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Targeting cells with MR imaging probes based on paramagnetic Gd(III) chelates

S Aime1, A Barge, C Cabella

  • 1Dipartimento di Chimica Inorganica, Chimica Fisica e Chimica dei materiali - Universita di Torino - Via Pietro Giuria 7, I-10125 Torino - Italy. silvio.aime@unito.it

Current Pharmaceutical Biotechnology
|December 8, 2004
PubMed

Insights

To enhance MRI sensitivity, researchers explored Gd(III) chelate cell internalization pathways. Strategies like pinocytosis and receptor-mediated endocytosis can achieve sufficient cell labeling for MRI visualization.

Area of Science:

  • Biomedical Imaging
  • Nanotechnology
  • Cell Biology

Background:

  • Magnetic Resonance Imaging (MRI) suffers from low sensitivity compared to Positron Emission Tomography (PET).
  • Amplification strategies are crucial for specific pathway labeling to improve MRI sensitivity.
  • Gadolinium(III) chelates are key contrast agents for MRI, but efficient cellular uptake is challenging.

Purpose of the Study:

  • To survey diverse cellular internalization routes for Gadolinium(III) chelates.
  • To identify methods for achieving high intracellular concentrations of Gd(III) chelates for MRI visualization.
  • To evaluate the potential of various cell labeling strategies for enhancing MRI sensitivity.

Main Methods:

  • Review of internalization mechanisms including pinocytosis, phagocytosis, receptor-mediated endocytosis, transporters, and carrier peptides.
  • Analysis of Gd(III) chelate entrapment efficiency via different cellular pathways.
  • Assessment of required intracellular Gd(III) chelate concentrations (10^7-10^8/cell) for MRI visualization.

Main Results:

  • Pinocytosis is effective for labeling cells with prolonged incubation and high Gd-agent concentrations, particularly stem cells.
  • Nanoparticles loaded with Gd(III) chelates efficiently label phagocytic cells.
  • Receptor-mediated endocytosis, including functionalized chelates and supramolecular systems, offers another internalization route.
  • Targeting nutrient transporters in tumor cells and utilizing penetrin-like peptides are promising strategies.

Conclusions:

  • Achieving high intracellular Gd(III) chelate concentrations (10^7-10^8/cell) is feasible through various cellular uptake pathways.
  • Pinocytosis and nanoparticle-mediated phagocytosis are effective for specific cell types.
  • Targeted delivery via transporters and peptides represents a novel approach for cell-specific MRI contrast enhancement.

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