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Related Experiment Videos

Complement components and receptors: deficiencies and disease associations.

W R Bartholomew1, T C Shanahan

  • 1Erie County Medical Center, Erie County Laboratory, Buffalo, New York.

Immunology Series
|January 1, 1990
PubMed
Summary

The complement system is crucial for fighting bacterial infections and clearing immune complexes. Deficiencies in complement components or receptors lead to increased susceptibility to infections and autoimmune diseases.

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Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • The complement system comprises interdependent components and receptors vital for immune responses.
  • In vitro studies have detailed complement functions, but in vivo studies highlight their critical importance.

Purpose of the Study:

  • To underscore the in vivo importance of complement components and receptors in host defense and immune complex clearance.
  • To elucidate the consequences of deficiencies in specific complement components (C3, C1, C2, C4) and receptors (CR3, CR1) on infection susceptibility and autoimmune disease.

Main Methods:

  • Analysis of natural in vivo experiments and clinical observations of individuals with complement deficiencies.
  • Examination of the roles of complement fixation, ligand-receptor interactions (C3b-CR3), and the membrane attack complex in bacterial clearance.

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  • Investigation of the link between early complement component deficiencies, CR1 receptor function, and immune complex processing.

    • Main Results:

    • Phagocytosis of pyogenic bacteria is enhanced by C3 fixation; C3 or CR3 deficiency leads to pyogenic infections.
    • C3 deficiency impairs leukocytic infiltration due to lack of C5a, while CR3 deficiency allows it.
    • Intact membrane attack complex (C5-C9) is essential for Neisseria lysis; deficiencies increase susceptibility to Neisseria infections.
    • Deficiencies in early complement components (C1, C2, C4) or CR1 receptors are associated with autoimmune diseases due to impaired immune complex clearance.

    Conclusions:

    • The complement system, particularly C3 and its receptor CR3, is essential for effective phagocytosis and defense against pyogenic bacteria.
    • The membrane attack complex is critical for lysing Neisseria, and its absence leads to severe infections.
    • Proper functioning of early complement components and erythrocyte CR1 receptors is vital for clearing immune complexes and preventing autoimmune pathology.