Encapsulation of Paramagnetic Chelates in Perfluorocarbon-loaded Fractal Nanoparticles Enables Modulation of Fluorine-19 and Proton Magnetic Resonance Imaging Signal - Université de Reims Champagne-Ardenne Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2022

Encapsulation of Paramagnetic Chelates in Perfluorocarbon-loaded Fractal Nanoparticles Enables Modulation of Fluorine-19 and Proton Magnetic Resonance Imaging Signal

Margot Verbeelen
  • Fonction : Auteur
Paul White
  • Fonction : Auteur
Alexander H.J. Staal
  • Fonction : Auteur
Edyta Swider-Cios
  • Fonction : Auteur
Kimberly R.G. Cortenbach
  • Fonction : Auteur
N. Koen van Riessen
  • Fonction : Auteur
Mangala Srinivas
  • Fonction : Auteur
Olga Koshkina

Résumé

19F magnetic resonance imaging (19F MRI) is an emerging technique for quantitative imaging of novel therapies, such as cellular therapies and theranostic nanocarriers. A modification of perfluorocarbon (PFC)-loaded, nanocarrier-based 19F MRI probes with paramagnetic chelates can enhance probe’s functionality. Liquid PFC-loaded nanocarriers typically have a core-shell structure with PFC in the core due to the poor miscibility of PFC. However, paramagnetic relaxation enhancement acts only at a distance of a few angstroms. Thus, efficient modulation of 19F signal is possible only with fluorophilic PFC-soluble chelates. Such chelates, however, cannot interact with the surroundings of nanocarriers. Conversely, chelates on the surface typically affect only the aqueous environment but not the 19F signal. We show that the confinement of PFC in biodegradable polymeric nanoparticles with fractal structure enables modulation of longitudinal and transverse 19F relaxation, as well as proton signal, using non-fluorophilic paramagnetic chelates. We compared nanoparticles with fractal multicore versus conventional core-shell structure, where the PFC is encapsulated in the core(s) and the chelate in the surrounding polymeric matrix. Importantly, paramagnetic chelates affected both longitudinal and transverse 19F relaxation in fractal multicore nanoparticles, but not in core-shell nanocapsules. Both relaxation rates of 19F nucleus increased with an increasing concentration of the paramagnetic chelate. Moreover, as the polymeric matrix remained water-permeable, proton enhancement additionally was observed in MRI. In the future, the effects of fractal confinement could be combined with more effective paramagnetic chelates to develop multifunctional imaging probes, for example, for high-sensitivity 19F MRI combined with sensing.

Domaines

Chimie

Dates et versions

hal-03523480 , version 1 (12-01-2022)

Identifiants

Citer

Margot Verbeelen, Paul White, Alexander H.J. Staal, Edyta Swider-Cios, Kimberly R.G. Cortenbach, et al.. Encapsulation of Paramagnetic Chelates in Perfluorocarbon-loaded Fractal Nanoparticles Enables Modulation of Fluorine-19 and Proton Magnetic Resonance Imaging Signal. 2022. ⟨hal-03523480⟩
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