Bainbridge 1, A Aruffo 1, R P Darveau 1
PMCID: PMC174269  PMID: 8751905

Abstract

Helicobacter pylori and Porphyromonas gingivalis are gram-negative bacteria associated with chronic inflammatory diseases. These bacteria possess lipopolysaccharides (LPSs) that are able to activate human monocytes to produce tumor necrosis factor alpha but fail to activate human endothelial cells to express E-selectin. With Escherichia coli LPS, tumor necrosis factor alpha activation requires membrane-bound CD14 and E-selectin expression requires soluble CD14 (sCD14). Therefore, the ability of H. pylori and P. gingivalis LPSs to transfer to and bind sCD14 was examined by using immobilized recombinant sCD14 and human serum or recombinant LPS-binding protein (LBP). H. pylori and P. gingivalis LPSs were transferred to sCD14 when serum or LBP was present. However, the transfer of these LPSs to CD14 in serum was significantly slower than the transfer of E. coli LPS. Quantitation of the transfer rates by Michaelis-Menten kinetics yielded K(m) values of 6 and 0.1 nM for H. pylori and E. coli LPSs, respectively. The amount of P. gingivalis LPS required to obtain half-maximum binding to CD14 was approximately 10-fold greater than the amount of E. coli LPS required. The slower transfer rates displayed by these LPSs can be explained by the poor binding to LBP observed in direct binding assays. These results are consistent with the proportionately lower ability of these LPSs to activate monocytes compared with E. coli LPS. However, the ability of H. pylori and P. gingivalis LPSs to bind LBP and transfer to sCD14 demonstrates that the lack of endothelial cell CD14-dependent cell activation by these LPSs occurs distal to sCD14 binding.

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Selected References

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