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Labeling Stem Cells with Ferumoxytol, an FDA-Approved Iron Oxide Nanoparticle
Published on: November 4, 2011
Optimization of magnetosonoporation for stem cell labeling
Daohai Xie1, Bensheng Qiu, Piotr Walczak
1Image-Guided Bio-Molecular Interventions Section, Department of Radiology, University of Washington School of Medicine, Seattle, WA 98195, USA.
NMR in Biomedicine
|March 10, 2010
Summary
Magnetosonoporation (MSP) optimizes magnetic cell labeling for MRI. This technique enhances neural stem cell viability and contrast agent uptake, enabling effective tracking in vivo.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Radiology
Background:
- Magnetic cell labeling is crucial for tracking cells using Magnetic Resonance Imaging (MRI).
- Magnetosonoporation (MSP) is a novel technique combining magnetic fields and ultrasound for cell labeling.
- Optimizing MSP is essential for high cell viability and efficient contrast agent uptake.
Purpose of the Study:
- To optimize the magnetosonoporation (MSP) protocol for magnetic cell labeling.
- To achieve high cell viability and efficient intracellular uptake of MR contrast agents.
- To validate the use of MSP-labeled cells for in vivo tracking using MRI.
Main Methods:
- Determined sub-optimal MSP parameters (intensity, duty cycle, exposure time) using C17.2 neural stem cells.
- Optimized parameters by evaluating cell viability and Feridex (iron-based contrast agent) uptake.
- Validated the optimized protocol for labeling cells and tracking their migration in mouse brains via MRI and histology.
Main Results:
- Optimal MSP parameters identified: 20% duty cycle, 0.3 w/cm(2) ultrasound intensity, 5-min exposure, and 1 mg/mL Feridex.
- Achieved >90% cell viability with efficient intracellular iron uptake.
- Successfully tracked migration of Feridex-labeled neural stem cells to glioma masses in mouse brains using MRI.
Conclusions:
- The optimized MSP protocol significantly enhances cell viability and MR contrast agent uptake.
- MSP is a promising technique for MRI-guided cell therapy, facilitating clinical translation.
- This method enables effective in vivo tracking of labeled cells, crucial for therapeutic monitoring.
