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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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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
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Special Features of Adaptive Immunity01:20

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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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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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Complement as a regulator of adaptive immunity.

Justin Killick1, Gregoire Morisse1,2, Dirk Sieger2

  • 1MRC Centre for Inflammation Research, Edinburgh Centre for MS Research, University of Edinburgh, Queen's Medical Research Institute, Edinburgh, EH16 4TJ, UK.

Seminars in Immunopathology
|August 27, 2017
PubMed
Summary
This summary is machine-generated.

The complement system, a key part of innate immunity, significantly influences adaptive immunity by regulating antigen-presenting cells and activating B and T lymphocytes. Its dysregulation is linked to human diseases.

Keywords:
Adaptive immunityB cellsCD46ComplementInflammationT cells

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Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • The complement system, comprising over 50 proteins, is traditionally viewed as part of the innate immune system.
  • Emerging evidence highlights its critical role in modulating adaptive immune responses.

Purpose of the Study:

  • To review the role of complement molecules in regulating antigen-presenting cells.
  • To examine the direct effects of complement on B and T lymphocyte activation.
  • To discuss the implications of complement in adaptive immunity and human diseases.

Main Methods:

  • Literature review focusing on recent studies.
  • Analysis of complement's interactions with antigen-presenting cells.
  • Examination of complement's direct effects on lymphocytes.

Main Results:

  • Complement molecules regulate antigen-presenting cells, influencing adaptive immunity.
  • Complement directly impacts the activation of B and T lymphocytes.
  • Local complement production and activation are crucial for effector responses.

Conclusions:

  • The complement system plays a vital role in adaptive immunity, extending beyond its innate immune functions.
  • Dysregulation of complement pathways is implicated in various human diseases.
  • Further research into complement's role in adaptive immunity is warranted.