title: Endothelization and adherence of leucocytes to nanostructured surfaces.
abstract: We analyse the leucocyte and endothelial cell response to polybromostyrene-polystyrene (PS/PBrS) and the poly-n-butylmethacrylate-polystyrene (PnBMA/PS) systems, both in flat form or nanostructured surfaces consisting of nanohills with increasing hill height (13-95nm). Experiments were carried out first with blood leucocytes alone, endothelial cells (of three different types) alone, and finally, using blood cells and endothelized nanosurfaces. Blocking monoclonal antibodies specific for CD11, CD29, CD31, CD54, CD166 were used to analyse whether and to what extent adhesion molecules could be involved in the adherence of both blood leucocytes and endothelial cells to different nanosurfaces. Expression of CD29 (beta-1 integrin), CD54 (ICAM-1) and CD166 (ALCAM) on blood leucocytes was dependent on the hill height, being most prominent with 13nm (PS/PBrS) and 45nm hill (PnBMA/PS) nanosurfaces. Adherence of a human microvascular endothelial cell line and umbilical primary endothelial cells was also related to hill height, being most prominent with 13nm hill height. An indirect correlation was observed between the extent of endothelization and the degree of leucocyte adherence. In cases of low to medium extent of endothelization, the adherence of monocytes and granulocytes was mediated by the expression of CD166, CD29 and CD11a (alpha-L integrin), CD29, CD31 (PECAM-1), respectively. Scanning electron microscopy studies showed the predominant emission of pseudopodia at the holes of the surfaces and the focal contacts with the nanosurfaces. Our studies emphasize the relevance of testing functional properties in co-culture experiments in the development and optimization of nanosurfaces for biomedical application.
authors.affiliation: Department of Internal Medicine, University of Turin and Centro Ricerca Medicina Sperimentale (CeRMS), Corso AM Dogliotti 14, 10126 Torino, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Buttiglieri
authors.forename: D
authors.initials: D
authors.lastname: Pasqui
authors.forename: M
authors.initials: M
authors.lastname: Migliori
authors.forename: H
authors.initials: H
authors.lastname: Johnstone
authors.forename: S
authors.initials: S
authors.lastname: Affrossman
authors.forename: L
authors.initials: L
authors.lastname: Sereni
authors.forename: M L
authors.initials: ML
authors.lastname: Wratten
authors.forename: R
authors.initials: R
authors.lastname: Barbucci
authors.forename: C
authors.initials: C
authors.lastname: Tetta
authors.forename: G
authors.initials: G
authors.lastname: Camussi
mesh_terms: D002448:Cell Adhesion / Q000502:physiology; D002478:Cells, Cultured; D003460:Crystallization / Q000379:methods; D004730:Endothelium, Vascular / Q000166:cytology* / Q000502:physiology* / Q000648:ultrastructure; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000166:cytology* / Q000502:physiology* / Q000648:ultrastructure; D008422:Materials Testing; D036103:Nanotechnology / Q000379:methods*; D011137:Polystyrenes; D014471:Umbilical Veins / Q000166:cytology / Q000502:physiology
chemical_list: D011137:Polystyrenes