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Capture of stealth nanoparticles by the body's defences.

Authors
  • Moghimi, S M1
  • Hunter, A C
  • 1 Molecular Targeting and Polymer Toxicology Group, School of Pharmacy and Biomolecular Sciences, University of Brighton, UK.
Type
Published Article
Journal
Critical reviews in therapeutic drug carrier systems
Publication Date
2001
Volume
18
Issue
6
Pages
527–550
Identifiers
PMID: 11789674
Source
Medline
License
Unknown

Abstract

This article highlights and discusses our experience in the design, handling, and biological evaluation of long-circulating nanoparticles based on polyoxypropylene/polyoxyethylene copolymer nonionic surfactants. A frequently observed but ignored phenomenon following intravenous injection of such polymer-modified long-circulating colloidal systems is their eventual recognition and clearance by macrophages of the reticuloendothelial system. The pharmacokinetics as well as the tissue distribution of such so-called 'stealth" nanoparticles are also altered after repeated intravenous injection in a time-dependent manner. An understanding of immunological and pathological factors that control the pharmacokinetic and biological behavior of long-circulating particles after single or repeated administration is therefore crucial for the design of a system with an optimal diagnostic and/or therapeutic performance. Therefore, we have also examined and discussed the concept of macrophage recognition of a 'stealth-like nature" and factors that initiate this cascade. A critical discussion of the future of this interesting area of nano-biotechnology/engineering is also provided.

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