title: Influence of polysaccharide coating on the interactions of nanoparticles with biological systems.
abstract: Since dextran (DEX) grafted with poly(epsilon-caprolacton) (PCL) side chains (PCL-DEX) copolymers could form nanoparticles with a well defined core-shell structure, we investigated the ability of the DEX coating to modify the interactions with the biological media. We first studied the influence of the DEX coating on the phagocytosis of the nanoparticles by human TPH-1 and J774 murine macrophage-like cell lines. Then, the activation of the complement system (CH50 measurement) at the surface of the particles and the adsorption of plasma proteins (2D-PAGE) were investigated, too. It was found that the modification of the surface with DEX significantly reduced the cytotoxicity towards J774 macrophages: the IC50 was increased from 10 to 600 microg/ml. However, the DEX coating could activate complement, probably due to a loop-like conformation of DEX similar to that of cross-linked DEX in Sephadex (a strong complement activator). In addition, depending on whether the DEX loops were large or compact, preferential adsorption, apolipoproteins or immunoglobulins, was observed.
authors.affiliation: Faculté de Pharmacie, School of Pharmacy, Université Paris Sud, UMR CNRS 8612, tour D5, 5 Rue JB Clément, 92926 Châtenay Malabry, France.
authors.forename: Caroline
authors.initials: C
authors.lastname: Lemarchand
authors.forename: Ruxandra
authors.initials: R
authors.lastname: Gref
authors.forename: Catherine
authors.initials: C
authors.lastname: Passirani
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Garcion
authors.forename: Boris
authors.initials: B
authors.lastname: Petri
authors.forename: Rainer
authors.initials: R
authors.lastname: Müller
authors.forename: Dominique
authors.initials: D
authors.lastname: Costantini
authors.forename: Patrick
authors.initials: P
authors.lastname: Couvreur
mesh_terms: D000327:Adsorption; D000818:Animals; D002460:Cell Line; D049109:Cell Proliferation; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003167:Complement Activation; D003165:Complement System Proteins; D003911:Dextrans / Q000737:chemistry; D015180:Electrophoresis, Gel, Two-Dimensional; D006801:Humans; D020128:Inhibitory Concentration 50; D008264:Macrophages / Q000737:chemistry / Q000378:metabolism; D051379:Mice; D018613:Microscopy, Confocal; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology; D010587:Phagocytosis; D011091:Polyesters / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D020099:Coated Materials, Biocompatible; D003911:Dextrans; D011091:Polyesters; D011108:Polymers; D011134:Polysaccharides; D011092:Polyethylene Glycols; C062968:lactide-caprolactone copolymer; D003165:Complement System Proteins