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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...
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...
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Humoral Immune Responses

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Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

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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Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
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Published on: April 23, 2017

Variable antibody-dependent activation of complement by functionalized phospholipid nanoparticle surfaces.

Christine T N Pham1, Lynne M Mitchell, Jennifer L Huang

  • 1Divisions of Rheumatology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

The Journal of Biological Chemistry
|November 5, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed a method to predict how lipid-nanoparticles interact with the immune system. Surface chemistry, not just charge, dictates the immune response, guiding safer nanotherapeutic design.

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Area of Science:

  • Biomedical Engineering
  • Immunology
  • Materials Science

Background:

  • Nanomaterials offer promise for disease detection and treatment.
  • Lipid-encapsulated nanoparticles (NPs), including liposomes, are widely used but can trigger adverse immune reactions.
  • A systematic method is needed to predict nanomaterial interactions within biological systems.

Purpose of the Study:

  • To quantitatively assess the complement system response to lipid-encapsulated NPs functionalized with lipid-anchored gadolinium chelates.
  • To correlate in vitro findings with in vivo mouse model results.
  • To establish a basis for structure-activity relationship studies in nanotherapeutic development.

Main Methods:

  • Development of a quantitative approach to study NP-complement interactions.
  • Utilizing in vitro assays to measure complement activation.
  • Correlating in vitro data with in vivo results from a mouse model.

Main Results:

  • Surface functionalization of NPs with specific chemical structures triggers rapid complement activation via the classical pathway, initiated by natural IgM.
  • Complement activation intensity depends on the chemical structure of lipid-anchored chelates, not solely on zeta potential.
  • Complement-inhibiting proteins on the NP surface can modulate the extent of complement activation.

Conclusions:

  • Understanding NP-innate immune response interactions is crucial for developing safe nanotherapeutics.
  • Surface chemistry of NPs significantly influences complement system activation.
  • These findings provide a foundation for designing biocompatible nanotherapeutics with predictable immune responses.