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Updated: Jun 9, 2026
Monitoring Dendritic Cell Migration using 19F / 1H Magnetic Resonance Imaging
Published on: March 20, 2013
In vivo cellular MRI of dendritic cell migration using micrometer-sized iron oxide (MPIO) particles
Roja Rohani1, Sonali N de Chickera, Christy Willert
1Department of Medical Biophysics, University of Western Ontario, London, Ontario, Canada.
Purpose:
This study seeks to assess the use of labeling with micron-sized iron oxide (MPIO) particles for the detection and quantification of the migration of dendritic cells (DCs) using cellular magnetic resonance imaging (MRI).
Procedures:
DCs were labeled with red fluorescent MPIO particles for detection by cellular MRI and a green fluorescent membrane dye (PKH67) for histological detection. MPIO-labeled DCs or unlabeled control DCs were injected into mice footpads at two doses (0.1 × 10(6) and 1 × 10(6)). Images were acquired at 3 Tesla before DC injection and 2, 3, and 7 days post-DC injection.
Results:
Labeling DCs with MPIO particles did not affect viability, but it did alter markers of DC activation and maturation. MRI and fluorescence microscopy allowed for the detection of MPIO-labeled DCs within the draining popliteal nodes after their injection into the footpad.
Conclusions:
This paper presents the first report of the successful use of fluorescent MPIO particles to label and track DC migration.
Insights
Researchers successfully used fluorescent micron-sized iron oxide (MPIO) particles to label and track dendritic cell (DC) migration in mice using cellular magnetic resonance imaging (MRI). This method enables non-invasive monitoring of immune cell movement.
Area of Science:
- Immunology
- Biomedical Imaging
- Nanotechnology
Background:
- Dendritic cells (DCs) are crucial immune cells involved in initiating adaptive immune responses.
- Tracking DC migration is essential for understanding immune surveillance and developing effective immunotherapies.
- Current methods for tracking DCs are often invasive or lack sufficient resolution.
Purpose of the Study:
- To evaluate the efficacy of micron-sized iron oxide (MPIO) particles for labeling dendritic cells (DCs).
- To assess the use of cellular magnetic resonance imaging (MRI) for detecting and quantifying DC migration.
- To establish a novel method for in vivo tracking of immune cell trafficking.
Main Methods:
- Dendritic cells (DCs) were labeled with fluorescent MPIO particles and a membrane dye (PKH67).
- MPIO-labeled or unlabeled DCs were injected into mouse footpads at varying doses.
- Cellular MRI at 3 Tesla was performed before and at multiple time points after DC injection.
Main Results:
- MPIO labeling did not compromise DC viability but influenced activation/maturation markers.
- Both MRI and fluorescence microscopy successfully detected MPIO-labeled DCs in draining popliteal lymph nodes.
- The study demonstrated successful tracking of DC migration from the injection site to lymph nodes.
Conclusions:
- This study reports the first successful use of fluorescent MPIO particles for labeling and tracking DC migration.
- Cellular MRI provides a viable tool for non-invasively monitoring MPIO-labeled DC trafficking.
- This technique holds promise for advancing the study of immune cell dynamics and therapeutic development.
