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. 1992 May;60(5):1793–1799. doi: 10.1128/iai.60.5.1793-1799.1992

Anaerobic growth of gonococci does not alter their Opa-mediated interactions with human neutrophils.

J V Frangipane 1, R F Rest 1
PMCID: PMC257075  PMID: 1563766

Abstract

Gonococci grown anaerobically (anaerobic gonococci) in the presence of nitrite induce the expression of at least three novel outer membrane proteins (PANs 1 to 3). Although PAN 1 is expressed by gonococci during gonorrhea, the function of the PAN proteins remains unknown. In the absence of serum, gonococci possessing opacity-associated (Opa, formerly PII) outer membrane proteins adhere to, stimulate, and are phagocytically killed by human neutrophils. Gonococci lacking Opa proteins demonstrate none of these activities. We investigated whether the PAN proteins, or any other characteristics of anaerobic gonococci, altered the ability of nonpiliated, Opa+ or Opa- gonococci to adhere to, stimulate, or be phagocytically killed by neutrophils. The expression of Opa4 by strain F62, as determined by its relative mobility on sodium dodecyl sulfate-polyacrylamide gels, appeared to be unaltered by anaerobic growth, as seen previously (V. L. Clark, L. A. Campbell, D. A. Palermo, T. M. Evans, and K. W. Klimpel, Infect Immun. 55:1359-1364, 1987). Anaerobic and aerobic Opa+ gonococci adhered to and stimulated neutrophils to the same extent. Similarly, anaerobic and aerobic Opa- gonococci adhered to and stimulated neutrophils equally poorly. Finally, anaerobic and aerobic Opa+ gonococci were equally sensitive to phagocytic killing by neutrophils, while anaerobic and aerobic Opa- gonococci were equally resistant to killing. Thus, the role of Opa proteins in mediating the interactions of gonococci with human neutrophils appears unaltered by anaerobic growth, and the PAN proteins, or other cryptic properties of anaerobic gonococci, do not seem to modulate or mediate these phenomena.

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Selected References

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