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

Guanshu Liu, Matthew Moake, Yah El Har-El, Chris M. Long, Kannie W.Y. Chan, Amanda Cardona, Muksit Jamil, Piotr Walczak, Assaf A. Gilad, George Sgouros, Peter C.M. Van Zijl, Jeff W.M. Bulte, Michael T. McMahon

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)1106-1113
Number of pages8
JournalMagnetic resonance in medicine
Volume67
Issue number4
DOIs
StatePublished - Apr 2012

Keywords

  • CEST
  • liposome contrast agent
  • lymph node imaging
  • molecular imaging
  • multicolor MR imaging

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Fingerprint

Dive into the research topics of 'In vivo multicolor molecular MR imaging using diamagnetic chemical exchange saturation transfer liposomes'. Together they form a unique fingerprint.

Cite this