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Microscopy imaging methods for the detection of silver and titanium nanoparticles within cells
Robert Martin Zucker1, Kaitlin Marie Daniel
1Toxicology Assessment Division, Office of Research and Development, National Health and Environmental Effects Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC, USA. zucker.robert@epa.gov
Methods in Molecular Biology (Clifton, N.J.)
|July 14, 2012
Summary
Detecting nanoparticles in cells is crucial for environmental safety. This study shows dark field microscopy effectively images titanium dioxide nanoparticles in ARPE-19 cells, aiding cellular health assessment.
Area of Science:
- Nanotechnology
- Cell Biology
- Microscopy
Background:
- Assessing environmental hazards of nanomaterials requires effective detection of cell-associated nanoparticles.
- Current methods for nanoparticle detection in cells are often suboptimal, hindering research.
Purpose of the Study:
- To optimize imaging techniques for detecting titanium dioxide (TiO2) nanoparticles within ARPE-19 cells.
- To evaluate various light microscopy modalities for nanoparticle visualization and cellular health assessment.
Main Methods:
- Utilized an E-800 Nikon microscope with a xenon light source and specialized dark field objectives.
- Fixed ARPE-19 cells in situ or in suspension for microscopic examination.
- Employed fluorescence, dark field, phase, interference, and confocal microscopy.
Main Results:
- Successfully imaged TiO2 nanoparticles in ARPE-19 cells across multiple microscopy modalities.
- Detected as few as 5-10 TiO2 nanoparticles per cell at low concentrations (0.1-0.3 μg/mL) via intense light scattering.
- Demonstrated that dark field microscopy effectively monitors nanoparticle uptake and cellular health.
Conclusions:
- Optimized optical and lighting conditions enable effective imaging of nanoparticles in cells.
- Dark field microscopy is a viable technique for monitoring nanoparticle uptake and assessing cellular health.
- Wide-field microscopy offers a practical approach for nanoparticle detection in cellular studies.
