Abstract
Purpose
Stealth nanoparticles are generally obtained after modifying their surface with hydrophilic polymers, such as PEG. In this study, we analysed the effect of a phospholipid (DG) or protein (BSA) inclusion in porous cationic polysaccharide (NP+) on their physico-chemical structure and the effect on complement activation.
Methods
NP+s were characterised in terms of size, zeta potential (ζ) and static light scattering (SLS). Complement consumption was assessed in normal human serum (NHS) by measuring the residual haemolytic capacity of the complement system.
Results
DG loading did not change their size or ζ, whereas progressive BSA loading lightly decreased their ζ. An electrophoretic mobility analysis study showed the presence of two differently-charged sublayers at the NP+ surface which are not affected by DG loading. Complement system activation, studied via a CH50 test, was suppressed by DG or BSA loading. We also demonstrated that NP+s could be loaded by a polyanionic molecule, such as BSA, after their preliminary filling by a hydrophobic molecule, such as DG.
Conclusion
These nanoparticles are able to absorb large amounts of phospholipids or proteins without change in their size or zeta potential. Complement studies showed that stealth behaviour is observed when they are loaded and saturated either with anionic phospholipid or proteins.
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ACKNOWLEDGMENTS
We would like to thank Myriam Moreau, Christina Hubert (Inserm U646) and Pierre Legras (Animalerie Hospitalo-Universitaire,CHU, Angers, France) for technical support, as well as Dr. Alain Chevalier (Laboratoire d’Immunologie et Allergologie, Espace Centre Hospitalio-Universitaire d’Angers) for normal human serum supplies. We would like also to thank Robert Filmon and Romain Mallet from the Service Commun d’Imagerie et d’Analyses Microscopiques and Michel Terray from Malvern Instruments. A. Paillard was supported by a grant from Le comité départemental de la Ligue Contre le Cancer. This work was also supported by the Cancéropôle Grand-Ouest and by la Ligue National Contre le Cancer via Equipe Labellisée 2007 funding.
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Paillard, A., Passirani, C., Saulnier, P. et al. Positively-Charged, Porous, Polysaccharide Nanoparticles Loaded with Anionic Molecules Behave as ‘Stealth’ Cationic Nanocarriers. Pharm Res 27, 126–133 (2010). https://doi.org/10.1007/s11095-009-9986-z
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DOI: https://doi.org/10.1007/s11095-009-9986-z