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D-mannose-modified iron oxide nanoparticles for stem cell labeling.

Daniel Horak¹, Michal Babic, Pavla Jendelová

¹Institute of Macromolecular Chemistry AS CR, Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic. horak@imc.cas.cz

Bioconjugate Chemistry

|March 21, 2007

Summary

New D-mannose-coated iron oxide nanoparticles show enhanced cell internalization and superior relaxivity for cell labeling. These magnetic nanoparticles are promising for advanced biomedical imaging applications.

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Area of Science:

Materials Science
Biotechnology
Nanotechnology

Background:

Iron oxide nanoparticles (IONPs) are crucial for biomedical applications, including cell labeling and magnetic resonance imaging (MRI).
Surface modification of IONPs is essential to improve their biocompatibility, cellular uptake, and imaging performance.
D-mannose, a monosaccharide, has shown potential in enhancing nanoparticle interactions with cells.

Purpose of the Study:

To develop and characterize D-mannose-modified iron oxide nanoparticles using two distinct coating methods.
To evaluate the effect of D-mannose modification on nanoparticle properties, protein adsorption, and cellular internalization.
To assess the MRI relaxivity of cells labeled with these modified nanoparticles.

Main Methods:

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Synthesis of IONPs via precipitation of Fe(II)/Fe(III) salts with ammonium hydroxide, employing in situ and post-synthesis D-mannose coating.

Characterization using transmission electron microscopy (TEM), atomic force microscopy (AFM), dynamic light scattering (DLS), and spectroscopy (IR, UV-vis).

Cellular labeling of rat bone marrow stromal cells (rMSCs) and assessment of internalization via microscopy and relaxivity measurements.

Main Results:

Two types of D-mannose-modified IONPs were produced, with sizes of approximately 2 nm (in situ) and 6 nm (post-synthesis).
D-mannose coating suppressed non-specific protein adsorption and enhanced cellular internalization of IONPs by rMSCs.
Post-synthesis D-mannose-coated IONPs exhibited significantly higher relaxivities in labeled cells.

Conclusions:

Surface modification with D-mannose improves the performance of iron oxide nanoparticles for cell labeling.
Post-synthesis D-mannose coating yields IONPs with superior properties for MRI contrast enhancement.
These findings highlight the potential of D-mannose-modified IONPs in advanced biomedical imaging.