STAR BURST Dendrimers (D), and superparamagnetic iron oxide nanoparticles (SPIO) are being developed as magnetic labels for in vivo cellular imaging. By combining commonly used transfection agents (TA) that have high net electrostatic charges with macromolecular high generation (G) dendrimers (G =5, 7, 9, 10) were conjugated to DOTA and Gadolinium (III) ion or SPIO, effectively altering (by shielding water molecules) from interacting with the contrast agents nuclear magnetic resonance relaxation properties were detected. The physical chemical properties of the TA- SPIO molecules have been modeled and characterized and used to predict the electrostatic interaction between TA and the contrast agents and therefore the combination as a novel method for chaperoning contrast agents into endosomes in cells. Biodistribution studies of magnetically labeled human mesenchymal stem cells in rats demonstrated that labeled cells could be detected using a 1.5 Tesla clinical MR unit in the livers for up to 14 days following an intravenous infusion of 900,000 cells. Biochemical and molecular biological analysis of TA-SPIO labeled stem cells indicates that cell labeling did not effect proliferation or viability of the stem cells nor the cells ability to terminally differentiate under appropriate conditions. Using a similar magnetical labeling approach, enchephalotigenic T-cells were injected into recepient mice and experimental allergic encephalomyelitis was induced in these animals. Labeled T-cells could be detected in the spinal cords of EAE mice at time of initial neurological event using MR microscopy at 7 Tesla. Immmunohistochemical analysis revealed that TA-SPIO labeled T-cells had similar proliferation assays and cytokine profiles as unlabeled encephalotigenic T-cells. In addition, there was excellent correlation between MR microscopy and histology of spinal cords in clinically affected animals. Further studies are planned to determine if the trafficking of magnetically labeled stem cells or genetically altered cells can be detected by MRI and whether these cells will localize to, repair, repopulate or treat central nervous system diseases.

Agency
National Institute of Health (NIH)
Institute
Clinical Center (CLC)
Type
Intramural Research (Z01)
Project #
1Z01CL090004-09
Application #
6663626
Study Section
(LDRR)
Project Start
Project End
Budget Start
Budget End
Support Year
9
Fiscal Year
2002
Total Cost
Indirect Cost
Name
Clinical Center
Department
Type
DUNS #
City
State
Country
United States
Zip Code
Liepold, Lars; Anderson, Stasia; Willits, Deborah et al. (2007) Viral capsids as MRI contrast agents. Magn Reson Med 58:871-9
Arbab, Ali S; Liu, Wei; Frank, Joseph A (2006) Cellular magnetic resonance imaging: current status and future prospects. Expert Rev Med Devices 3:427-39
Arbab, Ali S; Pandit, Sunil D; Anderson, Stasia A et al. (2006) Magnetic resonance imaging and confocal microscopy studies of magnetically labeled endothelial progenitor cells trafficking to sites of tumor angiogenesis. Stem Cells 24:671-8
Pawelczyk, Edyta; Arbab, Ali S; Pandit, Sunil et al. (2006) Expression of transferrin receptor and ferritin following ferumoxides-protamine sulfate labeling of cells: implications for cellular magnetic resonance imaging. NMR Biomed 19:581-92
Anderson, Stasia A; Lee, Kristen Kyongae; Frank, Joseph A (2006) Gadolinium-fullerenol as a paramagnetic contrast agent for cellular imaging. Invest Radiol 41:332-8
Muldoon, L L; Tratnyek, P G; Jacobs, P M et al. (2006) Imaging and nanomedicine for diagnosis and therapy in the central nervous system: report of the eleventh annual Blood-Brain Barrier Disruption Consortium meeting. AJNR Am J Neuroradiol 27:715-21
Allen, Mark; Bulte, Jeff W M; Liepold, Lars et al. (2005) Paramagnetic viral nanoparticles as potential high-relaxivity magnetic resonance contrast agents. Magn Reson Med 54:807-12
Yocum, Gene T; Wilson, Lindsey B; Ashari, Parwana et al. (2005) Effect of human stem cells labeled with ferumoxides-poly-L-lysine on hematologic and biochemical measurements in rats. Radiology 235:547-52
Anderson, Stasia A; Glod, John; Arbab, Ali S et al. (2005) Noninvasive MR imaging of magnetically labeled stem cells to directly identify neovasculature in a glioma model. Blood 105:420-5
Arbab, Ali S; Yocum, Gene T; Rad, Ali M et al. (2005) Labeling of cells with ferumoxides-protamine sulfate complexes does not inhibit function or differentiation capacity of hematopoietic or mesenchymal stem cells. NMR Biomed 18:553-9

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