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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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Complement activation turnover on surfaces of nanoparticles.

S M Moghimi1, D Simberg2

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This summary is machine-generated.

The complement system, part of innate immunity, defends against pathogens and nanomedicines. Uncontrolled complement activation by nanoparticles poses challenges for designing safe nanomedicines.

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Adverse injection reactionsComplement systemProtein adsorptionStealth therapeutic nanoparticles

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Area of Science:

  • Immunology
  • Nanomedicine
  • Biomaterials Science

Background:

  • The complement system is a crucial component of the innate immune system, providing non-specific host defense.
  • Particulate matters, including pathogens and nanomedicines, can activate the complement system via classical, lectin, and alternative pathways.
  • While complement activation aids in clearing foreign particles, uncontrolled activation can lead to detrimental host damage.

Purpose of the Study:

  • To investigate the role of plasma protein adsorption in complement activation on nanoparticle surfaces.
  • To understand the dynamic nature of complement activation turnover in vivo.
  • To identify challenges in designing immune-safe nanomedicines due to complement activation.

Main Methods:

  • Analysis of plasma protein adsorption onto nanoparticle surfaces.
  • Investigation of complement activation pathways, particularly the alternative pathway.
  • In vivo studies to observe the continuous and changeable nature of protein-complement interactions.

Main Results:

  • Plasma proteins adsorbing to nanoparticle surfaces significantly contribute to complement activation, especially via the alternative pathway.
  • A continuous cycle of protein deposition, complement complex formation, and release occurs on nanoparticle surfaces in vivo.
  • This dynamic complement activation turnover presents a significant hurdle for nanomedicine development.

Conclusions:

  • Nanoparticle-induced complement activation is a complex, dynamic process driven by plasma protein interactions.
  • The alternative pathway is particularly implicated in complement activation on nanoparticle surfaces.
  • Addressing complement activation turnover is essential for the successful design of safe and effective nanomedicines.