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Preparation of Nanoparticles for ToF-SIMS and XPS Analysis
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Intracellular nanoparticle coating stability determines nanoparticle diagnostics efficacy and cell functionality.

Stefaan J H Soenen1, Uwe Himmelreich, Nele Nuytten

  • 1Subfaculty of Medicine, Katholieke Universiteit Leuven - IRC, KUL-Campus Kortrijk, Lab BioNanoColloids, E. Sabbelaan 53, 8500 Kortrijk, Belgium.

Small (Weinheim an Der Bergstrasse, Germany)
|September 7, 2010
PubMed
Summary
This summary is machine-generated.

Iron oxide nanoparticles (NPs) used as MRI contrast agents can degrade in cells, losing their effectiveness. Lipid-coated NPs are more stable, enhancing MRI contrast and cell function.

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In Situ Detection and Single Cell Quantification of Metal Oxide Nanoparticles Using Nuclear Microprobe Analysis
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In Situ Detection and Single Cell Quantification of Metal Oxide Nanoparticles Using Nuclear Microprobe Analysis

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Biophysics

Background:

  • Iron oxide nanoparticles (NPs) are widely used as contrast agents in magnetic resonance (MR) imaging.
  • High intracellular concentrations of NPs are crucial for effective MR signal alteration.
  • The long-term toxicity and applicability of iron oxide NPs require further investigation.

Purpose of the Study:

  • To investigate the impact of NP coating stability on intracellular degradation and MR contrast.
  • To evaluate the effect of iron release on cellular functionality.
  • To determine how NP clustering influences their MR properties and persistence.

Main Methods:

  • Comparing the endosomal localization and degradation of various iron oxide NPs.
  • Assessing MR contrast changes correlated with NP degradation.
  • Analyzing the generation of reactive species due to iron release.
  • Evaluating the stability and clustering of lipid-coated NPs.

Main Results:

  • Endosomal localization leads to iron oxide NP degradation and reduced MR contrast.
  • NP degradation rate is primarily determined by coating stability.
  • Released ferric iron generates reactive species, impairing cell functionality.
  • Lipid-coated NPs show enhanced stability, intracellular clustering, improved MR properties, and greater persistence.

Conclusions:

  • The coating's stability is critical for iron oxide NP performance as MR contrast agents.
  • Unstable coatings lead to rapid degradation, loss of MR contrast, and cellular dysfunction.
  • Stable, lipid-coated NPs offer superior MR contrast enhancement and intracellular persistence, supporting their use in functional in vivo studies.