title: Modulation of angiogenic functions in human macrophages by biomaterials.
abstract: We examined the ability of polyvinylchloride (PVC), polytetrafluorethylene (PTFE) and tissue culture polystyrene (TCPS) to affect angiogenic functions in human monocyte-derived macrophages by measuring the mRNA expression of genes encoding angiogenic and anti-angiogenic molecules including basic fibroblast growth factor (bFGF), vascular endothelial growth factor (VEGF), angiopoietin-1 (Ang-1) and thrombospondin-1 (Tsp-1). The angiogenic activity of the corresponding macrophage conditioned media (CM) was measured by the proliferation of endothelial cells and the sprouting of new capillaries from fragments of human placental blood vessels. We determined that bFGF was not expressed in macrophages while VEGF and Tsp-1 mRNAs were expressed constitutively. Ang-1 was expressed in macrophages cultured up to 7 days on PTFE and TCPS independent of the culture stage. In contrast, macrophages cultured on PVC did not produce detectable amounts of Ang-1 mRNA after 7 days. CM from macrophages cultured either on PTFE or TCPS stimulated angiogenesis whereas CM from macrophages cultured on PVC inhibited it. The results demonstrate that polymers can cause differential expression of the angiogenic molecule Ang-1 in macrophages. They also induce different phenotypes of macrophages, which can either stimulate or inhibit angiogenesis suggesting a material-dependent influence on neovascularization.
authors.affiliation: Interdisciplinary Center of Clinical Research Biomat., RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany. gdagtekin@ukaachen.de
authors.forename: Güngör
authors.initials: G
authors.lastname: Dagtekin
authors.forename: Ruth
authors.initials: R
authors.lastname: Schiffer
authors.forename: Birgit
authors.initials: B
authors.lastname: Klein
authors.forename: Willi
authors.initials: W
authors.lastname: Jahnen-Dechent
authors.forename: Gabriele
authors.initials: G
authors.lastname: Zwadlo-Klarwasser
mesh_terms: D042683:Angiopoietin-1 / Q000235:genetics / Q000378:metabolism; D001672:Biocompatible Materials / Q000494:pharmacology*; D002478:Cells, Cultured; D017077:Culture Media, Conditioned; D004730:Endothelium, Vascular / Q000166:cytology / Q000378:metabolism; D016222:Fibroblast Growth Factor 2 / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation; D006801:Humans; D008264:Macrophages / Q000166:cytology / Q000502:physiology*; D018919:Neovascularization, Physiologic; D010641:Phenotype; D010920:Placenta / Q000098:blood supply; D011137:Polystyrenes / Q000494:pharmacology*; D011138:Polytetrafluoroethylene / Q000378:metabolism*; D011143:Polyvinyl Chloride / Q000494:pharmacology*; D019700:Thrombospondin 1 / Q000235:genetics / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A / Q000235:genetics / Q000378:metabolism
chemical_list: D042683:Angiopoietin-1; D001672:Biocompatible Materials; D017077:Culture Media, Conditioned; D011137:Polystyrenes; D019700:Thrombospondin 1; D042461:Vascular Endothelial Growth Factor A; D016222:Fibroblast Growth Factor 2; D011138:Polytetrafluoroethylene; D011143:Polyvinyl Chloride