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Mechanisms of stable serum resistance of Neisseria gonorrhoeae

  • Section 5: Pathogenesis
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Abstract

Neisseria gonorrhoeae that resist complement-dependent killing by normal human serum (NHS) are sometimes killed by immune convalescent sera from patients recovering from disseminated gonococcal infection (DGI). In these studies, killing by immune serum was prevented or blocked by immunoglobulin G (IgG) or F(ab′)2 isolated from NHS. Purified human IgG antibodies directed against gonococcal protein III, contained most of the blocking activity in IgG. In addition, immune convalescent DGI serum, which did not exhibit bactericidal activity, was restored to killing by selective immunodepletion of protein III antibodies. Blocking IgG or F(ab′)2 prepared from IgG, partially inhibited binding of bactericidal antibody to N. gonorrhoeae. Also, binding of a monoclonal antibody recognizing N. gonorrhoeae outer membrane protein PIII was almost completely inhibited by blocking F(ab′)2.

Presensitization of N. gonorrhoeae with increasing concentrations of blocking IgG or F(ab′)2 before incubation with bactericidal antibody and an antibody free source of complement, increased consumption and deposition of the third component of human complement (C3) and the ninth component of complement (C9) but inhibited killing in dose-related fashion.

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Authors and Affiliations

  1. The Maxwell Finland Laboratory for Infectious Diseases, Boston City Hospital, Boston University School of Medicine, 774 Albany Street, 02118, Boston, MA, USA

    P. A. Rice

  2. The Rockefeller University of New York, 10021, NY, USA

    M. S. Blake

  3. The National Institute of Allergy and Infectious Diseases, National Institutes of Health, 20205, Bethesda, MD, USA

    K. A. Joiner

Authors
  1. P. A. Rice
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  2. M. S. Blake
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  3. K. A. Joiner
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Rice, P.A., Blake, M.S. & Joiner, K.A. Mechanisms of stable serum resistance of Neisseria gonorrhoeae . Antonie van Leeuwenhoek 53, 565–574 (1987). https://doi.org/10.1007/BF00415518

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  • DOI: https://doi.org/10.1007/BF00415518

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