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• W2053155134 abstract "A new concept for modular biosurface engineering of titanium implants based on the self-assembly of complementary oligonucleotides was biochemically investigated and optimized. This study describes the synthesis and characterization (RP-HPLC and Sakaguchi assay) of oligodeoxyribonucleotide (ODN) conjugates of the hexapeptide GRGDSP containing the RGD sequence as the recognition motif for cellular adhesion receptors (integrins). The peptide was chosen exemplarily as a model molecule, because it is a simple but potent bioactive molecule and relatively well investigated. The conjugation products must fulfill two main requirements: (I) the ability to hybridize and (II) the preservation of biological activity of the RGD peptide for the enhancement of osteoblast adhesion. In the following text, the term hybridization is generally used for Watson-Crick base pairing. The ability of the conjugates to hybridize to surface-immobilized complementary ODN was verified by competitive hybridization with radiolabeled ((32)P) complementary strands and by hybridization experiments using a quartz crystal microbalance (QCM). Surface hybridization was further characterized using different adsorption isotherms (e.g., Freundlich and Frumkin types), since the type of isotherm and the derived thermodynamic parameters may reveal characteristic differences between ODN and conjugates thereof. Biological activity of the conjugates was examined in vitro with osteoblasts. The cells were either cultured directly on the ODN-GRGDSP modified titanium implants or used for competition adhesion studies with dissolved ODN-GRGDSP conjugates. All results support the successful establishment of the new surface modification system. Hybridization of RGD peptide-modified nucleic acids to ODN-modified titanium implant materials is thus a promising method for osteoblast attachment in a modular and self-organizing system on implant surfaces." @default.
• W2053155134 created "2016-06-24" @default.
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• W2053155134 date "2009-03-13" @default.
• W2053155134 modified "2023-10-08" @default.
• W2053155134 title "Oligonucleotide−RGD Peptide Conjugates for Surface Modification of Titanium Implants and Improvement of Osteoblast Adhesion" @default.
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• W2053155134 doi "https://doi.org/10.1021/bc800372e" @default.
• W2053155134 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19368342" @default.
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