Mesenchymal Stem Cell Preparation and Transfection-free Ferumoxytol Labeling for MRI Cell Tracking

Area of Science:

• Biomedical Engineering
• Cell Biology
• Medical Imaging

Background:

• Mesenchymal stem cells (MSCs) are crucial for cell therapies.
• In vivo tracking of MSCs using superparamagnetic iron-oxide (SPIO) particles via MRI enhances therapy accuracy.
• Current Ferumoxytol labeling of MSCs requires transfection agents, potentially altering cell properties.

Purpose of the Study:

• To develop a novel "bio-mimicry" protocol for labeling MSCs with Ferumoxytol.
• To eliminate the need for transfection agents or electroporation in MSC labeling.
• To prepare MSCs that retain more native characteristics for improved biomedical applications.

Main Methods:

• A "bio-mimicry" protocol was employed to culture MSCs in an environment mimicking in vivo conditions.
• This approach restored and enhanced the phagocytic activity of cultured MSCs.
• MSCs were labeled with Ferumoxytol without transfection agents, and their size was reduced.

Main Results:

• Expanded MSCs were successfully labeled with Ferumoxytol without transfection agents or electroporation.
• The bio-mimicry protocol restored MSCs' native phagocytic activity.
• MSC size was reduced from 32.0 μm to 19.5 μm, closer to native size.

Conclusions:

• The developed protocol yields MSCs with restored native properties, suitable for biomedical applications.
• This method enables effective Ferumoxytol labeling for improved MSC-tracking studies via MRI.
• The "bio-mimicry" approach offers a safer and more effective way to prepare MSCs for cell therapy.