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Infectious diseases associated with complement deficiencies.

J E Figueroa1, P Densen

  • 1Department of Internal Medicine, VA Medical Center, Iowa City, Iowa.

Clinical Microbiology Reviews
|July 1, 1991
PubMed
Summary
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The complement system is crucial for host defense, particularly against encapsulated bacteria. Deficiencies in complement pathways lead to predictable immune defects, impacting susceptibility to infections like those caused by Neisseria meningitidis.

Area of Science:

  • Immunology
  • Molecular Biology
  • Host Defense Mechanisms

Background:

  • The complement system comprises plasma and membrane proteins essential for inflammatory response, immune modulation, and host defense.
  • Complement activation involves classical and alternative pathways converging at C3, leading to membrane attack complex formation.
  • Pathogenic microbes often evolve resistance mechanisms targeting key steps in the complement cascade.

Purpose of the Study:

  • To elucidate the critical aspects of complement system function and regulation.
  • To understand how complement deficiencies correlate with specific clinical and microbiologic features.
  • To highlight the role of complement in protecting against microbial pathogens, especially encapsulated bacteria.

Main Methods:

Related Experiment Videos

  • Analysis of complement activation pathways (classical and alternative).
  • Investigation of C3 convertase formation and C3 deposition.
  • Examination of membrane attack complex assembly and insertion.
  • Classification of complement deficiency states based on disrupted mechanisms.

    • Main Results:

    • Complement deficiencies are linked to predictable defects in complement-dependent functions.
    • Deficiency states exhibit unique epidemiologic, clinical, and microbiologic characteristics.
    • The complement system is vital for defense against encapsulated bacteria like Neisseria meningitidis, Streptococcus pneumoniae, and Haemophilus influenzae.

    Conclusions:

    • Complement system integrity is critical for effective host defense against specific bacterial pathogens.
    • Understanding complement pathways and deficiencies informs strategies for preventing and treating infections.
    • Polysaccharide vaccines and antibiotics are key interventions for individuals with complement deficiencies.