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

Mark McIntosh,'s picture
PubMed URL: 
http://www.ncbi.nlm.nih.gov/pubmed/22392814
Author: 
McMahon MT
Author List: 
Liu G
Moake M
Har-el YE
Long CM
Chan KW
Cardona A
Jamil M
Walczak P
Gilad AA
Sgouros G
van Zijl PC
Bulte JW
McMahon MT
Journal: 
Magn Reson Med
PubMed ID: 
22392814
Pagination: 
1106-13
Volume: 
67
Issue: 
4
Abstract: 
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.
Published Date: 
April, 2012

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