Evaluation of In-Situ Magnetic Signals from Iron Oxide Nanoparticle-Labeled PC12 Cells by Atomic Force Microscopy.

Evaluation of In-Situ Magnetic Signals from Iron Oxide Nanoparticle-Labeled PC12 Cells by Atomic Force Microscopy.
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通过原子力显微镜评估氧化铁纳米颗粒标记的 PC12 细胞的原位磁信号

DOI:
10.1166/jbn.2015.2040
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发表时间:
2015
影响因子:
2.9
通讯作者:
Cuschieri A
Cuschieri A
中科院分区:
工程技术3区
文献类型:
--
作者:
Wang L;Wang Z;Riggio C;Calatayud MP;Pinkernelle J;Raffa V;Goya GF;Keilhoff G;Cuschieri A

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磁性纳米颗粒标记的PC12细胞的磁信号通过磁力显微镜进行评估,通过部署一个局部的外部磁场磁化的纳米颗粒和磁性尖端同时,使尖端和PC12细胞相关的Fe3O4纳米颗粒之间的相互作用可以检测到在提升高度(尖端和样品之间的距离)大于100 nm。在探头的光栅扫描期间使用大的提升高度消除了来自复杂和粗糙的单元表面的非磁性干扰,并且仍然保持了足够的磁性检测灵敏度。通过分析由悬臂梁振荡的相移产生的三维重建后的细胞表面粗糙度,半定量细胞结合的纳米颗粒的磁信号。所获得的数据可用于评估整体细胞磁化强度以及磁性纳米颗粒标记细胞的最大磁力,这对于这些纳米材料的生物医学应用至关重要。
The magnetic signals from magnetite nanoparticle-labeled PC12 cells were assessed by magnetic force microscopy by deploying a localized external magnetic field to magnetize the nanoparticles and the magnetic tip simultaneously so that the interaction between the tip and PC12 cell-associated Fe3O4 nanoparticles could be detected at lift heights (the distance between the tip and the sample) larger than 100 nm. The use of large lift heights during the raster scanning of the probe eliminates the non-magnetic interference from the complex and rugged cell surface and yet maintains the sufficient sensitivity for magnetic detection. The magnetic signals of the cell-bound nanoparticles were semi-quantified by analyzing cell surface roughness upon three-dimensional reconstruction generated by the phase shift of the cantilever oscillation. The obtained data can be used for the evaluation of the overall cellular magnetization as well as the maximum magnetic forces from magnetic nanoparticle-labeled cells which is crucial for the biomedical application of these nanomaterials.
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