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Complement System01:27

Complement System

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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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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
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The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
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Depletion of Specific Cell Populations by Complement Depletion
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Complement deficiencies and infections.

Carine El Sissy1, Jérémie Rosain2, Mathilde Puel3

  • 1Department of Immunology, Assistance Publique, Hôpitaux de Paris (AP-HP), Georges Pompidou European Hospital, Paris, France; University of Paris Cité, Paris, France; Inflammation, Complement and Cancer Team, Cordeliers Research Center, Institut National de la Santé et de la Recherche Médicale (INSERM) Unité Mixte de Recherche UMRS1138, Paris, France; COMET "Complement Expertise and Therapeutics", Fédération Hospitalo-Universitaire, Paris, France.

Current Opinion in Immunology
|December 20, 2025
PubMed
Summary
This summary is machine-generated.

Complement deficiencies increase infection risk, especially with encapsulated bacteria. New therapies managing complement-mediated disorders require careful monitoring for infections and proactive prevention strategies like vaccination.

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Area of Science:

  • Immunology
  • Infectious Diseases

Background:

  • The complement system is crucial for innate immunity, involved in pathogen clearance and immune response modulation.
  • Deficiencies in complement proteins lead to increased susceptibility to severe infections, particularly from encapsulated bacteria like Neisseria meningitidis and Streptococcus pneumoniae.

Purpose of the Study:

  • To review the clinical and mechanistic aspects of complement deficiencies.
  • To discuss infection risks associated with complement inhibition therapies.
  • To outline current diagnostic strategies for complement deficiencies.

Main Methods:

  • Literature review of clinical studies and mechanistic research on complement deficiencies and therapies.
  • Analysis of diagnostic approaches including functional and quantitative assays.
  • Evaluation of infectious complications linked to complement blockade.

Main Results:

  • Complement deficiencies predispose individuals to severe bacterial infections and can be associated with autoimmune and renal diseases.
  • Complement inhibition therapies, while effective for complement-mediated disorders, increase the risk of meningococcal disease and invasive fungal infections.
  • Early diagnosis through specialized assays is critical for managing patients with recurrent or early-onset infections.

Conclusions:

  • Understanding complement deficiencies is vital for managing associated infections and autoimmune conditions.
  • Therapeutic complement inhibition necessitates vigilant monitoring for novel infectious risks and implementation of preventive measures.
  • Anticipatory care, vaccination, and prophylaxis are essential as complement-targeted therapies advance.