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Complement: a unique innate immune sensor for danger signals.

Philippe Gasque1

  • 1Brain Inflammation and Immunity Group (BIIG), Department of Medical Biochemistry and Immunology, College of Medicine, University of Wales, Cardiff CF144XN, UK. gasque@cardiff.ac.uk

Molecular Immunology
|October 13, 2004
PubMed
Summary
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The complement system is vital for innate immunity, defending against microbes and bridging adaptive immunity. Understanding its intricate regulation is key to developing targeted therapies against pathogens.

Area of Science:

  • Immunology
  • Innate Immunity
  • Complement System

Background:

  • The complement (C) system is a crucial part of the innate immune response, essential for host defense against infections.
  • It plays a role in microbial defense, bridging innate and adaptive immunity, and clearing cellular debris.

Purpose of the Study:

  • To elucidate the multifaceted roles of the complement system in host defense and immune regulation.
  • To highlight the importance of understanding complement's molecular and cellular interactions for therapeutic development.

Main Methods:

  • Review of the physiological activities of the complement cascade.
  • Analysis of complement's interactions with pathogens, immune cells, and regulatory proteins.
  • Discussion of complement's role in immune complex and debris clearance.

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Main Results:

  • The complement system defends against microbes via the C5b9 complex and opsonization (C1q, C3b, iC3b) promoting phagocytosis.
  • Soluble C anaphylatoxins (C4a, C3a, C5a) modulate leukocyte responses, while CR2 bridges innate and adaptive immunity.
  • Complement facilitates clearance of immune complexes and cellular debris, aiding tissue repair.

Conclusions:

  • The complement system's functions are tightly regulated to target pathogens while protecting host cells.
  • Understanding complement's complex interactions is essential for designing targeted immunotherapies.