title: Films of dextran-graft-polybutylmethacrylate to enhance endothelialization of materials.
abstract: We have synthesized new structures obtained from amphiphilic copolymers of dextran and polybutylmethacrylate with the aim of endothelialization of biomaterials. Grafting of butylmethacrylate onto dextran has been carried out using ceric ammonium nitrate as initiator. Three copolymers were obtained (11, 30 and 37 wt.% dextran) and homogeneous thin films were successfully prepared. In contrast to dextran, the resulting films were stable in water, and copolymers characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry and dynamic mechanical analysis showed evidence of hybrid properties between the parent homopolymers. Surfaces of films were smooth when analyzed by atomic force microscopy (roughness 2+/-1 nm) but greatly differed in their hydrophilicity by increasing the dextran content (water contact angle from 99 degrees to 57 degrees). In contrast to polybutylmethacrylate, where the proliferation of vascular smooth muscle cells (VSMCs) was excellent but that of endothelial cells was very low, the copolymer containing 11% of dextran was excellent for endothelial cells but very limited for VSMCs. An in vitro wound assay demonstrated that copolymer with 11% dextran is even more favorable for endothelial cell migration than tissue-culture polystyrene. Increasing the dextran content in the copolymers decreased the proliferation for both vascular cell types. Altogether, these results show that transparent and water-insoluble films made from copolymers of dextran and butylmethacrylate copolymers with an appropriate composition could enhance endothelial cell proliferation and migration. Therefore, a potential benefit of this approach is the availability of surfaces with tunable properties for the endothelialization of materials.
authors.affiliation: INSERM, U698, Bio-ingénierie de Polymères Cardiovasculaires, CHU X. Bichat, Université Paris Cité/Paris Diderot, 75018 Paris, France.
authors.forename: Sidi Mohamed
authors.initials: SM
authors.lastname: Derkaoui
authors.forename: Amélie
authors.initials: A
authors.lastname: Labbé
authors.forename: Agung
authors.initials: A
authors.lastname: Purnama
authors.forename: Virginie
authors.initials: V
authors.lastname: Gueguen
authors.forename: Christel
authors.initials: C
authors.lastname: Barbaud
authors.forename: Thierry
authors.initials: T
authors.lastname: Avramoglou
authors.forename: Didier
authors.initials: D
authors.lastname: Letourneur
mesh_terms: D000180:Acrylic Resins / Q000494:pharmacology*; D000327:Adsorption / Q000187:drug effects; D000818:Animals; D001672:Biocompatible Materials / Q000494:pharmacology*; D002152:Calorimetry, Differential Scanning; D002417:Cattle; D002465:Cell Movement / Q000187:drug effects; D002478:Cells, Cultured; D003911:Dextrans / Q000494:pharmacology*; D042783:Endothelial Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D004727:Endothelium / Q000187:drug effects* / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D008689:Methacrylates / Q000494:pharmacology*; D018625:Microscopy, Atomic Force; D032389:Myocytes, Smooth Muscle / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D011817:Rabbits; D012710:Serum Albumin, Bovine / Q000378:metabolism; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D000180:Acrylic Resins; D001672:Biocompatible Materials; D003911:Dextrans; D008689:Methacrylates; C553180:dextran-graft-polybutylmethacrylate; D012710:Serum Albumin, Bovine