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In Vitro Uptake/Imaging Mouse macrophage cells (RAW264) were incubated with ferumoxytol (Feridex), ferumoxtran-10 (Combidex), or graphite/metal core-shell nanocrystals (CN) for 24 hours, each at a concentration of 100 ugFe/ml. After incubation, 5 × 106 cells from each group were scanned by MRI at 1.5 T (GE Healthcare, Milwaukee, WI) to examine cellular uptake of contrast using a standard gradient echo sequence (TR/TE = 100/10, FA = 30, Matrix = 256 × 256, slice thickness = 2.0, FOV = 12 cm). In Vivo Uptake/Imaging FVB mice (N = 5) underwent a carotid-ligation procedure previously shown to produce a macrophage-rich atherosclerotic lesion. Briefly, they were given high fat diet for 4 weeks and then had diabetes induced by 5 daily intraperitoneal injections of streptozotocin. After 2 weeks of diabetes, carotid ligation of the left carotid artery was performed. Two weeks post carotid ligation, mice were given CN-Cy5.5 (8 nmol of Cy5.5) via tail vein and scanned serially over 12–48 hours using the Maestro invivo fluorescent imaging system (CRI, Woburn, MA). After final in vivo imaging, carotid arteries were exposed and both in situ and ex vivo imaging were performed.

2105 Graphite/metal core-shell nanocrystals as MRI contrast agents to detect vascular inflammation