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. 1993 Jun;61(6):2419–2424. doi: 10.1128/iai.61.6.2419-2424.1993

Inhibition of human neutrophil migration in vitro by low-molecular-mass products of nontypeable Haemophilus influenzae.

D R Cundell 1, G W Taylor 1, K Kanthakumar 1, M Wilks 1, S Tabaqchali 1, E Dorey 1, J L Devalia 1, D E Roberts 1, R J Davies 1, R Wilson 1, et al.
PMCID: PMC280864  PMID: 8388863

Abstract

Nontypeable Haemophilus influenzae commonly causes infections in the lower and upper respiratory tract, although the mechanisms of its colonization and persistence in the airways are unclear. Culture filtrates from six clinical isolates of this bacterium were assessed for their abilities to influence neutrophil function in vitro. Each culture filtrate was assessed on six separate occasions with neutrophils obtained from six different donors. During the log and early stationary phases of growth (0 to 18 h), culture filtrates contained primarily neutrophil chemokinetic activity but no activity affecting neutrophil migration toward the chemotactic factors N-formyl-L-methionyl-L-leucyl-L-phenylalanine and leukotriene B4. In contrast, filtrates obtained after 24 h of culture contained factors which inhibited neutrophil migration toward both of these chemotactic factors. This chemotaxis-inhibitory activity persisted between 24 and 72 h of bacterial culture, and it was not associated with the presence of either chemotactic or chemokinetic activity as assessed by checkerboard analysis. Gel filtration of pooled 72-h filtrates yielded three major peaks of chemotaxis-inhibitory activity. Endotoxin was present together with two other low-molecular-mass hydrophobic factors of approximately 8 and 2 kDa. These low-molecular-mass factors are chloroform insoluble and heat stable, and they are inactivated by protease, periodate, and diborane reduction. Activity was completely retained on a wheat germ agglutinin column, and it could be eluted with N-acetyl-D-glucosamine. These data suggest that inhibitory activity is associated with N-acetyl-D-glucosamine-containing glycopeptides, possibly derived from the bacterial cell wall. The production of these compounds may contribute to the persistence of this bacterium in vivo by inhibiting neutrophil chemotaxis in the microenvironment of the respiratory mucosa.

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Selected References

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