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Complement System01:27

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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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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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Depletion of Specific Cell Populations by Complement Depletion
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Regulation of the Complement System by Pentraxins.

Karita Haapasalo1, Seppo Meri1,2,3

  • 1Department of Bacteriology and Immunology and Translational Immunology Research Program, University of Helsinki, Helsinki, Finland.

Frontiers in Immunology
|August 21, 2019
PubMed
Summary

Pentraxins, like C-reactive protein (CRP), regulate inflammation and infection by interacting with the complement system. They activate complement initially but then inhibit it to prevent excessive damage, a key interaction for disease.

Keywords:
CRP–C-reactive proteinPTX3age-related macular degeneration (AMD)cholesterolcomplement C1qcomplement factor Hfactor H-related proteininnate

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Area of Science:

  • Immunology
  • Biochemistry
  • Molecular Biology

Background:

  • Pentraxins (CRP, SAP, PTX3) manage tissue repair, infection defense, and inflammation with the complement system.
  • Pentraxins exhibit a dual role in complement: initial activation via C1q binding and subsequent inhibition at the C3b stage.

Purpose of the Study:

  • To review the interactions between factor H (FH) family proteins and their binding pentraxins.
  • To discuss the role of these interactions in various human diseases.

Main Methods:

  • Literature review of studies on pentraxin-complement interactions.
  • Analysis of the functional consequences of FH-pentraxin binding.

Main Results:

  • Pentraxins bind complement inhibitors C4bp (SAP) and FH (CRP, PTX3).
  • FH binding to pentraxins promotes opsonophagocytosis and inhibits complement activation pathways, preventing C5a and MAC formation.
  • CRP monitoring offers clinical insights into infection severity and type.

Conclusions:

  • The interplay between pentraxins and the complement system, particularly FH, is crucial for immune homeostasis.
  • Dysregulation of these interactions contributes to the pathogenesis of several human diseases.