In vivo multicolor molecular MR imaging using diamagnetic chemical exchange saturation transfer liposomes

A variety of (super)paramagnetic contrast agents are available for enhanced MR visualization of specific tissues, cells, or molecules. To develop alternative contrast agents without the presence of metal ions, liposomes were developed containing simple bioorganic and biodegradable compounds that pro...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2012-04, Vol.67 (4), p.1106-1113
Main Authors: Liu, Guanshu, Moake, Matthew, Har-el, Yah-el, Long, Chris M., Chan, Kannie W.Y., Cardona, Amanda, Jamil, Muksit, Walczak, Piotr, Gilad, Assaf A., Sgouros, George, van Zijl, Peter C.M., Bulte, Jeff W.M., McMahon, Michael T.
Format: Article
Language:English
Subjects:
Animals
Cell Line, Tumor
CEST
Colorimetry - methods
Contrast Media - pharmacokinetics
liposome contrast agent
Liposomes - pharmacokinetics
lymph node imaging
Magnetic Resonance Imaging - methods
Magnetic Resonance Spectroscopy - methods
Mice
Mice, Inbred C57BL
molecular imaging
Molecular Imaging - methods
multicolor MR imaging
Neoplasms, Experimental - metabolism
Neoplasms, Experimental - pathology
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Summary:A variety of (super)paramagnetic contrast agents are available for enhanced MR visualization of specific tissues, cells, or molecules. To develop alternative contrast agents without the presence of metal ions, liposomes were developed containing simple bioorganic and biodegradable compounds that produce diamagnetic chemical exchange saturation transfer MR contrast. This diamagnetic chemical exchange saturation transfer contrast is frequency‐dependent, allowing the unique generation of “multicolor” images. The contrast can be turned on and off at will, and standard images do not show the presence of these agents. As an example, glycogen, L‐arginine, and poly‐L‐lysine were encapsulated inside liposomes and injected intradermally into mice to image the lymphatic uptake of these liposomes. Using a frequency‐dependent acquisition scheme, it is demonstrated that multicolor MRI can differentiate between different contrast particles in vivo following their homing to draining lymph nodes. Being nonmetallic and bioorganic, these diamagnetic chemical exchange saturation transfer liposomes form an attractive novel platform for multicolor imaging in vivo. Magn Reson Med, 2011. © 2011 Wiley‐Liss, Inc.
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.23100