Abstract
The physical and chemical parameters involved in the design and synthesis of biospecifically targeted nanoparticulate contrast media for magnetic resonance molecular imaging (MRMI) were explored in this pilot investigation. Latex nanoparticles 100, 400 and 900 nm in diameter were doubly derivatised, first with tomato lectin and then with gadoliniumIII-diethylenetriamine pentaacetic acid (Gd-chelates) to target them to epithelial and endothelial glycocalyceal N-glycans and to generate contrast enhancement in magnetic resonance imaging (MRI). After intravenous injection into mice, human placental cotyledons or human Vena saphena magna, contrasty images of the vascular structures were obtained in 1.5 T MRI with spatial resolution 0.1 mm in the imaging plane and 0.6 mm in the z axis, persisting >60 min and resistant to washing out by buffer rinses. Ultrastructural analysis of the nanoparticles revealed the targeting groups at the nanoparticle surfaces and the distribution of the Gd-chelates within the nanoparticles and enabled counts for use in determining relaxivity. The relaxivity values revealed were extremely high, accounting for the strong MR signals observed. Occasionally, nanoparticles larger than 100 nm were seen in close spatial association with disrupted regions of cell membrane or of collagen fibrils in the extracellular matrix. The data suggest that 100-nm nanoparticles generate adequate contrast for MRMI and cause least disruption to endothelial cell surfaces.
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Acknowledgements
The Austrian National Bank supported all stages of this work through the Jubilee Fund, projects 9273 and 10844. The Medical Research Fund Tirol provided financial support to this work. The Faustus Forschung Translational Drug Development AG provided financial support to this work. The Austrian Nano-Initiative co-financed this work as part of the Nano-Health project (no. 0200), the sub-project NANO-MRI being financed by the Austrian FWF (Fonds zur Förderung der Wissenschaftlichen Forschung) (Project no. N210-NAN). Dr. A. Wilder and Dr. T. Hanitz (Analytical Systems GmbH, Oberhausen, Germany) provided significant logistical support and insights concerning photon correlation spectroscopy. We thank Silvia Fill, Angelika Flörl and Beate Schimpfössl for excellent technical assistance. Our analyses of the various types of images would not have been possible without the excellent supporting services provided by Dr. J. Stöckler and Dr. W. Morscher of the Central Informatics Service of the University of Innsbruck.
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Paschkunova-Martic, I., Kremser, C., Mistlberger, K. et al. Design, synthesis, physical and chemical characterisation, and biological interactions of lectin-targeted latex nanoparticles bearing Gd–DTPA chelates: an exploration of magnetic resonance molecular imaging (MRMI). Histochem Cell Biol 123, 283–301 (2005). https://doi.org/10.1007/s00418-005-0780-7
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DOI: https://doi.org/10.1007/s00418-005-0780-7