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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 Proteins01:23

Antimicrobial Proteins

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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.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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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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Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
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Antibody Actions01:26

Antibody Actions

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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.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
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Humoral Immune Responses01:36

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Updated: Oct 18, 2025

Bacterial Leaf Infiltration Assay for Fine Characterization of Plant Defense Responses using the Arabidopsis thaliana-Pseudomonas syringae Pathosystem
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Emerging roles of the complement system in host-pathogen interactions.

Sanjaya K Sahu1, Devesha H Kulkarni2, Ayse N Ozanturk1

  • 1Division of Pulmonary and Critical Care Medicine, Department of Medicine, Washington University School of Medicine, St. Louis, MO, USA.

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|October 3, 2021
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The complement system, traditionally viewed as fluid-phase, now shows crucial roles in host defense against diverse pathogens, including intracellular protection. This review highlights advances in understanding complement

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Area of Science:

  • Immunology
  • Microbiology
  • Pathophysiology

Background:

  • The complement system, historically recognized for fluid-phase defense against encapsulated bacteria, is increasingly understood for its broader role.
  • Recent research reveals enhanced insights into pathogen recognition, complement activation, and evasion mechanisms.
  • The discovery of locally derived and intracellular complement proteins expands our view of host defense.

Purpose of the Study:

  • To summarize recent advances in understanding the complement system's role in host defense.
  • To elucidate the mechanisms of pathogen recognition, activation, and evasion by complement.
  • To explore the function of locally derived and intracellular complement proteins.
  • To provide insights into complement dysregulation during infection.

Main Methods:

  • Literature review of recent studies on the complement system.
  • Analysis of research on pathogen-complement interactions.
  • Synthesis of findings on locally derived and intracellular complement.
  • Review of pathophysiology in complement-related infections.

Main Results:

  • The complement system's protective functions extend beyond encapsulated bacteria to non-encapsulated pathogens.
  • Specific complement proteins are key in recognizing, triggering, and evading pathogens.
  • Locally derived complement proteins significantly contribute to host defense.
  • Intracellular complement proteins offer protection and maintain barrier function during pathogen invasion.

Conclusions:

  • The complement system is a dynamic and multifaceted defense network with roles beyond the intravascular space.
  • Understanding complement's complex interactions with pathogens is crucial for developing new therapeutic strategies.
  • Dysregulation of the complement system during infection leads to significant pathophysiological changes.