A high relaxivity Gd(III)DOTA-DSPE-based liposomal contrast agent for magnetic resonance imaging

S. Hak, H.M.H.F. Sanders, P. Agrawal, S. Langereis, H. Grull, H.M. Keizer, F. Arena, E. Terreno, G.J. Strijkers, K. Nicolay

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    Abstract

    The field of molecular imaging aims to visualize and quantify (patho)physiological processes at the cellular and molecular level. Sensitive and site-targeted contrast agents are employed to visualize molecular constituents of processes of interest. The principal aim of this study was to develop a magnetic resonance imaging (MRI) detectable liposome with high relaxivity and stability. To this end, Gd(III)DOTA-DSPE was synthesized and incorporated in a liposomal formulation. The resulting liposomes were extensively characterized in vitro in terms of contrast agent efficiency and structural properties. The liposomes were shown to have a high longitudinal relaxivity, which is crucial for the detection of low concentration molecular markers in molecular imaging studies. We also demonstrated that Gd(III)DOTA-DSPE exhibits no detectable transmetallation upon incubation with Zn(II). This is important as it significantly contributes to the biocompatibility of the contrast agent. The present liposome preparation will serve as versatile and well characterized platform for molecular imaging and targeted drug delivery studies. © 2008 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)397-404
    JournalEuropean Journal of Pharmaceutics and Biopharmaceutics
    Volume72
    Issue number2
    DOIs
    Publication statusPublished - 2009

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