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Updated: Jan 2, 2026
Using Magnetometry to Monitor Cellular Incorporation and Subsequent Biodegradation of Chemically Synthetized Iron Oxide Nanoparticles
Published on: February 27, 2021
Polyacrylic acid-coated iron oxide nanoparticles could be a useful tool for tracking inflammatory monocytes
Manuela Giraldo-Villegas1, Jeaneth Urquijo2, Oscar L Arnache-Olmos2
1Grupo de Inmunología Celular e Inmunogenética, Sede de Investigación Universitaria (SIU), Universidad de Antioquia (UDEA), Calle 70 No. 52-21, Medellín, Colombia.
Aim:
To establish the effect of poly(acrylic acid)-coated iron oxide nanoparticles (PAC-IONs) and later exposure to a magnetic field on the differentiation of mononuclear phagocytes into macrophages.
Methods:
By flow cytometry, cell death was evaluated with DIOC6 and PI, Poly (ADP-ribose) Polymerases (PARP) fragmentation, H2AX phosphorylation and TUNEL assay. Cytokines by Cytokine bead array and the intracellular amount of iron by atomic absorption spectrometry.
Results:
PAC-IONs did not induce apoptosis, modify the cell membrane integrity or alter the mitochondrial membrane potential. They did not affect the cell morphology, the pattern of cytokine accumulation or the activating role of differentiation of mononuclear phagocytes into macrophages on the proliferation of autologous T cells.
Conclusion:
This evidence indicates that the PAC-IONs are safe and biocompatible. Moreover, the selectivity of the PAC-IONs for mononuclear phagocytes, as well as their increased uptake by non-classical monocytes, warrant future research with a view to their use as a contrast agent, a useful tool for in vivo tracking of tissue-infiltrating mononuclear phagocytes.
Insights
Poly(acrylic acid)-coated iron oxide nanoparticles (PAC-IONs) are safe and biocompatible, showing no adverse effects on mononuclear phagocyte differentiation into macrophages. Their selective uptake by monocytes suggests potential for in vivo tracking applications.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Immunology
Background:
- Mononuclear phagocytes are crucial immune cells.
- Iron oxide nanoparticles (IONs) offer potential for biomedical applications.
- Poly(acrylic acid) coating enhances nanoparticle biocompatibility.
Purpose of the Study:
- To investigate the effects of poly(acrylic acid)-coated iron oxide nanoparticles (PAC-IONs) on mononuclear phagocyte differentiation.
- To assess the impact of magnetic field exposure on PAC-IONs and cell differentiation.
- To evaluate the safety and biocompatibility of PAC-IONs.
Main Methods:
- Flow cytometry was used to assess cell death markers (DIOC6, PI, PARP fragmentation, H2AX phosphorylation, TUNEL assay).
- Cytokine profiles were analyzed using a Cytokine bead array.
- Intracellular iron content was quantified via atomic absorption spectrometry.
Main Results:
- PAC-IONs did not induce apoptosis or compromise cell membrane integrity.
- Mitochondrial membrane potential and cell morphology remained unaffected.
- PAC-IONs did not alter cytokine accumulation or the macrophage differentiation's effect on T cell proliferation.
Conclusions:
- PAC-IONs demonstrate safety and biocompatibility.
- PAC-IONs exhibit selectivity for mononuclear phagocytes, particularly non-classical monocytes.
- Further research is warranted for PAC-IONs as contrast agents for in vivo tracking of immune cells.
