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Related Concept Videos

Complement System01:27

Complement System

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 membrane...
Antigen Processing Pathways01:31

Antigen Processing Pathways

MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
Antibody Actions01:26

Antibody Actions

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...
Antimicrobial Proteins01:23

Antimicrobial Proteins

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

Defense Against Bacterial Pathogens

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...
Immune Surveillance by NK Cells and Phagocytes01:25

Immune Surveillance by NK Cells and Phagocytes

Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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NK cells are large granular lymphocytes found in the blood and lymphatic system. These...

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Identification of Post-translational Modifications of Plant Protein Complexes
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Published on: February 22, 2014

Target pattern recognition by complement proteins of the classical and alternative pathways.

Yu-Hoi Kang1, Lee Aun Tan, Maria V Carroll

  • 1MRC Immunochemistry Unit, Department of Biochemistry, University of Oxford, Oxford, UK.

Advances in Experimental Medicine and Biology
|October 6, 2009
PubMed
Summary
This summary is machine-generated.

The complement system defends animals from microbes and clears damaged cells. This study details C1q, the recognition protein of the complement classical pathway, comparing it to the alternative pathway.

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Area of Science:

  • Immunology
  • Innate Immunity

Background:

  • The complement system is crucial for innate defense against pathogens.
  • It also plays a role in clearing damaged host cells and macromolecules.
  • Three distinct pathways activate the complement system using different recognition molecules.

Purpose of the Study:

  • To describe the recognition protein C1q of the complement classical pathway.
  • To compare C1q with the recognition mechanisms of the complement alternative pathway.

Main Methods:

  • Detailed description of C1q structure and function.
  • Comparative analysis of C1q and alternative pathway recognition molecules.

Main Results:

  • C1q is the primary recognition protein for the classical complement pathway.
  • Key differences and similarities between C1q and alternative pathway activators were identified.

Conclusions:

  • Understanding C1q is essential for comprehending classical pathway activation.
  • Comparative insights enhance knowledge of the overall complement system's innate immune functions.