title: Immunocamouflage of latex surfaces by grafted methoxypoly(ethylene glycol) (mPEG): proteomic analysis of plasma protein adsorption.
abstract: Grafting of methoxypoly(ethylene glycol) (mPEG) to cells and biomaterials is a promising non-pharmacological immunomodulation technology. However, due to the labile nature of cells, surface-plasma interactions are poorly understood; hence, a latex bead model was studied. PEGylation of beads resulted in a density and molecular weight dependent decrease in total adsorbed protein with a net reduction from (159.9±6.4) ng cm(-2) on bare latex to (18.4±0.8) and (52.3±5.3) ng cm(-2) on PEGylated beads (1 mmol L(-1) of 2 or 20 kD SCmPEG, respectively). SDS-PAGE and iTRAQ-MS analysis revealed differential compositions of the adsorbed protein layer on the PEGylated latex with a significant reduction in the compositional abundance of proteins involved in immune system activation. Thus, the biological efficacy of immunocamouflaged cells and materials is mediated by both biophysical obfuscation of antigens and reduced surface-macromolecule interactions.
authors.affiliation: Canadian Blood Services, Vancouver V6T 1Z3, Canada.
authors.forename: Yevgeniya
authors.initials: Y
authors.lastname: Le
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: DunCheng
authors.initials: D
authors.lastname: Wang
authors.forename: Mark D
authors.initials: MD
authors.lastname: Scott
mesh_terms: D000327:Adsorption; D000941:Antigens / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry; D001703:Biophysics / Q000379:methods; D001798:Blood Proteins / Q000737:chemistry*; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D006801:Humans; D007107:Immune System; D007840:Latex / Q000737:chemistry*; D013058:Mass Spectrometry / Q000379:methods; D008956:Models, Chemical; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry; D040901:Proteomics / Q000379:methods; D013499:Surface Properties
chemical_list: D000941:Antigens; D001672:Biocompatible Materials; D001798:Blood Proteins; D007840:Latex; D011108:Polymers; D011137:Polystyrenes; D011092:Polyethylene Glycols; C028210:monomethoxypolyethylene glycol