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Effect of PEO surface density on long-circulating PLA-PEO nanoparticles which are very low complement activators
M Vittaz1, D Bazile, G Spenlehauer
1Laboratoire de Physico-Chimie, Pharmacotechnie, Biopharmacie, CNRS URA 1218, Université Paris-Sud, Chatenay-Malabry, France.
Biomaterials
|August 1, 1996
Summary
Nanoparticle uptake by the mononuclear phagocytes system (MPS) limits blood circulation time. Poly(ethylene oxide) (PEO) surface density on nanoparticles influences complement activation, a key factor in phagocytosis.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Immunology
Background:
- Rapid uptake by the mononuclear phagocytes system (MPS) hinders nanoparticle circulation.
- Poly(lactic acid) nanoparticles with surfactants (PLA-F68) are quickly phagocytosed.
- Diblock copolymer nanoparticles (PLA-PEO) show reduced phagocytosis.
Purpose of the Study:
- To investigate the role of the complement system in nanoparticle phagocytosis.
- To understand how PEO surface density affects complement activation and MPS uptake.
- To optimize nanoparticle design for prolonged blood circulation.
Main Methods:
- Comparing phagocytosis rates of PLA-F68 and PLA-PEO nanoparticles.
- Measuring complement consumption in the presence of different nanoparticles.
- Varying PEO surface density on PLA-PEO nanoparticles to assess its impact.
Main Results:
- PLA-F68 nanoparticles caused rapid complement consumption.
- PLA-PEO nanoparticles with high PEO density showed minimal complement consumption.
- Decreasing PEO density below a threshold led to significant complement consumption.
- Complement activation correlated with MPS phagocytosis rates.
Conclusions:
- PEO surface density is critical for steric repulsion of proteins, reducing complement opsonization.
- Complement activation by opsonins significantly influences MPS phagocytosis.
- Controlling PEO surface density is key for designing nanoparticles with extended blood circulation times.