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Related Concept Videos

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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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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Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
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Defense Against Bacterial Pathogens01:31

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Related Experiment Video

Updated: Aug 28, 2025

Depletion of Specific Cell Populations by Complement Depletion
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Intracellular complement: Evidence, definitions, controversies, and solutions.

Ben C King1, Anna M Blom1

  • 1Department of Translational Medicine, Lund University, Malmö, Sweden.

Immunological Reviews
|September 14, 2022
PubMed
Summary
This summary is machine-generated.

Intracellular complement proteins perform functions inside cells, but the term lacks clear definition. This review clarifies their roles, controversies, and proposes new terminology for better understanding cellular complement activity.

Keywords:
C3CD59beta-cellsintracellular complementmicrobial infections

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • The term "intracellular complement" is emerging to describe complement protein functions within cells.
  • Current definitions are broad, leading to ambiguity in classification and localization.
  • Understanding intracellular complement is crucial for deciphering its diverse biological roles.

Purpose of the Study:

  • To review evidence for canonical and non-canonical functions of intracellular complement proteins.
  • To discuss existing controversies and unanswered questions regarding intracellular complement.
  • To propose refined terminology for accurate scientific discourse on intracellular complement.

Main Methods:

  • Literature review of existing studies on intracellular complement.
  • Analysis of evidence for complement protein localization and function within cellular compartments.
  • Synthesis of current knowledge and identification of research gaps.

Main Results:

  • Evidence supports both established (canonical) and novel (non-canonical) functions of complement proteins inside cells.
  • Significant controversies and knowledge gaps persist regarding the precise nature and localization of intracellular complement.
  • The current terminology is insufficient for precise scientific communication.

Conclusions:

  • The concept of intracellular complement requires clearer definition and standardized terminology.
  • Further research is needed to elucidate the mechanisms and specific roles of intracellular complement.
  • Refined terminology will facilitate accurate discussion and advance understanding of intracellular complement activity.