Related Experiment Video
Updated: Aug 15, 2026
Magnetic Isolation of Microglial Cells from Neonate Mouse for Primary Cell Cultures
Published on: July 25, 2022
Magnetic labeling of activated microglia in experimental gliomas
G Fleige1, C Nolte, M Synowitz
1Department of Radiology, Charité Medical School, Humboldt University of Berlin, Schumannstrasse 20/21, D-10117 Berlin, Germany. gerrit.fleige@charite.de
Abstract:
Microglia, as intrinsic immunoeffector cells of the central nervous system (CNS), play a very sensitive, crucial role in the response to almost any brain pathology where they are activated to a phagocytic state. Based on the characteristic features of activated microglia, we investigated whether these cells can be visualized with magnetic resonance imaging (MRI) using ultrasmall superparamagnetic iron oxides (USPIOs). The hypothesis of this study was that MR microglia visualization could not only reveal the extent of the tumor, but also allow for assessing the status of immunologic defense. Using USPIOs in cell culture experiments and in a rat glioma model, we showed that microglia can be labeled magnetically. Labeled microglia are detected by confocal microscopy within and around tumors in a typical border-like pattern. Quantitative in vitro studies revealed that microglia internalize amounts of USPIOs that are significantly higher than those incorporated by tumor cells and astrocytes. Labeled microglia can be detected and quantified with MRI in cell phantoms, and the extent of the tumor can be seen in glioma-bearing rats in vivo. We conclude that magnetic labeling of microglia provides a potential tool for MRI of gliomas, which reflects tumor morphology precisely. Furthermore, the results suggest that MRI may yield functional data on the immunologic reaction of the CNS.
Insights
Magnetic labeling of microglia using ultrasmall superparamagnetic iron oxides (USPIOs) enables visualization of brain tumors with MRI. This technique allows for precise tumor extent assessment and insights into the central nervous system's immune response.
Area of Science:
- Neuroscience
- Immunology
- Radiology
Background:
- Microglia are key immune cells in the central nervous system (CNS), crucial for responding to brain pathologies.
- Activated microglia exhibit phagocytic properties relevant to disease states.
- Visualizing microglia could enhance understanding of brain tumor extent and immune status.
Purpose of the Study:
- To investigate the magnetic labeling of microglia using ultrasmall superparamagnetic iron oxides (USPIOs).
- To assess the potential of MRI for visualizing USPIO-labeled microglia in glioma models.
- To determine if MRI can reflect tumor morphology and CNS immune response.
Main Methods:
- Cell culture experiments with USPIOs and microglia.
- Establishment of a rat glioma model for in vivo studies.
- Confocal microscopy for labeled microglia detection.
- In vitro and in vivo MRI using USPIO-labeled cells and tumor models.
Main Results:
- Microglia can be effectively labeled with USPIOs.
- Labeled microglia are detected within and around tumors in a distinct pattern.
- Microglia internalize significantly more USPIOs than tumor cells or astrocytes.
- MRI successfully detects and quantifies labeled microglia in phantoms and visualizes tumor extent in vivo.
Conclusions:
- Magnetic labeling of microglia with USPIOs offers a potential tool for MRI of gliomas.
- This approach provides precise visualization of tumor morphology.
- MRI may offer functional insights into the CNS immune reaction during gliomagenesis.
