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• W1998761473 abstract "Abstract Polystyrene surfaces grafted with a nonfouling interfacial interpenetrating polymer network (IPN) of poly(acrylamide‐ co ‐ethylene glycol/acrylic acid) [p(AAm‐ co ‐EG/AAc)] were modified with several peptide ligands adapted from bone sialoprotein (BSP). IPNs were modified with both single ligands and ligand blends to study the correlation between a simple metric, ligand–receptor adhesion strength, and the extent of matrix mineralization for osteoblast like cells (rat calvarial osteoblasts). The ligands studied included RGD cell‐binding [CGGNGEP RGD TYRAY (l‐RGD), CGGEP RGD TYRA (s2‐RGD), CGP RGD TYG (lc‐RGD), cyclic(CGP RGD TYG) (c‐RGD), and CGGP RGD T (s‐RGD)], heparin binding (CGGFH RRIK A), and collagen binding (CGG DGEA G) peptides, with the appropriate controls. Adhesion strength scaled with ligand density (1–20 pmol/cm 2 ) and was dependent on ligand type with the following trend: l‐RGD > s2‐RGD ≈ c‐RGD >> s‐RGD ≈ lc‐RGD >>> FHRRIKA ≈ DGEA. Independent of ligand density, % matrix mineralization varied with ligand type resulting in the following trend: lc‐RGD > s2‐RGD > l‐RGD ≈ c‐RGD >> s‐RGD >>> FHRRIKA. The Tyr (Y) residue immediately following the RGD cell‐binding domain proved to be critical for stable cell proliferation and mineralization, since removal of this residue resulted in erratic cell attachment and mineralization behavior. The minimum BSP sequence necessary for strong adhesion and extensive mineralization was CGGEPRGDTYRA; the minimal sequence suitable for extensive mineralization but lacking strong adhesion was CGPRGDTYG. The cyclic peptide (c‐RGD) had much greater adhesion strength compared to its linear counterpart (lc‐RGD). The calculated characteristic adhesion strength ( F 70 ) obtained using a centrifuge adhesion assay proved to be a poor metric for predicting % mineralized area; however, in general, surfaces possessing a F 70 > 100 g promoted extensive matrix mineralization. Percent mineralization and number of mineralized nodules scaled with number of cells seeded suggesting a critical dependence on the initial number of osteoprogenitors in culture. This study demonstrates matrix mineralization dependence on ligand type, ligand density, and adhesion strength. The high‐throughput character of these surfaces allowed efficient investigation of multiple ligands at multiple densities providing an excellent tool for studying ligand–receptor interactions under normal cell culture conditions with serum present. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res, 2005" @default.
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• W1998761473 date "2005-08-24" @default.
• W1998761473 modified "2023-10-13" @default.
• W1998761473 title "The effect of ligand type and density on osteoblast adhesion, proliferation, and matrix mineralization" @default.
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• W1998761473 doi "https://doi.org/10.1002/jbm.a.30482" @default.
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