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Receptor-Mediated SPION Labeling of CD4+ T Cells for Longitudinal MRI Tracking of Distribution Following Systemic
Yu Ping1, Songyue Han1, Brock Howerton1
1Shu Chien Gene Lay Department of Bioengineering, University of California San Diego, San Diego, CA 92093, USA.
Nanomaterials (Basel, Switzerland)
|July 25, 2025
Summary
Researchers developed a new method using CD4-Superparamagnetic iron oxide nanoparticles (SPION) to track CD4+ T cells in vivo via MRI. This technique allows for non-invasive monitoring of cell therapies, improving diagnostic capabilities.
Area of Science:
- Biomedical Imaging
- Immunology
- Nanotechnology
Background:
- Tracking T cells in vivo using MRI is challenging due to difficulties in labeling these cells.
- Superparamagnetic iron oxide nanoparticles (SPION) are explored as potential MRI contrast agents.
Purpose of the Study:
- To investigate CD4-SPION as a specific labeling agent for CD4+ T cells for MRI tracking.
- To optimize the labeling protocol for cell viability and labeling efficacy.
Main Methods:
- CD4-SPION labeling of T cells, optimization of protocol, and assessment of cell viability and function.
- In vitro characterization using Prussian blue staining, TEM, MRI, and flow cytometry.
- In vivo tracking of labeled T cells in mice using liver MRI and histological analysis.
Main Results:
- CD4-SPION induced T2 signal attenuation, confirming its potential as an MRI contrast agent.
- CD4+ T cells successfully internalized CD4-SPION without compromising cellular functions.
- Labeled T cells were tracked in vivo in the liver for up to 72 hours post-injection.
Conclusions:
- CD4-SPION labeling combined with MRI provides a valid method for in vivo tracking of CD4+ T cells.
- This approach is safe, specific, and sensitive, with potential for clinical application in adoptive cell therapies.
