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  Innovative Design of Ca-Sensitive Paramagnetic Liposomes Results in an Unprecedented Increase in Longitudinal Relaxivity

Garello, F., Vibhute, S., Gündüz, S., Logothetis, N., Terreno, E., & Angelovski, G. (2016). Innovative Design of Ca-Sensitive Paramagnetic Liposomes Results in an Unprecedented Increase in Longitudinal Relaxivity. Biomacromolecules, 17(4), 1303-1311. doi:10.1021/acs.biomac.5b01668.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-79EC-F Version Permalink: http://hdl.handle.net/21.11116/0000-0000-79ED-E
Genre: Journal Article

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Garello, F, Author
Vibhute, S1, Author              
Gündüz, S2, 3, Author              
Logothetis, NK1, 2, Author              
Terreno, E, Author
Angelovski, G2, 3, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
3Research Group MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_2528691              

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 Abstract: Bioresponsive MRI contrast agents sensitive to Ca(II) fluctuations may play a critical role in development of functional molecular imaging methods to study the brain physiology or abnormalities in muscle contraction. Great challenge in their chemistry is the preparation of probes capable of inducing a strong signal variation which could be detected in a robust way. To this end, the incorporation of small molecular weight bioresponsive agents into nanocarriers can improve the overall properties in a few ways: i) the agent can be delivered into the tissue of interest, increasing the local concentration; ii) its biokinetic properties and retention time will improve; iii) the high molecular weight and size of the nanocarrier may cause additional changes in the MRI signal and raise the chances for their detection in functional experiments. In this work, we report the preparation of the new class of liposome-based, Ca-sensitive MRI agents. We synthesised a novel amphiphilic ligand which was incorporated into the liposome bilayer. A remarkable increase of ~420 in longitudinal relaxivity r1, from 7.3 mM-1s-1 to 38.1 mM-1s-1 at 25 °C and 21.5 MHz in absence and presence of Ca(II), respectively, was achieved by the most active liposomal formulation. To the best of our knowledge, this is the highest change in r1 observed for Ca-sensitive agents at physiological pH and can be explained by simultaneous Ca-triggered increase in hydration and reduction of local motion of Gd(III) complex which can be followed at low magnetic fields.

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 Dates: 2016-04
 Publication Status: Published in print
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 Identifiers: DOI: 10.1021/acs.biomac.5b01668
BibTex Citekey: GarelloVGLTA2016
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Title: Biomacromolecules
Source Genre: Journal
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Pages: - Volume / Issue: 17 (4) Sequence Number: - Start / End Page: 1303 - 1311 Identifier: -