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Mapping the subcellular localization of Fe3O4@TiO2 nanoparticles by X-ray Fluorescence Microscopy
Y Yuan1, S Chen2, S C Gleber2
1Department of Radiation Oncology, Northwestern University, Chicago, IL 60611, USA.
Abstract:
The targeted delivery of Fe3O4@TiO2 nanoparticles to cancer cells is an important step in their development as nanomedicines. We have synthesized nanoparticles that can bind the Epidermal Growth Factor Receptor, a cell surface protein that is overexpressed in many epithelial type cancers. In order to study the subcellular distribution of these nanoparticles, we have utilized the sub-micron resolution of X-ray Fluorescence Microscopy to map the locationof Fe3O4@TiO2 NPs and other trace metal elements within HeLa cervical cancer cells. Here we demonstrate how the higher resolution of the newly installed Bionanoprobe at the Advanced Photon Source at Argonne National Laboratory can greatly improve our ability to distinguish intracellular nanoparticles and their spatial relationship with subcellular compartments.
Insights
We developed targeted iron oxide-titanium dioxide nanoparticles (Fe3O4@TiO2 NPs) for cancer nanomedicine. Higher resolution imaging revealed their precise location within cancer cells, improving nanomedicine development.
Area of Science:
- Nanomedicine
- Biomedical Imaging
- Materials Science
Background:
- Targeted delivery of nanoparticles (NPs) is crucial for nanomedicine efficacy.
- Epidermal Growth Factor Receptor (EGFR) is overexpressed in many epithelial cancers, making it a target for cancer therapy.
- Understanding the subcellular distribution of NPs is essential for optimizing nanomedicine design.
Purpose of the Study:
- To synthesize Fe3O4@TiO2 NPs capable of binding EGFR for targeted cancer cell delivery.
- To investigate the subcellular localization of these NPs within HeLa cervical cancer cells.
- To evaluate the utility of the Bionanoprobe at the Advanced Photon Source for high-resolution intracellular NP imaging.
Main Methods:
- Synthesis of Fe3O4@TiO2 NPs functionalized for EGFR binding.
- Utilizing X-ray Fluorescence Microscopy (XFM) for elemental mapping.
- Employing the high-resolution Bionanoprobe at the Advanced Photon Source for subcellular analysis.
Main Results:
- Fe3O4@TiO2 NPs were successfully synthesized and shown to bind EGFR.
- XFM enabled mapping of NP distribution and trace elements within HeLa cells.
- The Bionanoprobe provided enhanced resolution for distinguishing intracellular NPs and their subcellular relationships.
Conclusions:
- High-resolution XFM with the Bionanoprobe significantly improves the ability to track targeted nanoparticles within cancer cells.
- This technique aids in understanding nanoparticle-cell interactions for advanced nanomedicine development.
- Fe3O4@TiO2 NPs show potential for targeted cancer therapy, with imaging guiding further optimization.
