Related Experiment Video
Updated: Jun 10, 2026
08:26
Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles
Published on: October 19, 2015
Gene delivery in three-dimensional cell cultures by superparamagnetic nanoparticles
Haiyuan Zhang1, Moo-Yeal Lee, Michael G Hogg
1Department of Chemical and Biological Engineering and Center for Biotechnology and Interdisciplinary Science, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.
ACS Nano
|August 25, 2010
Summary
Superparamagnetic nanoparticles effectively deliver nucleic acids into 3D cell cultures, overcoming mass transfer limits. This method enables efficient gene silencing and screening of therapeutic or toxic interfering RNA (iRNA) effects in complex cellular models.
Area of Science:
- Biotechnology
- Drug Discovery
- Cellular Biology
Background:
- Three-dimensional (3D) cell cultures mimic in vivo environments for drug screening.
- Mass transfer limitations hinder the delivery of large molecules like nucleic acids in 3D cultures.
- Nucleic acids are crucial for therapeutics and modulating gene expression.
Purpose of the Study:
- To develop a method for delivering nucleic acids into 3D cell cultures using magnetic nanoparticles.
- To assess the efficiency of this delivery system for transfection and gene silencing.
- To evaluate the utility of this approach for screening interfering RNA (iRNA) toxicity in 3D models.
Main Methods:
- Polyethylenimine (PEI)-coated superparamagnetic nanoparticles (SPMNs) were engineered.
- SPMNs were used to deliver siRNA and green fluorescent protein (GFP) plasmids into 3D collagen-gel cell cultures.
- An external magnetic field drove the delivery process.
- GFP expression was silenced using shRNA delivered by SPMNs.
- Toxic shRNA plasmids were delivered to assess cellular toxicity.
Main Results:
- High transfection efficiencies were achieved: 64% for siRNA and 77% for GFP plasmids.
- Delivery of shRNA against GFP resulted in 82% silencing of GFP expression.
- Significant toxicities (41-51% cell death) were observed upon delivery of known toxic shRNA plasmids.
Conclusions:
- PEI-coated SPMNs provide an efficient magnetic field-driven method for nucleic acid delivery in 3D cell cultures.
- This approach overcomes mass transfer limitations inherent in 3D culture systems.
- The system is suitable for screening the therapeutic or toxic effects of interfering RNA constructs in complex 3D cellular models.
