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. 1994 Mar;62(3):779–784. doi: 10.1128/iai.62.3.779-784.1994

Opsonic antibodies to outer membrane protein P2 of nonencapsulated Haemophilus influenza are strain specific.

A Troelstra 1, L Vogel 1, L van Alphen 1, P Eijk 1, H Jansen 1, J Dankert 1
PMCID: PMC186183  PMID: 8112849

Abstract

The ability of monoclonal antibodies (MAbs) specific for variable and conserved epitopes of outer membrane protein (OMP) P2 (b,c) of nonencapsulated Haemophilus influenza to promote opsonophagocytosis of this bacterium by human polymorphonuclear leucocytes (PMNs) was determined by flow cytometry. MAbs rendering PMNs fluorescent because of association with fluorescein isothiocyanate-labelled bacteria were defined as stimulating opsonophagocytosis. Opsonophagocytosis was dependent on the presence of both antibodies and complement. Of the 14 MAbs directed to the variable parts of OMP P2 (L. van Alphen, P. Eijk, L. Geelen-van den Broek, and J. Dankert, Infect. Immun. 59:247-252, 1991), 9 stimulated opsonophagocytosis. Four of the five nonopsonophagocytic MAbs that were immunoglobulin G1 were unable to cause complement activation. The MAbs promoting opsonophagocytosis included MAbs specific for one or more OMP P2 antigenic variants of H. influenzae strains isolated from patients with chronic bronchitis during persistent infection. MAbs cross-reacting in enzyme-linked immunosorbent assays with nonrelated H. influenzae did not promote opsonophagocytosis of strains from other patients. Opsonophagocytosis was not observed in the presence of three MAbs reacting with OMP P2 epitopes common in H. influenzae. These results indicate that OMP P2-dependent opsonophagocytosis of nonencapsulated H. influenzae is strictly strain specific.

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Selected References

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