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Related Concept Videos

Complement System01:27

Complement System

11.5K
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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Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
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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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Humoral Immune Responses01:36

Humoral Immune Responses

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Overview
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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.
Phagocytes
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.
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Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
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The Complement System in Flavivirus Infections.

Jonas N Conde1, Emiliana M Silva1, Angela S Barbosa2

  • 1Laboratório de Genômica Estrutural, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro Rio de Janeiro, Brazil.

Frontiers in Microbiology
|March 7, 2017
PubMed
Summary
This summary is machine-generated.

Flavivirus infections are rising globally. This review explores how the complement system, a key immune defense, impacts flavivirus infections like dengue and West Nile virus.

Keywords:
NS1 proteincomplement systemdengueflavivirusimmune evasion

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Area of Science:

  • Virology
  • Immunology
  • Infectious Diseases

Background:

  • Flavivirus infections, including dengue and West Nile virus, are a growing global health concern, particularly in tropical and subtropical regions.
  • These viruses, transmitted by mosquitoes and ticks, cause a spectrum of illnesses ranging from mild fever to severe neurological damage and death.
  • The complement system, a crucial part of the innate immune system, has been implicated in both host protection and disease exacerbation during flavivirus infections.

Purpose of the Study:

  • To review the dual role of the complement system in flavivirus infections.
  • To emphasize the impact of complement activation and inhibition on dengue and West Nile virus pathogenesis.
  • To provide insights into potential therapeutic strategies targeting the complement system.

Main Methods:

  • Literature review of studies on flavivirus-complement interactions.
  • Analysis of research focusing on complement's role in dengue and West Nile virus pathogenesis.
  • Synthesis of findings on complement inhibition and activation pathways relevant to flavivirus infection.

Main Results:

  • The complement system exhibits complex interactions with flaviviruses, capable of both limiting viral spread and contributing to immunopathology.
  • Specific complement components and pathways are differentially involved in dengue and West Nile virus infections.
  • Modulation of complement activity presents a potential therapeutic avenue for flavivirus infections.

Conclusions:

  • The complement system is a critical modulator of flavivirus infection outcomes.
  • Understanding these interactions is vital for developing effective treatments against emerging flavivirus threats.
  • Targeting complement pathways may offer novel strategies for managing diseases caused by dengue and West Nile viruses.