Transmission Near-Field Scanning Optical Microscopy Investigation on Cellular Uptake Behavior of Iron Oxide Nanoparticles
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Cellular uptake behavior of iron oxide nanoparticles is investigated using a transmission near-field scanning optical microscopy (NSOM) without the need of fluorescent labeling. By using the transmission NSOM system, we could simultaneously explore the near-field optical analysis of the cell interior and record the topographic information of the cell surface. The cell endocytosis of iron oxide nanoparticles by normal breast MCF10A cells is first studied by this transmission NSOM system, and this dual functional nanoscale-resolution microscopy shows the capability of mapping the spatial localization of nanoparticles in/outside cell surface without the need of fluorescence labeling. Nanoscale optical signature patterns for iron oxide nanoparticle-loaded vesicles inside the cells were observed and analyzed.
KeywordsAFM NSOM Iron oxide Nanoparticle Endocytosis MCF10A
We gratefully acknowledge the Center of Excellence of Nanotechnology for Treatment, Understanding, and Monitoring of Cancer (NANOTUMOR) for providing financial support for this project. Mr. Stephen McDaniel in the Central Facility for Advanced Microscopy and Microanalysis (CFAMM) at the University of California is gratefully acknowledged for assistance in preparing the microtome cell slides for TEM.
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