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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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The grand escape - how pathogens outsmart the human complement system.

A A Nowacka1, L Sordo Vieira2, V Petr3

  • 1Institute for Systemic Inflammation Research, University of Lübeck, Lübeck, Germany.

Immunobiology
|November 4, 2025
PubMed
Summary
This summary is machine-generated.

Pathogens evade the human complement system using diverse strategies, including avoiding recognition and eradication. Understanding these complement evasion mechanisms is crucial for developing new diagnostics and therapeutics.

Keywords:
BiomarkersComplementImmune evasionInfectionPathogenTherapy

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Area of Science:

  • Immunology
  • Microbiology
  • Pathogen Biology

Background:

  • Infectious diseases cause significant global mortality and morbidity.
  • The complement system is vital for host defense against pathogens.
  • Pathogens have evolved sophisticated mechanisms to evade complement-mediated immunity.

Purpose of the Study:

  • To review and categorize pathogen strategies for evading the human complement system.
  • To highlight novel mechanisms of complement evasion, including intracellular complement.
  • To discuss the implications of complement evasion for diagnostics, therapeutics, and vaccine development.

Main Methods:

  • Literature review and synthesis of existing research on complement evasion mechanisms.
  • Categorization of evasion strategies into four main groups: avoidance of recognition, eradication, activation/function, and utilization of complement for host entry.
  • Inclusion of examples from viruses, bacteria, fungi, and protists.

Main Results:

  • Pathogens employ diverse mechanisms to evade complement, including blocking recognition, preventing lysis, inhibiting complement activation, and hijacking complement for entry.
  • Novel evasion strategies, such as the involvement of intracellular complement, are emerging.
  • Complement evasion serves both defensive and aggressive roles for pathogens.

Conclusions:

  • Complement evasion is a critical factor in pathogen survival and host invasion.
  • Understanding these mechanisms offers opportunities for developing novel diagnostic and therapeutic interventions.
  • Targeting complement evasion pathways holds promise for future vaccine development and treatment strategies.