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Updated: Jun 13, 2026
Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
Published on: July 14, 2021
Robust uptake of magnetic nanoparticles (MNPs) by central nervous system (CNS) microglia: implications for particle
Mark R Pickard1, Divya M Chari1
1Cellular and Neural Engineering Group, Institute for Science and Technology in Medicine, Keele University, Staffordshire, ST5 5BG, UK.
Abstract:
Magnetic nanoparticles (MNPs) are important contrast agents used to monitor a range of neuropathological processes; microglial cells significantly contribute to MNP uptake in sites of pathology. Microglial activation occurs following most CNS pathologies but it is not known if such activation alters MNP uptake, intracellular processing and toxicity. We assessed these parameters in microglial cultures with and without experimental 'activation'. Microglia showed rapid and extensive MNP uptake under basal conditions with no changes found following activation; significant microglial toxicity was observed at higher particle concentrations. Based on our findings, we suggest that avid MNP uptake by endogenous CNS microglia could significantly limit uptake by other cellular subtypes in mixed neural cell populations.
Insights
Magnetic nanoparticles (MNPs) are readily taken up by microglial cells, even when activated. High concentrations of MNPs can cause toxicity, potentially limiting their use in neural cell populations.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Nanotechnology
Background:
- Magnetic nanoparticles (MNPs) are crucial contrast agents for monitoring neuropathological processes.
- Microglial cells are key players in MNP uptake at sites of central nervous system (CNS) pathology.
- The impact of microglial activation on MNP interaction remains largely uncharacterized.
Purpose of the Study:
- To investigate how microglial activation influences MNP uptake, intracellular processing, and toxicity.
- To determine if experimentally activated microglia exhibit altered MNP handling compared to basal conditions.
- To assess the potential toxicity of MNPs in microglial cultures.
Main Methods:
- Cultured microglial cells were subjected to experimental activation.
- MNP uptake, intracellular processing, and toxicity were evaluated in both activated and non-activated microglia.
- Cellular responses were analyzed across various MNP concentrations.
Main Results:
- Microglia demonstrated rapid and extensive MNP uptake under basal conditions.
- Microglial activation did not significantly alter MNP uptake or intracellular processing.
- Significant microglial toxicity was observed at higher MNP concentrations.
Conclusions:
- Endogenous CNS microglia exhibit avid MNP uptake irrespective of activation state.
- High MNP concentrations pose a toxicity risk to microglia.
- Extensive MNP uptake by microglia may limit their availability for other cell types in mixed neural populations, impacting their utility as contrast agents.
