title: Neovascularization and vascular markers in a foreign body reaction to subcutaneously implanted degradable biomaterial in mice.
abstract: To study the spatiotemporal processes of angiogenesis during a foreign body reaction (FBR), biodegradable bovine collagen type-1 (COL-I) discs were implanted in mice for a period up to 28 days. The cellular infiltration (consisting mainly of macrophages, giant cells and fibroblasts), and the extent of neovascularization into the discs were determined. Also the expression levels and/or distribution of the endothelial cell markers von Willebrand factor (vWF), platelet endothelial cell adhesion molecule-1 (PECAM-1)/CD31, MECA-32 antigens and endomucin, and of the basal lamina marker collagen type IV (Coll IV) were analysed. In time, a strong neovascularization of the discs was observed, with frequently occurring vascular sprouting, and intussusceptive growth of vessels. In this model, vWF, MECA-32 and endomucin antibodies often failed to stain neovessels in the COL-I discs. In contrast, staining for collagen IV basal lamina component in combination with CD31 covered the complete range of neo-vessels. We conclude that the model described in this study is a useful model to study FBR induced angiogenesis because of the active neovascularization taking place during prolonged periods of time.
authors.affiliation: Laboratory for Tissue Engineering, Department of Pathology and Laboratory Medicine, Medical Biology Section, Groningen University, Institute for Drug Exploration (GUIDE), Groningen, The Netherlands.
authors.forename: Machteld J
authors.initials: MJ
authors.lastname: van Amerongen
authors.forename: Grietje
authors.initials: G
authors.lastname: Molema
authors.forename: Josée
authors.initials: J
authors.lastname: Plantinga
authors.forename: Henk
authors.initials: H
authors.lastname: Moorlag
authors.forename: Marja J A
authors.initials: MJ
authors.lastname: van Luyn
mesh_terms: D020341:Absorbable Implants / Q000009:adverse effects*; D000818:Animals; D000954:Antigens, Surface / Q000032:analysis; D002417:Cattle; D024042:Collagen Type I / Q000633:toxicity*; D024141:Collagen Type IV / Q000032:analysis; D004730:Endothelium, Vascular / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D005549:Foreign-Body Reaction / Q000209:etiology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008833:Microcirculation / Q000187:drug effects / Q000473:pathology*; D009389:Neovascularization, Pathologic / Q000473:pathology*; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000032:analysis; D014841:von Willebrand Factor / Q000032:analysis
chemical_list: D000954:Antigens, Surface; D024042:Collagen Type I; D024141:Collagen Type IV; C095910:MECA-32 antigen, mouse; D019408:Platelet Endothelial Cell Adhesion Molecule-1; D014841:von Willebrand Factor