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. 1989 May;67(1):87–91.

Antibody to the outer membrane proteins is the dominant opsonic antibody in normal human serum against H. influenzae type b.

S V Hetherington 1
PMCID: PMC1385293  PMID: 2786843

Abstract

We hypothesized that the predominant opsonic antibody of normal serum is directed against outer membrane proteins (OMP). Sera from 10 normal adults were tested for their opsonic capacity against Haemophilus influenzae b (Eagan strain) by the luminol-enhanced neutrophil chemiluminescence elicited on incubation with serum-opsonized bacteria, and the ability to deposit C3 on the bacterial surface. Peak chemiluminescence correlated with the amount of C3 on the bacterial surface (r = 0.71, P less than 0.025) and this, in turn, correlated with the concentration of IgG directed against outer membrane proteins, (r = 0.75, P less than 0.01), but not with the concentration of anticapsular polysaccharide antibody. Two groups of sera were easily distinguished based on the chemiluminescence experiments: a high opsonic group (greater than 50,000 peak counts per second; c.p.s.) and a low opsonic group (less than 10,000 c.p.s.). The IgG fraction from the high opsonic sera could augment C3 deposition when added to a low opsonic serum, but could not after absorption of the anti-OMP antibody by affinity chromatography. We conclude that the predominant opsonin of normal serum is antibody to outer membrane proteins, a finding which could be significant for the development of future vaccines against H. influenzae b.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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