title: Aptamer-modified micro/nanostructured surfaces: efficient capture of Ramos cells in serum environment.
abstract: For potential applications in the isolation and enrichment of circulating tumor cells (CTCs), we have developed gold nanoparticle layers (GNPLs) of different roughness modified with TD05 aptamers (GNPL-APT). In serum-free binary cell mixtures containing Ramos cancer cells and CEM cells, the density of Ramos cells adherent to highly rough GNPL-APT was 19 times that of CEM cells. However, in serum-containing conditions, the specificity of GNPL-APT for Ramos cells was much reduced. To improve Ramos specificity in the presence of serum, we attached the TD05 aptamer to the layers via poly(oligo(ethylene glycol) methacrylate) (POEGMA) as an antifouling spacer (GNPL-POEGMA-APT). In serum-containing environment GNPL-POEGMA-APT showed an enhanced selectivity for Ramos cells, which increased with increasing surface roughness. The results of this study indicate that surfaces combining appropriate chemical composition and micro/nano roughness structures may be useful for cell separation, including the isolation of cancer cells for diagnosis.
authors.affiliation: Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Ren'ai Road, Suzhou 215123, P. R. China.
authors.forename: Yanyun
authors.initials: Y
authors.lastname: Wang
authors.forename: Feng
authors.initials: F
authors.lastname: Zhou
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Liu
authors.forename: Lin
authors.initials: L
authors.lastname: Yuan
authors.forename: Dan
authors.initials: D
authors.lastname: Li
authors.forename: Yanwei
authors.initials: Y
authors.lastname: Wang
authors.forename: Hong
authors.initials: H
authors.lastname: Chen
mesh_terms: D052157:Aptamers, Nucleotide / Q000737:chemistry* / Q000494:pharmacology; D002448:Cell Adhesion / Q000187:drug effects; D018929:Cell Culture Techniques / Q000295:instrumentation*; D045744:Cell Line, Tumor; D002469:Cell Separation / Q000295:instrumentation* / Q000379:methods; D002470:Cell Survival / Q000187:drug effects; D017077:Culture Media, Conditioned; D016895:Culture Media, Serum-Free; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids; D013499:Surface Properties
chemical_list: D052157:Aptamers, Nucleotide; D017077:Culture Media, Conditioned; D016895:Culture Media, Serum-Free; D008689:Methacrylates; D011109:Polymethacrylic Acids; C528061:poly(poly(ethylene glycol)methacrylate); D011092:Polyethylene Glycols