Self-Assembled Superparamagnetic Iron Oxide Nanoclusters for Universal Cell Labeling and MRI

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Materials Science

Background:

• Superparamagnetic iron oxide (SPIO) nanoparticles are utilized in biomedical applications, particularly as contrast agents for magnetic resonance imaging (MRI) and for cell labeling.
• Developing stable and effective SPIO-based nanostructures is crucial for advancing cell tracking and diagnostic imaging.

Purpose of the Study:

• To synthesize and characterize SPIO nanoclusters stabilized with polyethylenimine (PEI) for enhanced cell labeling and MRI tracking.
• To evaluate the cellular uptake, cytotoxicity, and MRI sensitivity of the developed SPIO nanoclusters.
• To investigate the protective role of ferritin protein against SPIO nanocluster-induced cellular stress.

Main Methods:

• SPIO nanoparticles were stabilized with amphiphilic low molecular weight polyethylenimine (PEI) in an aqueous phase.
• Monodispersed SPIO nanoclusters (115.3 ± 40.23 nm) were formed with controlled clustering.
• Cellular uptake, cytotoxicity (MTS, LDH, flow cytometry), and MRI tracking were assessed in various cell types.

Main Results:

• The SPIO nanoclusters exhibited excellent cellular uptake and effective cell labeling across different cell types.
• High sensitivity MRI tracking of labeled cells was achieved.
• Negligible cytotoxicity was observed in various cell lines, indicating good biocompatibility.
• Ferritin protein was identified as playing a key role in mitigating cellular stress induced by SPIO nanoclusters.

Conclusions:

• Self-assembled SPIO nanoclusters possess favorable magnetic properties for universal cell labeling.
• These nanoclusters provide a safe and efficient platform for noninvasive MRI monitoring of labeled cells.
• The findings highlight the potential of PEI-stabilized SPIO nanoclusters as a valuable tool in biomedical imaging and cell tracking.