title: The role of osteopontin in foreign body giant cell formation.
abstract: Foreign body giant cells (FBGCs) are a hallmark of the foreign body reaction caused by biomaterial implantation and are thought to contribute to biomaterial degradation and the duration of the response. Osteopontin (OPN) is a secreted, acidic matricellular protein with multiple phosphorylation sites that is highly expressed at sites of inflammation. OPN wildtype and knockout mice were implanted with poly(vinyl alcohol) sponges and explanted at 14 days. OPN knockout mice had more foreign body giant cells but fewer macrophages surrounding the implants than their wildtype counterparts. In an in vitro human FBGC assay, addition of soluble OPN was found to reduce macrophage fusion to giant cells. These are the first studies to show a direct inhibitory role of OPN in FBGC formation in response to implantation.
authors.affiliation: Department of Bioengineering, University of Washington, Box 351720, Seattle, WA 98195, USA.
authors.forename: Annabel T
authors.initials: AT
authors.lastname: Tsai
authors.forename: Julie
authors.initials: J
authors.lastname: Rice
authors.forename: Marta
authors.initials: M
authors.lastname: Scatena
authors.forename: Lucy
authors.initials: L
authors.lastname: Liaw
authors.forename: Buddy D
authors.initials: BD
authors.lastname: Ratner
authors.forename: Cecilia M
authors.initials: CM
authors.lastname: Giachelli
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D002448:Cell Adhesion; D005549:Foreign-Body Reaction; D015743:Giant Cells, Foreign-Body / Q000378:metabolism / Q000502:physiology*; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000378:metabolism; D006579:Heterozygote; D006801:Humans; D007150:Immunohistochemistry; D007249:Inflammation; D008264:Macrophages / Q000166:cytology / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D008822:Mice, Transgenic; D053495:Osteopontin; D010766:Phosphorylation; D011140:Polyurethanes; D019736:Prostheses and Implants; D011485:Protein Binding; D020033:Protein Isoforms; D011994:Recombinant Proteins / Q000737:chemistry; D012795:Sialoglycoproteins / Q000235:genetics* / Q000378:metabolism / Q000502:physiology*; D013499:Surface Properties; D013997:Time Factors
chemical_list: D001672:Biocompatible Materials; D011140:Polyurethanes; D020033:Protein Isoforms; D011994:Recombinant Proteins; C506895:SPP1 protein, human; D012795:Sialoglycoproteins; C506896:Spp1 protein, mouse; D053495:Osteopontin; D016178:Granulocyte-Macrophage Colony-Stimulating Factor