title: Bioactive microarrays immobilized on low-fouling surfaces to study specific endothelial cell adhesion.
abstract: With the aim to study how to modulate the specific endothelial cell patterning and responses on biomaterials surfaces, bioactive microarrays were developed and validated for specific cell patterning. These microarrays were made of low-fouling surfaces, that prevent nonspecific cell adhesion, bearing bioactive molecules at given known locations by presenting specific ligands to cell receptors. Arrays of bioactive molecules (RGD, REDV, and SVVYGLR sequences and vascular endothelial growth factor (VEGF)) were immobilized on a carboxy-methyl-dextran low-fouling surface and were exposed to human endothelial cells and fibroblasts to screen for the effect of bioactive spot molecular composition on cell adhesion. Endothelial cells only were sensitive to RGD peptide co-immobilized with REDV or SVVYGLR sequences: they induced a reduction in cell spreading and a loss of actin stress fibers. RGD co-immobilized with VEGF also resulted in the reorganization of actin filaments and focal points in endothelial cells. Combination of RGD with these endothelial cell-selective biomolecules did not elicit a strong adhesion phenotype but rather one characteristic of migrating cells.
authors.affiliation: Laboratoire de Bioingénierie et de Biophysique de l'Université de Sherbrooke, Department of Chemical Engineering, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, Québec, Canada.
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Monchaux
authors.forename: Patrick
authors.initials: P
authors.lastname: Vermette
mesh_terms: D000199:Actins / Q000378:metabolism; D000595:Amino Acid Sequence; D002448:Cell Adhesion / Q000187:drug effects; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000166:cytology* / Q000378:metabolism; D022001:Focal Adhesions / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D046228:Microarray Analysis / Q000295:instrumentation* / Q000379:methods*; D015394:Molecular Structure; D010455:Peptides / Q000494:pharmacology; D010590:Phalloidine / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A / Q000494:pharmacology
chemical_list: D000199:Actins; D010455:Peptides; D042461:Vascular Endothelial Growth Factor A; D010590:Phalloidine