title: Adsorption of HSA, IgG and laminin-1 on model hydroxyapatite surfaces--effects of surface characteristics.
abstract: Ellipsometry and mechanically assisted sodium dodecyl sulphate elution was utilized to study the adsorption of human serum albumin (HSA), human immunoglobulin G (IgG), and laminin-1, as well as competitive adsorption from a mixture of these proteins on spin-coated and sintered hydroxyapatite (HA) surfaces, respectively. The HA surfaces were characterized with respect to wettability and roughness by means of water contact angles and atomic force microscopy, respectively. Both surface types were hydrophilic, and the average roughness (Sa) and surface enlargement (Sdr) were lower for the sintered compared to the spin-coated HA surfaces. The adsorbed amounts on the sintered HA increased as follows: HSA < laminin-1 < IgG < the protein mixture. For the competitive adsorption experiments, the adsorbed fractions increased accordingly: HSA < laminin-1 < IgG on both types of HA substratum. However, a higher relative amount of HSA and laminin-1 and a lower relative amount of IgG was found on the spin-coated surfaces compared to the sintered surfaces. The effects observed could be ascribed to differences in surface roughness and chemical composition between the two types of HA substratum, and could have an influence on selection of future implant surface coatings.
authors.affiliation: Prosthetic Dentistry, Faculty of Odontology, Malmö University, Malmö, Sweden. Ida.Svendsen@mah.se
authors.forename: Ida E
authors.initials: IE
authors.lastname: Svendsen
authors.forename: Olga
authors.initials: O
authors.lastname: Santos
authors.forename: Javier
authors.initials: J
authors.lastname: Sotres
authors.forename: Ann
authors.initials: A
authors.lastname: Wennerberg
authors.forename: Karin
authors.initials: K
authors.lastname: Breding
authors.forename: Thomas
authors.initials: T
authors.lastname: Arnebrant
authors.forename: Liselott
authors.initials: L
authors.lastname: Lindh
mesh_terms: D000327:Adsorption; D002021:Buffers; D015921:Dental Implants; D017886:Durapatite / Q000737:chemistry*; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D007074:Immunoglobulin G / Q000737:chemistry* / Q000302:isolation & purification; D007700:Kinetics; D007797:Laminin / Q000737:chemistry* / Q000302:isolation & purification / Q000493:pharmacokinetics; D018625:Microscopy, Atomic Force; D025941:Protein Interaction Mapping / Q000379:methods; D012031:Refractometry; D012709:Serum Albumin / Q000737:chemistry* / Q000302:isolation & purification / Q000493:pharmacokinetics; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D013113:Spin Labels; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D002021:Buffers; D015921:Dental Implants; D007074:Immunoglobulin G; D007797:Laminin; D012709:Serum Albumin; D013113:Spin Labels; C121346:laminin 1; D014867:Water; D012967:Sodium Dodecyl Sulfate; D017886:Durapatite; D014025:Titanium