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Adsorption of Cellular Proteins to Polyelectrolyte-Functionalized Gold Nanorods: A Mechanism for Nanoparticle Regulation of Cell Phenotype?

机译:细胞蛋白对聚电解质功能化金纳米棒的吸附:细胞表型的纳米调节机制?

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摘要

Cell behavior in the presence of nanomaterials is typically explored through simple viability assays, but there is mounting evidence that nanomaterials can have more subtle effects on a variety of cellular functions. Previously our lab demonstrated that gold nanorods functionalized with polyelectrolyte multi-layers inhibited rat cardiac fibroblast-mediated remodeling of type I collagen scaffolds by altering fibroblast phenotype and the mechanical properties of the collagen network. In this work, we examine a possible mechanism for these effects: adsorption of cellular proteins by the nanorods. Mass spectrometric and gel electrophoresis of media collected from cultured cells suggests that a number of proteins, some of which mediate cell-cell and cell-matrix interactions, adsorb onto the surface of these nanoparticles in vitro. Polyethylene glycol coating of the nanorods largely mitigates protein adsorption and fibroblast-mediated collagen remodeling. These results suggest that adsorption of proteins by nanorods could have a significant effect on cell functions, including fibroblast-mediated matrix remodeling.
机译:纳米材料存在下的细胞行为通常是通过简单的活力测定来探索的,但是越来越多的证据表明,纳米材料可以对多种细胞功能产生更微妙的影响。以前,我们的实验室证明,用聚电解质多层功能化的金纳米棒可通过改变成纤维细胞表型和胶原网络的机械特性来抑制大鼠心脏成纤维细胞介导的I型胶原蛋白支架的重塑。在这项工作中,我们研究了这些作用的可能机制:纳米棒对细胞蛋白的吸附。从培养细胞中收集的培养基的质谱和凝胶电泳表明,许多蛋白质在体外吸附到这些纳米粒子的表面,其中一些介导细胞与细胞和细胞与基质的相互作用。纳米棒的聚乙二醇涂层极大地减轻了蛋白质吸附和成纤维细胞介导的胶原蛋白重塑。这些结果表明,纳米棒对蛋白质的吸附可能对细胞功能具有重要影响,包括成纤维细胞介导的基质重塑。

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